ljx

vm_arm64.dasc (106724B)

---

 |// Low-level VM code for ARM64 CPUs.
 |// Bytecode interpreter, fast functions and helper functions.
 |// Copyright (C) 2005-2016 Mike Pall. See Copyright Notice in luajit.h
 |
 |.arch arm64
 |.section code_op, code_sub
 |
 |.actionlist build_actionlist
 |.globals GLOB_
 |.globalnames globnames
 |.externnames extnames
 |
 |// Note: The ragged indentation of the instructions is intentional.
 |//       The starting columns indicate data dependencies.
 |
 |//-----------------------------------------------------------------------
 |
 |// ARM64 registers and the AAPCS64 ABI 1.0 at a glance:
 |//
 |// x0-x17 temp, x19-x28 callee-saved, x29 fp, x30 lr
 |// x18 is reserved on most platforms. Don't use it, save it or restore it.
 |// x31 doesn't exist. Register number 31 either means xzr/wzr (zero) or sp,
 |// depending on the instruction.
 |// v0-v7 temp, v8-v15 callee-saved (only d8-d15 preserved), v16-v31 temp
 |//
 |// x0-x7/v0-v7 hold parameters and results.
 |
 |// Fixed register assignments for the interpreter.
 |
 |// The following must be C callee-save.
 |.define BASE,		x19	// Base of current Lua stack frame.
 |.define KBASE,		x20	// Constants of current Lua function.
 |.define PC,		x21	// Next PC.
 |.define GLREG,		x22	// Global state.
 |.define LREG,		x23	// Register holding lua_State (also in SAVE_L).
 |.define TISNUM,	x24	// Constant LJ_TISNUM << 47.
 |.define TISNUMhi,	x25	// Constant LJ_TISNUM << 15.
 |.define TISNIL,	x26	// Constant -1LL.
 |.define fp,		x29	// Yes, we have to maintain a frame pointer.
 |
 |.define ST_INTERP,	w26	// Constant -1.
 |
 |// The following temporaries are not saved across C calls, except for RA/RC.
 |.define RA,		x27
 |.define RC,		x28
 |.define RB,		x17
 |.define RAw,		w27
 |.define RCw,		w28
 |.define RBw,		w17
 |.define INS,		x16
 |.define INSw,		w16
 |.define ITYPE,		x15
 |.define TMP0,		x8
 |.define TMP1,		x9
 |.define TMP2,		x10
 |.define TMP3,		x11
 |.define TMP0w,		w8
 |.define TMP1w,		w9
 |.define TMP2w,		w10
 |.define TMP3w,		w11
 |
 |// Calling conventions. Also used as temporaries.
 |.define CARG1,		x0
 |.define CARG2,		x1
 |.define CARG3,		x2
 |.define CARG4,		x3
 |.define CARG5,		x4
 |.define CARG1w,	w0
 |.define CARG2w,	w1
 |.define CARG3w,	w2
 |.define CARG4w,	w3
 |.define CARG5w,	w4
 |
 |.define FARG1,		d0
 |.define FARG2,		d1
 |
 |.define CRET1,		x0
 |.define CRET1w,	w0
 |
 |// Stack layout while in interpreter. Must match with lj_frame.h.
 |
 |.define CFRAME_SPACE,	208
 |//----- 16 byte aligned, <-- sp entering interpreter
 |// Unused		[sp, #204]	// 32 bit values
 |.define SAVE_NRES,	[sp, #200]
 |.define SAVE_ERRF,	[sp, #196]
 |.define SAVE_MULTRES,	[sp, #192]
 |.define TMPD,		[sp, #184]	// 64 bit values
 |.define SAVE_L,	[sp, #176]
 |.define SAVE_PC,	[sp, #168]
 |.define SAVE_CFRAME,	[sp, #160]
 |.define SAVE_FPR_,	96		// 96+8*8: 64 bit FPR saves
 |.define SAVE_GPR_,	16		// 16+10*8: 64 bit GPR saves
 |.define SAVE_LR,	[sp, #8]
 |.define SAVE_FP,	[sp]
 |//----- 16 byte aligned, <-- sp while in interpreter.
 |
 |.define TMPDofs,	#184
 |
 |.macro save_, gpr1, gpr2, fpr1, fpr2
 |  stp d..fpr1, d..fpr2, [sp, # SAVE_FPR_+(fpr1-8)*8]
 |  stp x..gpr1, x..gpr2, [sp, # SAVE_GPR_+(gpr1-19)*8]
 |.endmacro
 |.macro rest_, gpr1, gpr2, fpr1, fpr2
 |  ldp d..fpr1, d..fpr2, [sp, # SAVE_FPR_+(fpr1-8)*8]
 |  ldp x..gpr1, x..gpr2, [sp, # SAVE_GPR_+(gpr1-19)*8]
 |.endmacro
 |
 |.macro saveregs
 |  stp fp, lr, [sp, #-CFRAME_SPACE]!
 |  add fp, sp, #0
 |  stp x19, x20, [sp, # SAVE_GPR_]
 |  save_ 21, 22, 8, 9
 |  save_ 23, 24, 10, 11
 |  save_ 25, 26, 12, 13
 |  save_ 27, 28, 14, 15
 |.endmacro
 |.macro restoreregs
 |  ldp x19, x20, [sp, # SAVE_GPR_]
 |  rest_ 21, 22, 8, 9
 |  rest_ 23, 24, 10, 11
 |  rest_ 25, 26, 12, 13
 |  rest_ 27, 28, 14, 15
 |  ldp fp, lr, [sp], # CFRAME_SPACE
 |.endmacro
 |
 |// Type definitions. Some of these are only used for documentation.
 |.type L,		lua_State,	LREG
 |.type GL,		global_State,	GLREG
 |.type TVALUE,		TValue
 |.type GCOBJ,		GCobj
 |.type STR,		GCstr
 |.type TAB,		GCtab
 |.type LFUNC,		GCfuncL
 |.type CFUNC,		GCfuncC
 |.type PROTO,		GCproto
 |.type UPVAL,		GCupval
 |.type NODE,		Node
 |.type NARGS8,		int
 |.type TRACE,		GCtrace
 |.type SBUF,		SBuf
 |
 |//-----------------------------------------------------------------------
 |
 |// Trap for not-yet-implemented parts.
 |.macro NYI; brk; .endmacro
 |
 |//-----------------------------------------------------------------------
 |
 |// Access to frame relative to BASE.
 |.define FRAME_FUNC,	#-16
 |.define FRAME_PC,	#-8
 |
 |.macro decode_RA, dst, ins; ubfx dst, ins, #8, #8; .endmacro
 |.macro decode_RB, dst, ins; ubfx dst, ins, #24, #8; .endmacro
 |.macro decode_RC, dst, ins; ubfx dst, ins, #16, #8; .endmacro
 |.macro decode_RD, dst, ins; ubfx dst, ins, #16, #16; .endmacro
 |.macro decode_RC8RD, dst, src; ubfiz dst, src, #3, #8; .endmacro
 |
 |// Instruction decode+dispatch.
 |.macro ins_NEXT
 |  ldr INSw, [PC], #4
 |  add TMP1, GL, INS, uxtb #3
 |   decode_RA RA, INS
 |  ldr TMP0, [TMP1, #GG_G2DISP]
 |   decode_RD RC, INS
 |  br TMP0
 |.endmacro
 |
 |// Instruction footer.
 |.if 1
 |  // Replicated dispatch. Less unpredictable branches, but higher I-Cache use.
 |  .define ins_next, ins_NEXT
 |  .define ins_next_, ins_NEXT
 |.else
 |  // Common dispatch. Lower I-Cache use, only one (very) unpredictable branch.
 |  // Affects only certain kinds of benchmarks (and only with -j off).
 |  .macro ins_next
 |    b ->ins_next
 |  .endmacro
 |  .macro ins_next_
 |  ->ins_next:
 |    ins_NEXT
 |  .endmacro
 |.endif
 |
 |// Call decode and dispatch.
 |.macro ins_callt
 |  // BASE = new base, CARG3 = LFUNC/CFUNC, RC = nargs*8, FRAME_PC(BASE) = PC
 |  ldr PC, LFUNC:CARG3->pc
 |  ldr INSw, [PC], #4
 |  add TMP1, GL, INS, uxtb #3
 |   decode_RA RA, INS
 |  ldr TMP0, [TMP1, #GG_G2DISP]
 |   add RA, BASE, RA, lsl #3
 |  br TMP0
 |.endmacro
 |
 |.macro ins_call
 |  // BASE = new base, CARG3 = LFUNC/CFUNC, RC = nargs*8, PC = caller PC
 |  str PC, [BASE, FRAME_PC]
 |  ins_callt
 |.endmacro
 |
 |//-----------------------------------------------------------------------
 |
 |// Macros to check the TValue type and extract the GCobj. Branch on failure.
 |.macro checktp, reg, tp, target
 |  asr ITYPE, reg, #47
 |  cmn ITYPE, #-tp
 |   and reg, reg, #LJ_GCVMASK
 |  bne target
 |.endmacro
 |.macro checktp, dst, reg, tp, target
 |  asr ITYPE, reg, #47
 |  cmn ITYPE, #-tp
 |   and dst, reg, #LJ_GCVMASK
 |  bne target
 |.endmacro
 |.macro checkstr, reg, target; checktp reg, LJ_TSTR, target; .endmacro
 |.macro checktab, reg, target; checktp reg, LJ_TTAB, target; .endmacro
 |.macro checkfunc, reg, target; checktp reg, LJ_TFUNC, target; .endmacro
 |.macro checkint, reg, target
 |  cmp TISNUMhi, reg, lsr #32
 |  bne target
 |.endmacro
 |.macro checknum, reg, target
 |  cmp TISNUMhi, reg, lsr #32
 |  bls target
 |.endmacro
 |.macro checknumber, reg, target
 |  cmp TISNUMhi, reg, lsr #32
 |  blo target
 |.endmacro
 |
 |.macro mov_false, reg; movn reg, #0x8000, lsl #32; .endmacro
 |.macro mov_true, reg; movn reg, #0x0001, lsl #48; .endmacro
 |
 #define GL_J(field)	(GG_OFS(J) + (int)offsetof(jit_State, field))
 |
 #define PC2PROTO(field)  ((int)offsetof(GCproto, field)-(int)sizeof(GCproto))
 |
 |.macro hotcheck, delta
 |  NYI
 |.endmacro
 |
 |.macro hotloop
 |  hotcheck HOTCOUNT_LOOP
 |  blo ->vm_hotloop
 |.endmacro
 |
 |.macro hotcall
 |  hotcheck HOTCOUNT_CALL
 |  blo ->vm_hotcall
 |.endmacro
 |
 |// Set current VM state.
 |.macro mv_vmstate, reg, st; movn reg, #LJ_VMST_..st; .endmacro
 |.macro st_vmstate, reg; str reg, GL->vmstate; .endmacro
 |
 |// Move table write barrier back. Overwrites mark and tmp.
 |.macro barrierback, tab, mark, tmp
 |  ldr tmp, GL->gc.grayagain
 |   and mark, mark, #~LJ_GC_BLACK	// black2gray(tab)
 |  str tab, GL->gc.grayagain
 |   strb mark, tab->marked
 |  str tmp, tab->gclist
 |.endmacro
 |
 |//-----------------------------------------------------------------------
 
 #if !LJ_DUALNUM
 #error "Only dual-number mode supported for ARM64 target"
 #endif
 
 /* Generate subroutines used by opcodes and other parts of the VM. */
 /* The .code_sub section should be last to help static branch prediction. */
 static void build_subroutines(BuildCtx *ctx)
 {
   |.code_sub
   |
   |//-----------------------------------------------------------------------
   |//-- Return handling ----------------------------------------------------
   |//-----------------------------------------------------------------------
   |
   |->vm_returnp:
   |  // See vm_return. Also: RB = previous base.
   |  tbz PC, #2, ->cont_dispatch	// (PC & FRAME_P) == 0?
   |
   |  // Return from pcall or xpcall fast func.
   |  ldr PC, [RB, FRAME_PC]		// Fetch PC of previous frame.
   |   mov_true TMP0
   |  mov BASE, RB
   |  // Prepending may overwrite the pcall frame, so do it at the end.
   |   str TMP0, [RA, #-8]!		// Prepend true to results.
   |
   |->vm_returnc:
   |  adds RC, RC, #8			// RC = (nresults+1)*8.
   |  mov CRET1, #LUA_YIELD
   |  beq ->vm_unwind_c_eh
   |  str RCw, SAVE_MULTRES
   |  ands CARG1, PC, #FRAME_TYPE
   |  beq ->BC_RET_Z			// Handle regular return to Lua.
   |
   |->vm_return:
   |  // BASE = base, RA = resultptr, RC/MULTRES = (nresults+1)*8, PC = return
   |  // CARG1 = PC & FRAME_TYPE
   |  and RB, PC, #~FRAME_TYPEP
   |   cmp CARG1, #FRAME_C
   |  sub RB, BASE, RB			// RB = previous base.
   |   bne ->vm_returnp
   |
   |  str RB, L->base
   |   ldrsw CARG2, SAVE_NRES		// CARG2 = nresults+1.
   |    mv_vmstate TMP0w, C
   |   sub BASE, BASE, #16
   |  subs TMP2, RC, #8
   |    st_vmstate TMP0w
   |  beq >2
   |1:
   |  subs TMP2, TMP2, #8
   |   ldr TMP0, [RA], #8
   |   str TMP0, [BASE], #8
   |  bne <1
   |2:
   |  cmp RC, CARG2, lsl #3		// More/less results wanted?
   |  bne >6
   |3:
   |  str BASE, L->top			// Store new top.
   |
   |->vm_leave_cp:
   |  ldr RC, SAVE_CFRAME		// Restore previous C frame.
   |   mov CRET1, #0			// Ok return status for vm_pcall.
   |  str RC, L->cframe
   |
   |->vm_leave_unw:
   |  restoreregs
   |  ret
   |
   |6:
   |  bgt >7				// Less results wanted?
   |  // More results wanted. Check stack size and fill up results with nil.
   |  ldr CARG3, L->maxstack
   |  cmp BASE, CARG3
   |  bhs >8
   |   str TISNIL, [BASE], #8
   |  add RC, RC, #8
   |  b <2
   |
   |7:  // Less results wanted.
   |  cbz CARG2, <3			// LUA_MULTRET+1 case?
   |  sub CARG1, RC, CARG2, lsl #3
   |  sub BASE, BASE, CARG1		// Shrink top.
   |  b <3
   |
   |8:  // Corner case: need to grow stack for filling up results.
   |  // This can happen if:
   |  // - A C function grows the stack (a lot).
   |  // - The GC shrinks the stack in between.
   |  // - A return back from a lua_call() with (high) nresults adjustment.
   |  str BASE, L->top			// Save current top held in BASE (yes).
   |  mov CARG1, L
   |  bl extern lj_state_growstack	// (lua_State *L, int n)
   |  ldr BASE, L->top			// Need the (realloced) L->top in BASE.
   |  ldrsw CARG2, SAVE_NRES
   |  b <2
   |
   |->vm_unwind_c:			// Unwind C stack, return from vm_pcall.
   |  // (void *cframe, int errcode)
   |  mov sp, CARG1
   |  mov CRET1, CARG2
   |->vm_unwind_c_eh:			// Landing pad for external unwinder.
   |  ldr L, SAVE_L
   |   mv_vmstate TMP0w, C
   |  ldr GL, L->glref
   |   st_vmstate TMP0w
   |  b ->vm_leave_unw
   |
   |->vm_unwind_ff:			// Unwind C stack, return from ff pcall.
   |  // (void *cframe)
   |  and sp, CARG1, #CFRAME_RAWMASK
   |->vm_unwind_ff_eh:			// Landing pad for external unwinder.
   |  ldr L, SAVE_L
   |    movz TISNUM, #(LJ_TISNUM>>1)&0xffff, lsl #48
   |    movz TISNUMhi, #(LJ_TISNUM>>1)&0xffff, lsl #16
   |    movn TISNIL, #0
   |    mov RC, #16			// 2 results: false + error message.
   |  ldr BASE, L->base
   |   ldr GL, L->glref			// Setup pointer to global state.
   |    mov_false TMP0
   |  sub RA, BASE, #8			// Results start at BASE-8.
   |  ldr PC, [BASE, FRAME_PC]		// Fetch PC of previous frame.
   |    str TMP0, [BASE, #-8]		// Prepend false to error message.
   |   st_vmstate ST_INTERP
   |  b ->vm_returnc
   |
   |//-----------------------------------------------------------------------
   |//-- Grow stack for calls -----------------------------------------------
   |//-----------------------------------------------------------------------
   |
   |->vm_growstack_c:			// Grow stack for C function.
   |  // CARG1 = L
   |  mov CARG2, #LUA_MINSTACK
   |  b >2
   |
   |->vm_growstack_l:			// Grow stack for Lua function.
   |  // BASE = new base, RA = BASE+framesize*8, RC = nargs*8, PC = first PC
   |  add RC, BASE, RC
   |   sub RA, RA, BASE
   |    mov CARG1, L
   |  stp BASE, RC, L->base
   |   add PC, PC, #4			// Must point after first instruction.
   |   lsr CARG2, RA, #3
   |2:
   |  // L->base = new base, L->top = top
   |  str PC, SAVE_PC
   |  bl extern lj_state_growstack	// (lua_State *L, int n)
   |  ldp BASE, RC, L->base
   |  ldr LFUNC:CARG3, [BASE, FRAME_FUNC]
   |   sub NARGS8:RC, RC, BASE
   |  and LFUNC:CARG3, CARG3, #LJ_GCVMASK
   |  // BASE = new base, RB = LFUNC/CFUNC, RC = nargs*8, FRAME_PC(BASE) = PC
   |  ins_callt				// Just retry the call.
   |
   |//-----------------------------------------------------------------------
   |//-- Entry points into the assembler VM ---------------------------------
   |//-----------------------------------------------------------------------
   |
   |->vm_resume:				// Setup C frame and resume thread.
   |  // (lua_State *L, TValue *base, int nres1 = 0, ptrdiff_t ef = 0)
   |  saveregs
   |  mov L, CARG1
   |    ldr GL, L->glref			// Setup pointer to global state.
   |  mov BASE, CARG2
   |   str L, SAVE_L
   |  mov PC, #FRAME_CP
   |   str wzr, SAVE_NRES
   |    add TMP0, sp, #CFRAME_RESUME
   |  ldrb TMP1w, L->status
   |   str wzr, SAVE_ERRF
   |   str L, SAVE_PC			// Any value outside of bytecode is ok.
   |   str xzr, SAVE_CFRAME
   |    str TMP0, L->cframe
   |  cbz TMP1w, >3
   |
   |  // Resume after yield (like a return).
   |  str L, GL->cur_L
   |  mov RA, BASE
   |   ldp BASE, CARG1, L->base
   |    movz TISNUM, #(LJ_TISNUM>>1)&0xffff, lsl #48
   |    movz TISNUMhi, #(LJ_TISNUM>>1)&0xffff, lsl #16
   |  ldr PC, [BASE, FRAME_PC]
   |     strb wzr, L->status
   |    movn TISNIL, #0
   |   sub RC, CARG1, BASE
   |  ands CARG1, PC, #FRAME_TYPE
   |   add RC, RC, #8
   |     st_vmstate ST_INTERP
   |   str RCw, SAVE_MULTRES
   |  beq ->BC_RET_Z
   |  b ->vm_return
   |
   |->vm_pcall:				// Setup protected C frame and enter VM.
   |  // (lua_State *L, TValue *base, int nres1, ptrdiff_t ef)
   |  saveregs
   |  mov PC, #FRAME_CP
   |  str CARG4w, SAVE_ERRF
   |  b >1
   |
   |->vm_call:				// Setup C frame and enter VM.
   |  // (lua_State *L, TValue *base, int nres1)
   |  saveregs
   |  mov PC, #FRAME_C
   |
   |1:  // Entry point for vm_pcall above (PC = ftype).
   |  ldr RC, L:CARG1->cframe
   |   str CARG3w, SAVE_NRES
   |    mov L, CARG1
   |   str CARG1, SAVE_L
   |    ldr GL, L->glref			// Setup pointer to global state.
   |     mov BASE, CARG2
   |   str CARG1, SAVE_PC		// Any value outside of bytecode is ok.
   |  str RC, SAVE_CFRAME
   |  str fp, L->cframe			// Add our C frame to cframe chain.
   |
   |3:  // Entry point for vm_cpcall/vm_resume (BASE = base, PC = ftype).
   |  str L, GL->cur_L
   |  ldp RB, CARG1, L->base		// RB = old base (for vmeta_call).
   |    movz TISNUM, #(LJ_TISNUM>>1)&0xffff, lsl #48
   |    movz TISNUMhi, #(LJ_TISNUM>>1)&0xffff, lsl #16
   |  add PC, PC, BASE
   |    movn TISNIL, #0
   |  sub PC, PC, RB			// PC = frame delta + frame type
   |   sub NARGS8:RC, CARG1, BASE
   |    st_vmstate ST_INTERP
   |
   |->vm_call_dispatch:
   |  // RB = old base, BASE = new base, RC = nargs*8, PC = caller PC
   |  ldr CARG3, [BASE, FRAME_FUNC]
   |  checkfunc CARG3, ->vmeta_call
   |
   |->vm_call_dispatch_f:
   |  ins_call
   |  // BASE = new base, CARG3 = func, RC = nargs*8, PC = caller PC
   |
   |->vm_cpcall:				// Setup protected C frame, call C.
   |  // (lua_State *L, lua_CFunction func, void *ud, lua_CPFunction cp)
   |  saveregs
   |  mov L, CARG1
   |   ldr RA, L:CARG1->stack
   |  str CARG1, SAVE_L
   |    ldr GL, L->glref			// Setup pointer to global state.
   |   ldr RB, L->top
   |  str CARG1, SAVE_PC			// Any value outside of bytecode is ok.
   |  ldr RC, L->cframe
   |   sub RA, RA, RB			// Compute -savestack(L, L->top).
   |   str RAw, SAVE_NRES		// Neg. delta means cframe w/o frame.
   |  str wzr, SAVE_ERRF			// No error function.
   |  str RC, SAVE_CFRAME
   |  str fp, L->cframe			// Add our C frame to cframe chain.
   |    str L, GL->cur_L
   |  blr CARG4			// (lua_State *L, lua_CFunction func, void *ud)
   |  mov BASE, CRET1
   |   mov PC, #FRAME_CP
   |  cbnz BASE, <3			// Else continue with the call.
   |  b ->vm_leave_cp			// No base? Just remove C frame.
   |
   |//-----------------------------------------------------------------------
   |//-- Metamethod handling ------------------------------------------------
   |//-----------------------------------------------------------------------
   |
   |//-- Continuation dispatch ----------------------------------------------
   |
   |->cont_dispatch:
   |  // BASE = meta base, RA = resultptr, RC = (nresults+1)*8
   |  ldr LFUNC:CARG3, [RB, FRAME_FUNC]
   |    ldr CARG1, [BASE, #-32]		// Get continuation.
   |   mov CARG4, BASE
   |   mov BASE, RB			// Restore caller BASE.
   |  and LFUNC:CARG3, CARG3, #LJ_GCVMASK
   |.if FFI
   |    cmp CARG1, #1
   |.endif
   |   ldr PC, [CARG4, #-24]		// Restore PC from [cont|PC].
   |  ldr CARG3, LFUNC:CARG3->pc
   |    add TMP0, RA, RC
   |    str TISNIL, [TMP0, #-8]		// Ensure one valid arg.
   |.if FFI
   |    bls >1
   |.endif
   |  ldr KBASE, [CARG3, #PC2PROTO(k)]
   |  // BASE = base, RA = resultptr, CARG4 = meta base
   |    br CARG1
   |
   |.if FFI
   |1:
   |  beq ->cont_ffi_callback		// cont = 1: return from FFI callback.
   |  // cont = 0: tailcall from C function.
   |   sub CARG4, CARG4, #32
   |   sub RC, CARG4, BASE
   |  b ->vm_call_tail
   |.endif
   |
   |->cont_cat:				// RA = resultptr, CARG4 = meta base
   |  ldr INSw, [PC, #-4]
   |   sub CARG2, CARG4, #32
   |   ldr TMP0, [RA]
   |     str BASE, L->base
   |  decode_RB RB, INS
   |   decode_RA RA, INS
   |  add TMP1, BASE, RB, lsl #3
   |  subs TMP1, CARG2, TMP1
   |  beq >1
   |   str TMP0, [CARG2]
   |  lsr CARG3, TMP1, #3
   |  b ->BC_CAT_Z
   |
   |1:
   |   str TMP0, [BASE, RA, lsl #3]
   |  b ->cont_nop
   |
   |//-- Table indexing metamethods -----------------------------------------
   |
   |->vmeta_tgets1:
   |  movn CARG4, #~LJ_TSTR
   |   add CARG2, BASE, RB, lsl #3
   |  add CARG4, STR:RC, CARG4, lsl #47
   |  b >2
   |
   |->vmeta_tgets:
   |  movk CARG2, #(LJ_TTAB>>1)&0xffff, lsl #48
   |  str CARG2, GL->tmptv
   |  add CARG2, GL, #offsetof(global_State, tmptv)
   |2:
   |   add CARG3, sp, TMPDofs
   |  str CARG4, TMPD
   |  b >1
   |
   |->vmeta_tgetb:			// RB = table, RC = index
   |  add RC, RC, TISNUM
   |   add CARG2, BASE, RB, lsl #3
   |   add CARG3, sp, TMPDofs
   |  str RC, TMPD
   |  b >1
   |
   |->vmeta_tgetv:			// RB = table, RC = key
   |  add CARG2, BASE, RB, lsl #3
   |   add CARG3, BASE, RC, lsl #3
   |1:
   |   str BASE, L->base
   |  mov CARG1, L
   |   str PC, SAVE_PC
   |  bl extern lj_meta_tget		// (lua_State *L, TValue *o, TValue *k)
   |  // Returns TValue * (finished) or NULL (metamethod).
   |  cbz CRET1, >3
   |  ldr TMP0, [CRET1]
   |  str TMP0, [BASE, RA, lsl #3]
   |  ins_next
   |
   |3:  // Call __index metamethod.
   |  // BASE = base, L->top = new base, stack = cont/func/t/k
   |   sub TMP1, BASE, #FRAME_CONT
   |  ldr BASE, L->top
   |    mov NARGS8:RC, #16		// 2 args for func(t, k).
   |  ldr LFUNC:CARG3, [BASE, FRAME_FUNC]  // Guaranteed to be a function here.
   |    str PC, [BASE, #-24]		// [cont|PC]
   |   sub PC, BASE, TMP1
   |  and LFUNC:CARG3, CARG3, #LJ_GCVMASK
   |  b ->vm_call_dispatch_f
   |
   |->vmeta_tgetr:
   |  sxtw CARG2, TMP1w
   |  bl extern lj_tab_getinth		// (GCtab *t, int32_t key)
   |  // Returns cTValue * or NULL.
   |  mov TMP0, TISNIL
   |  cbz CRET1, ->BC_TGETR_Z
   |  ldr TMP0, [CRET1]
   |  b ->BC_TGETR_Z
   |
   |//-----------------------------------------------------------------------
   |
   |->vmeta_tsets1:
   |  movn CARG4, #~LJ_TSTR
   |   add CARG2, BASE, RB, lsl #3
   |  add CARG4, STR:RC, CARG4, lsl #47
   |  b >2
   |
   |->vmeta_tsets:
   |  movk CARG2, #(LJ_TTAB>>1)&0xffff, lsl #48
   |  str CARG2, GL->tmptv
   |  add CARG2, GL, #offsetof(global_State, tmptv)
   |2:
   |   add CARG3, sp, TMPDofs
   |  str CARG4, TMPD
   |  b >1
   |
   |->vmeta_tsetb:			// RB = table, RC = index
   |  add RC, RC, TISNUM
   |   add CARG2, BASE, RB, lsl #3
   |   add CARG3, sp, TMPDofs
   |  str RC, TMPD
   |  b >1
   |
   |->vmeta_tsetv:
   |  add CARG2, BASE, RB, lsl #3
   |   add CARG3, BASE, RC, lsl #3
   |1:
   |   str BASE, L->base
   |  mov CARG1, L
   |   str PC, SAVE_PC
   |  bl extern lj_meta_tset		// (lua_State *L, TValue *o, TValue *k)
   |  // Returns TValue * (finished) or NULL (metamethod).
   |   ldr TMP0, [BASE, RA, lsl #3]
   |  cbz CRET1, >3
   |  // NOBARRIER: lj_meta_tset ensures the table is not black.
   |   str TMP0, [CRET1]
   |  ins_next
   |
   |3:  // Call __newindex metamethod.
   |  // BASE = base, L->top = new base, stack = cont/func/t/k/(v)
   |   sub TMP1, BASE, #FRAME_CONT
   |  ldr BASE, L->top
   |    mov NARGS8:RC, #24		// 3 args for func(t, k, v).
   |  ldr LFUNC:CARG3, [BASE, FRAME_FUNC]  // Guaranteed to be a function here.
   |   str TMP0, [BASE, #16]		// Copy value to third argument.
   |    str PC, [BASE, #-24]		// [cont|PC]
   |   sub PC, BASE, TMP1
   |  and LFUNC:CARG3, CARG3, #LJ_GCVMASK
   |  b ->vm_call_dispatch_f
   |
   |->vmeta_tsetr:
   |  sxtw CARG3, TMP1w
   |  str BASE, L->base
   |  str PC, SAVE_PC
   |  bl extern lj_tab_setinth  // (lua_State *L, GCtab *t, int32_t key)
   |  // Returns TValue *.
   |  b ->BC_TSETR_Z
   |
   |//-- Comparison metamethods ---------------------------------------------
   |
   |->vmeta_comp:
   |  add CARG2, BASE, RA, lsl #3
   |   sub PC, PC, #4
   |  add CARG3, BASE, RC, lsl #3
   |   str BASE, L->base
   |  mov CARG1, L
   |   str PC, SAVE_PC
   |  uxtb CARG4w, INSw
   |  bl extern lj_meta_comp  // (lua_State *L, TValue *o1, *o2, int op)
   |  // Returns 0/1 or TValue * (metamethod).
   |3:
   |  cmp CRET1, #1
   |  bhi ->vmeta_binop
   |4:
   |   ldrh RBw, [PC, #2]
   |    add PC, PC, #4
   |   add RB, PC, RB, lsl #2
   |   sub RB, RB, #0x20000
   |  csel PC, PC, RB, lo
   |->cont_nop:
   |  ins_next
   |
   |->cont_ra:				// RA = resultptr
   |  ldr INSw, [PC, #-4]
   |   ldr TMP0, [RA]
   |  decode_RA TMP1, INS
   |   str TMP0, [BASE, TMP1, lsl #3]
   |  b ->cont_nop
   |
   |->cont_condt:			// RA = resultptr
   |  ldr TMP0, [RA]
   |   mov_true TMP1
   |  cmp TMP1, TMP0			// Branch if result is true.
   |  b <4
   |
   |->cont_condf:			// RA = resultptr
   |  ldr TMP0, [RA]
   |   mov_false TMP1
   |  cmp TMP0, TMP1			// Branch if result is false.
   |  b <4
   |
   |->vmeta_equal:
   |  // CARG2, CARG3, CARG4 are already set by BC_ISEQV/BC_ISNEV.
   |  and TAB:CARG3, CARG3, #LJ_GCVMASK
   |  sub PC, PC, #4
   |   str BASE, L->base
   |   mov CARG1, L
   |  str PC, SAVE_PC
   |  bl extern lj_meta_equal  // (lua_State *L, GCobj *o1, *o2, int ne)
   |  // Returns 0/1 or TValue * (metamethod).
   |  b <3
   |
   |->vmeta_equal_cd:
   |.if FFI
   |  sub PC, PC, #4
   |   str BASE, L->base
   |   mov CARG1, L
   |   mov CARG2, INS
   |  str PC, SAVE_PC
   |  bl extern lj_meta_equal_cd		// (lua_State *L, BCIns op)
   |  // Returns 0/1 or TValue * (metamethod).
   |  b <3
   |.endif
   |
   |->vmeta_istype:
   |  sub PC, PC, #4
   |   str BASE, L->base
   |   mov CARG1, L
   |   mov CARG2, RA
   |   mov CARG3, RC
   |  str PC, SAVE_PC
   |  bl extern lj_meta_istype  // (lua_State *L, BCReg ra, BCReg tp)
   |  b ->cont_nop
   |
   |//-- Arithmetic metamethods ---------------------------------------------
   |
   |->vmeta_arith_vn:
   |  add CARG3, BASE, RB, lsl #3
   |   add CARG4, KBASE, RC, lsl #3
   |  b >1
   |
   |->vmeta_arith_nv:
   |  add CARG4, BASE, RB, lsl #3
   |   add CARG3, KBASE, RC, lsl #3
   |  b >1
   |
   |->vmeta_unm:
   |  add CARG3, BASE, RC, lsl #3
   |  mov CARG4, CARG3
   |  b >1
   |
   |->vmeta_arith_vv:
   |  add CARG3, BASE, RB, lsl #3
   |   add CARG4, BASE, RC, lsl #3
   |1:
   |  uxtb CARG5w, INSw
   |   add CARG2, BASE, RA, lsl #3
   |    str BASE, L->base
   |   mov CARG1, L
   |    str PC, SAVE_PC
   |  bl extern lj_meta_arith  // (lua_State *L, TValue *ra,*rb,*rc, BCReg op)
   |  // Returns NULL (finished) or TValue * (metamethod).
   |  cbz CRET1, ->cont_nop
   |
   |  // Call metamethod for binary op.
   |->vmeta_binop:
   |  // BASE = old base, CRET1 = new base, stack = cont/func/o1/o2
   |  sub TMP1, CRET1, BASE
   |   str PC, [CRET1, #-24]		// [cont|PC]
   |  add PC, TMP1, #FRAME_CONT
   |  mov BASE, CRET1
   |   mov NARGS8:RC, #16		// 2 args for func(o1, o2).
   |  b ->vm_call_dispatch
   |
   |->vmeta_len:
   |  add CARG2, BASE, RC, lsl #3
 #if LJ_52
   |  mov TAB:RC, TAB:CARG1		// Save table (ignored for other types).
 #endif
   |   str BASE, L->base
   |  mov CARG1, L
   |   str PC, SAVE_PC
   |  bl extern lj_meta_len		// (lua_State *L, TValue *o)
   |  // Returns NULL (retry) or TValue * (metamethod base).
 #if LJ_52
   |  cbnz CRET1, ->vmeta_binop		// Binop call for compatibility.
   |  mov TAB:CARG1, TAB:RC
   |  b ->BC_LEN_Z
 #else
   |  b ->vmeta_binop			// Binop call for compatibility.
 #endif
   |
   |//-- Call metamethod ----------------------------------------------------
   |
   |->vmeta_call:			// Resolve and call __call metamethod.
   |  // RB = old base, BASE = new base, RC = nargs*8
   |  mov CARG1, L
   |   str RB, L->base			// This is the callers base!
   |  sub CARG2, BASE, #16
   |   str PC, SAVE_PC
   |  add CARG3, BASE, NARGS8:RC
   |  bl extern lj_meta_call	// (lua_State *L, TValue *func, TValue *top)
   |  ldr LFUNC:CARG3, [BASE, FRAME_FUNC]  // Guaranteed to be a function here.
   |   add NARGS8:RC, NARGS8:RC, #8	// Got one more argument now.
   |  and LFUNC:CARG3, CARG3, #LJ_GCVMASK
   |  ins_call
   |
   |->vmeta_callt:			// Resolve __call for BC_CALLT.
   |  // BASE = old base, RA = new base, RC = nargs*8
   |  mov CARG1, L
   |   str BASE, L->base
   |  sub CARG2, RA, #16
   |   str PC, SAVE_PC
   |  add CARG3, RA, NARGS8:RC
   |  bl extern lj_meta_call	// (lua_State *L, TValue *func, TValue *top)
   |  ldr TMP1, [RA, FRAME_FUNC]		// Guaranteed to be a function here.
   |   ldr PC, [BASE, FRAME_PC]
   |   add NARGS8:RC, NARGS8:RC, #8	// Got one more argument now.
   |  and LFUNC:CARG3, TMP1, #LJ_GCVMASK
   |  b ->BC_CALLT2_Z
   |
   |//-- Argument coercion for 'for' statement ------------------------------
   |
   |->vmeta_for:
   |  mov CARG1, L
   |   str BASE, L->base
   |  mov CARG2, RA
   |   str PC, SAVE_PC
   |  bl extern lj_meta_for	// (lua_State *L, TValue *base)
   |  ldr INSw, [PC, #-4]
   |.if JIT
   |   uxtb TMP0, INS
   |.endif
   |  decode_RA RA, INS
   |  decode_RD RC, INS
   |.if JIT
   |   cmp TMP0, #BC_JFORI
   |   beq =>BC_JFORI
   |.endif
   |  b =>BC_FORI
   |
   |//-----------------------------------------------------------------------
   |//-- Fast functions -----------------------------------------------------
   |//-----------------------------------------------------------------------
   |
   |.macro .ffunc, name
   |->ff_ .. name:
   |.endmacro
   |
   |.macro .ffunc_1, name
   |->ff_ .. name:
   |  ldr CARG1, [BASE]
   |   cmp NARGS8:RC, #8
   |   blo ->fff_fallback
   |.endmacro
   |
   |.macro .ffunc_2, name
   |->ff_ .. name:
   |  ldp CARG1, CARG2, [BASE]
   |   cmp NARGS8:RC, #16
   |   blo ->fff_fallback
   |.endmacro
   |
   |.macro .ffunc_n, name
   |  .ffunc name
   |  ldr CARG1, [BASE]
   |   cmp NARGS8:RC, #8
   |  ldr FARG1, [BASE]
   |   blo ->fff_fallback
   |  checknum CARG1, ->fff_fallback
   |.endmacro
   |
   |.macro .ffunc_nn, name
   |  .ffunc name
   |  ldp CARG1, CARG2, [BASE]
   |   cmp NARGS8:RC, #16
   |  ldp FARG1, FARG2, [BASE]
   |   blo ->fff_fallback
   |  checknum CARG1, ->fff_fallback
   |  checknum CARG2, ->fff_fallback
   |.endmacro
   |
   |// Inlined GC threshold check. Caveat: uses CARG1 and CARG2.
   |.macro ffgccheck
   |  ldp CARG1, CARG2, GL->gc.total	// Assumes threshold follows total.
   |  cmp CARG1, CARG2
   |  blt >1
   |  bl ->fff_gcstep
   |1:
   |.endmacro
   |
   |//-- Base library: checks -----------------------------------------------
   |
   |.ffunc_1 assert
   |   ldr PC, [BASE, FRAME_PC]
   |  mov_false TMP1
   |  cmp CARG1, TMP1
   |  bhs ->fff_fallback
   |  str CARG1, [BASE, #-16]
   |  sub RB, BASE, #8
   |  subs RA, NARGS8:RC, #8
   |   add RC, NARGS8:RC, #8		// Compute (nresults+1)*8.
   |  cbz RA, ->fff_res			// Done if exactly 1 argument.
   |1:
   |   ldr CARG1, [RB, #16]
   |  sub RA, RA, #8
   |   str CARG1, [RB], #8
   |  cbnz RA, <1
   |  b ->fff_res
   |
   |.ffunc_1 type
   |  mov TMP0, #~LJ_TISNUM
   |  asr ITYPE, CARG1, #47
   |  cmn ITYPE, #~LJ_TISNUM
   |  csinv TMP1, TMP0, ITYPE, lo
   |  add TMP1, TMP1, #offsetof(GCfuncC, upvalue)/8
   |  ldr CARG1, [CFUNC:CARG3, TMP1, lsl #3]
   |  b ->fff_restv
   |
   |//-- Base library: getters and setters ---------------------------------
   |
   |.ffunc_1 getmetatable
   |  asr ITYPE, CARG1, #47
   |  cmn ITYPE, #-LJ_TTAB
   |  ccmn ITYPE, #-LJ_TUDATA, #4, ne
   |   and TAB:CARG1, CARG1, #LJ_GCVMASK
   |  bne >6
   |1:  // Field metatable must be at same offset for GCtab and GCudata!
   |  ldr TAB:RB, TAB:CARG1->metatable
   |2:
   |   mov CARG1, TISNIL
   |   ldr STR:RC, GL->gcroot[GCROOT_MMNAME+MM_metatable]
   |  cbz TAB:RB, ->fff_restv
   |  ldr TMP1w, TAB:RB->hmask
   |   ldr TMP2w, STR:RC->hash
   |    ldr NODE:CARG3, TAB:RB->node
   |  and TMP1w, TMP1w, TMP2w		// idx = str->hash & tab->hmask
   |  add TMP1, TMP1, TMP1, lsl #1
   |  movn CARG4, #~LJ_TSTR
   |    add NODE:CARG3, NODE:CARG3, TMP1, lsl #3  // node = tab->node + idx*3*8
   |  add CARG4, STR:RC, CARG4, lsl #47	// Tagged key to look for.
   |3:  // Rearranged logic, because we expect _not_ to find the key.
   |  ldp CARG1, TMP0, NODE:CARG3->val
   |   ldr NODE:CARG3, NODE:CARG3->next
   |  cmp TMP0, CARG4
   |  beq >5
   |  cbnz NODE:CARG3, <3
   |4:
   |  mov CARG1, RB			// Use metatable as default result.
   |  movk CARG1, #(LJ_TTAB>>1)&0xffff, lsl #48
   |  b ->fff_restv
   |5:
   |  cmp TMP0, TISNIL
   |  bne ->fff_restv
   |  b <4
   |
   |6:
   |  movn TMP0, #~LJ_TISNUM
   |  cmp ITYPE, TMP0
   |  csel ITYPE, ITYPE, TMP0, hs
   |  sub TMP1, GL, ITYPE, lsl #3
   |  ldr TAB:RB, [TMP1, #offsetof(global_State, gcroot[GCROOT_BASEMT])-8]
   |  b <2
   |
   |.ffunc_2 setmetatable
   |  // Fast path: no mt for table yet and not clearing the mt.
   |  checktp TMP1, CARG1, LJ_TTAB, ->fff_fallback
   |   ldr TAB:TMP0, TAB:TMP1->metatable
   |  asr ITYPE, CARG2, #47
   |   ldrb TMP2w, TAB:TMP1->marked
   |  cmn ITYPE, #-LJ_TTAB
   |    and TAB:CARG2, CARG2, #LJ_GCVMASK
   |  ccmp TAB:TMP0, #0, #0, eq
   |  bne ->fff_fallback
   |    str TAB:CARG2, TAB:TMP1->metatable
   |   tbz TMP2w, #2, ->fff_restv	// isblack(table)
   |  barrierback TAB:TMP1, TMP2w, TMP0
   |  b ->fff_restv
   |
   |.ffunc rawget
   |  ldr CARG2, [BASE]
   |   cmp NARGS8:RC, #16
   |   blo ->fff_fallback
   |  checktab CARG2, ->fff_fallback
   |   mov CARG1, L
   |   add CARG3, BASE, #8
   |  bl extern lj_tab_get  // (lua_State *L, GCtab *t, cTValue *key)
   |  // Returns cTValue *.
   |  ldr CARG1, [CRET1]
   |  b ->fff_restv
   |
   |//-- Base library: conversions ------------------------------------------
   |
   |.ffunc tonumber
   |  // Only handles the number case inline (without a base argument).
   |  ldr CARG1, [BASE]
   |   cmp NARGS8:RC, #8
   |   bne ->fff_fallback
   |  checknumber CARG1, ->fff_fallback
   |  b ->fff_restv
   |
   |.ffunc_1 tostring
   |  // Only handles the string or number case inline.
   |  asr ITYPE, CARG1, #47
   |  cmn ITYPE, #-LJ_TSTR
   |  // A __tostring method in the string base metatable is ignored.
   |  beq ->fff_restv
   |  // Handle numbers inline, unless a number base metatable is present.
   |  ldr TMP1, GL->gcroot[GCROOT_BASEMT_NUM]
   |   str BASE, L->base
   |  cmn ITYPE, #-LJ_TISNUM
   |  ccmp TMP1, #0, #0, ls
   |   str PC, SAVE_PC			// Redundant (but a defined value).
   |  bne ->fff_fallback
   |  ffgccheck
   |  mov CARG1, L
   |  mov CARG2, BASE
   |  bl extern lj_strfmt_number		// (lua_State *L, cTValue *o)
   |  // Returns GCstr *.
   |   movn TMP1, #~LJ_TSTR
   |  ldr BASE, L->base
   |   add CARG1, CARG1, TMP1, lsl #47
   |  b ->fff_restv
   |
   |//-- Base library: iterators -------------------------------------------
   |
   |.ffunc_1 next
   |  checktp CARG2, CARG1, LJ_TTAB, ->fff_fallback
   |  str TISNIL, [BASE, NARGS8:RC]	// Set missing 2nd arg to nil.
   |  ldr PC, [BASE, FRAME_PC]
   |   stp BASE, BASE, L->base		// Add frame since C call can throw.
   |  mov CARG1, L
   |  add CARG3, BASE, #8
   |   str PC, SAVE_PC
   |  bl extern lj_tab_next	// (lua_State *L, GCtab *t, TValue *key)
   |  // Returns 0 at end of traversal.
   |  str TISNIL, [BASE, #-16]
   |  cbz CRET1, ->fff_res1		// End of traversal: return nil.
   |  ldp CARG1, CARG2, [BASE, #8]	// Copy key and value to results.
   |    mov RC, #(2+1)*8
   |  stp CARG1, CARG2, [BASE, #-16]
   |  b ->fff_res
   |
   |.ffunc_1 pairs
   |  checktp TMP1, CARG1, LJ_TTAB, ->fff_fallback
 #if LJ_52
   |  ldr TAB:CARG2, TAB:TMP1->metatable
 #endif
   |   ldr CFUNC:CARG4, CFUNC:CARG3->upvalue[0]
   |    ldr PC, [BASE, FRAME_PC]
 #if LJ_52
   |  cbnz TAB:CARG2, ->fff_fallback
 #endif
   |  mov RC, #(3+1)*8
   |  stp CARG1, TISNIL, [BASE, #-8]
   |   str CFUNC:CARG4, [BASE, #-16]
   |  b ->fff_res
   |
   |.ffunc_2 ipairs_aux
   |  checktab CARG1, ->fff_fallback
   |   checkint CARG2, ->fff_fallback
   |  ldr TMP1w, TAB:CARG1->asize
   |   ldr CARG3, TAB:CARG1->array
   |    ldr TMP0w, TAB:CARG1->hmask
   |  add CARG2w, CARG2w, #1
   |  cmp CARG2w, TMP1w
   |    ldr PC, [BASE, FRAME_PC]
   |     add TMP2, CARG2, TISNUM
   |   mov RC, #(0+1)*8
   |     str TMP2, [BASE, #-16]
   |  bhs >2				// Not in array part?
   |  ldr TMP0, [CARG3, CARG2, lsl #3]
   |1:
   |   mov TMP1, #(2+1)*8
   |   cmp TMP0, TISNIL
   |  str TMP0, [BASE, #-8]
   |   csel RC, RC, TMP1, eq
   |  b ->fff_res
   |2:  // Check for empty hash part first. Otherwise call C function.
   |  cbz TMP0w, ->fff_res
   |  bl extern lj_tab_getinth		// (GCtab *t, int32_t key)
   |  // Returns cTValue * or NULL.
   |  cbz CRET1, ->fff_res
   |  ldr TMP0, [CRET1]
   |  b <1
   |
   |.ffunc_1 ipairs
   |  checktp TMP1, CARG1, LJ_TTAB, ->fff_fallback
 #if LJ_52
   |  ldr TAB:CARG2, TAB:TMP1->metatable
 #endif
   |   ldr CFUNC:CARG4, CFUNC:CARG3->upvalue[0]
   |    ldr PC, [BASE, FRAME_PC]
 #if LJ_52
   |  cbnz TAB:CARG2, ->fff_fallback
 #endif
   |  mov RC, #(3+1)*8
   |  stp CARG1, TISNUM, [BASE, #-8]
   |   str CFUNC:CARG4, [BASE, #-16]
   |  b ->fff_res
   |
   |//-- Base library: catch errors ----------------------------------------
   |
   |.ffunc pcall
   |  ldrb TMP0w, GL->hookmask
   |   subs NARGS8:RC, NARGS8:RC, #8
   |   blo ->fff_fallback
   |    mov RB, BASE
   |    add BASE, BASE, #16
   |  ubfx TMP0w, TMP0w, #HOOK_ACTIVE_SHIFT, #1
   |  add PC, TMP0, #16+FRAME_PCALL
   |   beq ->vm_call_dispatch
   |1:
   |   add TMP2, BASE, NARGS8:RC
   |2:
   |   ldr TMP0, [TMP2, #-16]
   |   str TMP0, [TMP2, #-8]!
   |  cmp TMP2, BASE
   |  bne <2
   |  b ->vm_call_dispatch
   |
   |.ffunc xpcall
   |     ldp CARG1, CARG2, [BASE]
   |  ldrb TMP0w, GL->hookmask
   |   subs NARGS8:RC, NARGS8:RC, #16
   |   blo ->fff_fallback
   |    mov RB, BASE
   |    add BASE, BASE, #24
   |     asr ITYPE, CARG2, #47
   |  ubfx TMP0w, TMP0w, #HOOK_ACTIVE_SHIFT, #1
   |     cmn ITYPE, #-LJ_TFUNC
   |  add PC, TMP0, #24+FRAME_PCALL
   |     bne ->fff_fallback		// Traceback must be a function.
   |     stp CARG2, CARG1, [RB]		// Swap function and traceback.
   |   cbz NARGS8:RC, ->vm_call_dispatch
   |  b <1
   |
   |//-- Coroutine library --------------------------------------------------
   |
   |.macro coroutine_resume_wrap, resume
   |.if resume
   |.ffunc_1 coroutine_resume
   |  checktp CARG1, LJ_TTHREAD, ->fff_fallback
   |.else
   |.ffunc coroutine_wrap_aux
   |  ldr L:CARG1, CFUNC:CARG3->upvalue[0].gcr
   |  and L:CARG1, CARG1, #LJ_GCVMASK
   |.endif
   |   ldr PC, [BASE, FRAME_PC]
   |     str BASE, L->base
   |  ldp RB, CARG2, L:CARG1->base
   |   ldrb TMP1w, L:CARG1->status
   |  add TMP0, CARG2, TMP1
   |   str PC, SAVE_PC
   |  cmp TMP0, RB
   |  beq ->fff_fallback
   |   cmp TMP1, #LUA_YIELD
   |    add TMP0, CARG2, #8
   |   csel CARG2, CARG2, TMP0, hs
   |   ldr CARG4, L:CARG1->maxstack
   |   add CARG3, CARG2, NARGS8:RC
   |    ldr RB, L:CARG1->cframe
   |   ccmp CARG3, CARG4, #2, ls
   |    ccmp RB, #0, #2, ls
   |    bhi ->fff_fallback
   |.if resume
   |  sub CARG3, CARG3, #8		// Keep resumed thread in stack for GC.
   |  add BASE, BASE, #8
   |  sub NARGS8:RC, NARGS8:RC, #8
   |.endif
   |  str CARG3, L:CARG1->top
   |  str BASE, L->top
   |  cbz NARGS8:RC, >3
   |2:  // Move args to coroutine.
   |   ldr TMP0, [BASE, RB]
   |  cmp RB, NARGS8:RC
   |   str TMP0, [CARG2, RB]
   |   add RB, RB, #8
   |  bne <2
   |3:
   |  mov CARG3, #0
   |   mov L:RA, L:CARG1
   |  mov CARG4, #0
   |  bl ->vm_resume			// (lua_State *L, TValue *base, 0, 0)
   |  // Returns thread status.
   |4:
   |  ldp CARG3, CARG4, L:RA->base
   |   cmp CRET1, #LUA_YIELD
   |  ldr BASE, L->base
   |    str L, GL->cur_L
   |    st_vmstate ST_INTERP
   |   bhi >8
   |  sub RC, CARG4, CARG3
   |   ldr CARG1, L->maxstack
   |   add CARG2, BASE, RC
   |  cbz RC, >6				// No results?
   |  cmp CARG2, CARG1
   |   mov RB, #0
   |  bhi >9				// Need to grow stack?
   |
   |  sub CARG4, RC, #8
   |   str CARG3, L:RA->top		// Clear coroutine stack.
   |5:  // Move results from coroutine.
   |   ldr TMP0, [CARG3, RB]
   |  cmp RB, CARG4
   |   str TMP0, [BASE, RB]
   |   add RB, RB, #8
   |  bne <5
   |6:
   |.if resume
   |  mov_true TMP1
   |   add RC, RC, #16
   |7:
   |  str TMP1, [BASE, #-8]		// Prepend true/false to results.
   |   sub RA, BASE, #8
   |.else
   |   mov RA, BASE
   |   add RC, RC, #8
   |.endif
   |  ands CARG1, PC, #FRAME_TYPE
   |   str PC, SAVE_PC
   |   str RCw, SAVE_MULTRES
   |  beq ->BC_RET_Z
   |  b ->vm_return
   |
   |8:  // Coroutine returned with error (at co->top-1).
   |.if resume
   |  ldr TMP0, [CARG4, #-8]!
   |   mov_false TMP1
   |    mov RC, #(2+1)*8
   |  str CARG4, L:RA->top		// Remove error from coroutine stack.
   |  str TMP0, [BASE]			// Copy error message.
   |  b <7
   |.else
   |  mov CARG1, L
   |  mov CARG2, L:RA
   |  bl extern lj_ffh_coroutine_wrap_err  // (lua_State *L, lua_State *co)
   |  // Never returns.
   |.endif
   |
   |9:  // Handle stack expansion on return from yield.
   |  mov CARG1, L
   |  lsr CARG2, RC, #3
   |  bl extern lj_state_growstack	// (lua_State *L, int n)
   |  mov CRET1, #0
   |  b <4
   |.endmacro
   |
   |  coroutine_resume_wrap 1		// coroutine.resume
   |  coroutine_resume_wrap 0		// coroutine.wrap
   |
   |.ffunc coroutine_yield
   |  ldr TMP0, L->cframe
   |   add TMP1, BASE, NARGS8:RC
   |    mov CRET1, #LUA_YIELD
   |   stp BASE, TMP1, L->base
   |  tbz TMP0, #0, ->fff_fallback
   |   str xzr, L->cframe
   |    strb CRET1w, L->status
   |  b ->vm_leave_unw
   |
   |//-- Math library -------------------------------------------------------
   |
   |.macro math_round, func, round
   |  .ffunc math_ .. func
   |  ldr CARG1, [BASE]
   |   cmp NARGS8:RC, #8
   |  ldr d0, [BASE]
   |   blo ->fff_fallback
   |  cmp TISNUMhi, CARG1, lsr #32
   |  beq ->fff_restv
   |  blo ->fff_fallback
   |  round d0, d0
   |  b ->fff_resn
   |.endmacro
   |
   |  math_round floor, frintm
   |  math_round ceil, frintp
   |
   |.ffunc_1 math_abs
   |  checknumber CARG1, ->fff_fallback
   |  and CARG1, CARG1, #U64x(7fffffff,ffffffff)
   |  bne ->fff_restv
   |  eor CARG2w, CARG1w, CARG1w, asr #31
   |   movz CARG3, #0x41e0, lsl #48	// 2^31.
   |  subs CARG1w, CARG2w, CARG1w, asr #31
   |   add CARG1, CARG1, TISNUM
   |  csel CARG1, CARG1, CARG3, pl
   |  // Fallthrough.
   |
   |->fff_restv:
   |  // CARG1 = TValue result.
   |  ldr PC, [BASE, FRAME_PC]
   |  str CARG1, [BASE, #-16]
   |->fff_res1:
   |  // PC = return.
   |  mov RC, #(1+1)*8
   |->fff_res:
   |  // RC = (nresults+1)*8, PC = return.
   |  ands CARG1, PC, #FRAME_TYPE
   |   str RCw, SAVE_MULTRES
   |   sub RA, BASE, #16
   |  bne ->vm_return
   |  ldr INSw, [PC, #-4]
   |  decode_RB RB, INS
   |5:
   |  cmp RC, RB, lsl #3			// More results expected?
   |  blo >6
   |  decode_RA TMP1, INS
   |  // Adjust BASE. KBASE is assumed to be set for the calling frame.
   |  sub BASE, RA, TMP1, lsl #3
   |  ins_next
   |
   |6:  // Fill up results with nil.
   |  add TMP1, RA, RC
   |   add RC, RC, #8
   |  str TISNIL, [TMP1, #-8]
   |  b <5
   |
   |.macro math_extern, func
   |  .ffunc_n math_ .. func
   |  bl extern func
   |  b ->fff_resn
   |.endmacro
   |
   |.macro math_extern2, func
   |  .ffunc_nn math_ .. func
   |  bl extern func
   |  b ->fff_resn
   |.endmacro
   |
   |.ffunc_n math_sqrt
   |  fsqrt d0, d0
   |->fff_resn:
   |  ldr PC, [BASE, FRAME_PC]
   |  str d0, [BASE, #-16]
   |  b ->fff_res1
   |
   |.ffunc math_log
   |  ldr CARG1, [BASE]
   |   cmp NARGS8:RC, #8
   |  ldr FARG1, [BASE]
   |   bne ->fff_fallback			// Need exactly 1 argument.
   |  checknum CARG1, ->fff_fallback
   |  bl extern log
   |  b ->fff_resn
   |
   |  math_extern log10
   |  math_extern exp
   |  math_extern sin
   |  math_extern cos
   |  math_extern tan
   |  math_extern asin
   |  math_extern acos
   |  math_extern atan
   |  math_extern sinh
   |  math_extern cosh
   |  math_extern tanh
   |  math_extern2 pow
   |  math_extern2 atan2
   |  math_extern2 fmod
   |
   |.ffunc_2 math_ldexp
   |  ldr FARG1, [BASE]
   |  checknum CARG1, ->fff_fallback
   |  checkint CARG2, ->fff_fallback
   |  sxtw CARG1, CARG2w
   |  bl extern ldexp			// (double x, int exp)
   |  b ->fff_resn
   |
   |.ffunc_n math_frexp
   |  add CARG1, sp, TMPDofs
   |  bl extern frexp
   |   ldr CARG2w, TMPD
   |    ldr PC, [BASE, FRAME_PC]
   |  str d0, [BASE, #-16]
   |    mov RC, #(2+1)*8
   |   add CARG2, CARG2, TISNUM
   |   str CARG2, [BASE, #-8]
   |  b ->fff_res
   |
   |.ffunc_n math_modf
   |  sub CARG1, BASE, #16
   |   ldr PC, [BASE, FRAME_PC]
   |  bl extern modf
   |   mov RC, #(2+1)*8
   |  str d0, [BASE, #-8]
   |  b ->fff_res
   |
   |.macro math_minmax, name, cond, fcond
   |  .ffunc_1 name
   |   add RB, BASE, RC
   |   add RA, BASE, #8
   |  checkint CARG1, >4
   |1:  // Handle integers.
   |  ldr CARG2, [RA]
   |   cmp RA, RB
   |   bhs ->fff_restv
   |  checkint CARG2, >3
   |  cmp CARG1w, CARG2w
   |   add RA, RA, #8
   |  csel CARG1, CARG2, CARG1, cond
   |  b <1
   |3:  // Convert intermediate result to number and continue below.
   |  scvtf d0, CARG1w
   |  blo ->fff_fallback
   |  ldr d1, [RA]
   |  b >6
   |
   |4:
   |  ldr d0, [BASE]
   |  blo ->fff_fallback
   |5:  // Handle numbers.
   |  ldr CARG2, [RA]
   |  ldr d1, [RA]
   |   cmp RA, RB
   |   bhs ->fff_resn
   |  checknum CARG2, >7
   |6:
   |  fcmp d0, d1
   |   add RA, RA, #8
   |  fcsel d0, d1, d0, fcond
   |  b <5
   |7:  // Convert integer to number and continue above.
   |  scvtf d1, CARG2w
   |  blo ->fff_fallback
   |  b <6
   |.endmacro
   |
   |  math_minmax math_min, gt, hi
   |  math_minmax math_max, lt, lo
   |
   |//-- String library -----------------------------------------------------
   |
   |.ffunc string_byte			// Only handle the 1-arg case here.
   |  ldp PC, CARG1, [BASE, FRAME_PC]
   |   cmp NARGS8:RC, #8
   |  asr ITYPE, CARG1, #47
   |  ccmn ITYPE, #-LJ_TSTR, #0, eq
   |   and STR:CARG1, CARG1, #LJ_GCVMASK
   |  bne ->fff_fallback
   |  ldrb TMP0w, STR:CARG1[1]		// Access is always ok (NUL at end).
   |   ldr CARG3w, STR:CARG1->len
   |  add TMP0, TMP0, TISNUM
   |  str TMP0, [BASE, #-16]
   |  mov RC, #(0+1)*8
   |   cbz CARG3, ->fff_res
   |  b ->fff_res1
   |
   |.ffunc string_char			// Only handle the 1-arg case here.
   |  ffgccheck
   |  ldp PC, CARG1, [BASE, FRAME_PC]
   |  cmp CARG1w, #255
   |   ccmp NARGS8:RC, #8, #0, ls		// Need exactly 1 argument.
   |  bne ->fff_fallback
   |  checkint CARG1, ->fff_fallback
   |  mov CARG3, #1
   |  mov CARG2, BASE			// Points to stack. Little-endian.
   |->fff_newstr:
   |  // CARG2 = str, CARG3 = len.
   |   str BASE, L->base
   |  mov CARG1, L
   |   str PC, SAVE_PC
   |  bl extern lj_str_new		// (lua_State *L, char *str, size_t l)
   |->fff_resstr:
   |  // Returns GCstr *.
   |  ldr BASE, L->base
   |   movn TMP1, #~LJ_TSTR
   |  add CARG1, CARG1, TMP1, lsl #47
   |  b ->fff_restv
   |
   |.ffunc string_sub
   |  ffgccheck
   |  ldr CARG1, [BASE]
   |    ldr CARG3, [BASE, #16]
   |   cmp NARGS8:RC, #16
   |    movn RB, #0
   |   beq >1
   |   blo ->fff_fallback
   |    checkint CARG3, ->fff_fallback
   |    sxtw RB, CARG3w
   |1:
   |  ldr CARG2, [BASE, #8]
   |  checkstr CARG1, ->fff_fallback
   |   ldr TMP1w, STR:CARG1->len
   |  checkint CARG2, ->fff_fallback
   |  sxtw CARG2, CARG2w
   |  // CARG1 = str, TMP1 = str->len, CARG2 = start, RB = end
   |   add TMP2, RB, TMP1
   |   cmp RB, #0
   |  add TMP0, CARG2, TMP1
   |   csinc RB, RB, TMP2, ge		// if (end < 0) end += len+1
   |  cmp CARG2, #0
   |  csinc CARG2, CARG2, TMP0, ge	// if (start < 0) start += len+1
   |   cmp RB, #0
   |   csel RB, RB, xzr, ge		// if (end < 0) end = 0
   |  cmp CARG2, #1
   |  csinc CARG2, CARG2, xzr, ge	// if (start < 1) start = 1
   |   cmp RB, TMP1
   |   csel RB, RB, TMP1, le		// if (end > len) end = len
   |  add CARG1, STR:CARG1, #sizeof(GCstr)-1
   |   subs CARG3, RB, CARG2		// len = end - start
   |  add CARG2, CARG1, CARG2
   |   add CARG3, CARG3, #1		// len += 1
   |   bge ->fff_newstr
   |  add STR:CARG1, GL, #offsetof(global_State, strempty)
   |   movn TMP1, #~LJ_TSTR
   |  add CARG1, CARG1, TMP1, lsl #47
   |  b ->fff_restv
   |
   |.macro ffstring_op, name
   |  .ffunc string_ .. name
   |  ffgccheck
   |  ldr CARG2, [BASE]
   |   cmp NARGS8:RC, #8
   |  asr ITYPE, CARG2, #47
   |  ccmn ITYPE, #-LJ_TSTR, #0, hs
   |   and STR:CARG2, CARG2, #LJ_GCVMASK
   |  bne ->fff_fallback
   |  ldr TMP0, GL->tmpbuf.b
   |   add SBUF:CARG1, GL, #offsetof(global_State, tmpbuf)
   |   str BASE, L->base
   |   str PC, SAVE_PC
   |   str L, GL->tmpbuf.L
   |  str TMP0, GL->tmpbuf.p
   |  bl extern lj_buf_putstr_ .. name
   |  bl extern lj_buf_tostr
   |  b ->fff_resstr
   |.endmacro
   |
   |ffstring_op reverse
   |ffstring_op lower
   |ffstring_op upper
   |
   |//-- Bit library --------------------------------------------------------
   |
   |// FP number to bit conversion for soft-float. Clobbers CARG1-CARG3
   |->vm_tobit_fb:
   |  bls ->fff_fallback
   |  add CARG2, CARG1, CARG1
   |  mov CARG3, #1076
   |  sub CARG3, CARG3, CARG2, lsr #53
   |  cmp CARG3, #53
   |  bhi >1
   |  and CARG2, CARG2, #U64x(001fffff,ffffffff)
   |  orr CARG2, CARG2, #U64x(00200000,00000000)
   |   cmp CARG1, #0
   |  lsr CARG2, CARG2, CARG3
   |   cneg CARG1w, CARG2w, mi
   |  br lr
   |1:
   |  mov CARG1w, #0
   |  br lr
   |
   |.macro .ffunc_bit, name
   |  .ffunc_1 bit_..name
   |  adr lr, >1
   |  checkint CARG1, ->vm_tobit_fb
   |1:
   |.endmacro
   |
   |.macro .ffunc_bit_op, name, ins
   |  .ffunc_bit name
   |  mov RA, #8
   |  mov TMP0w, CARG1w
   |  adr lr, >2
   |1:
   |  ldr CARG1, [BASE, RA]
   |   cmp RA, NARGS8:RC
   |    add RA, RA, #8
   |   bge >9
   |  checkint CARG1, ->vm_tobit_fb
   |2:
   |  ins TMP0w, TMP0w, CARG1w
   |  b <1
   |.endmacro
   |
   |.ffunc_bit_op band, and
   |.ffunc_bit_op bor, orr
   |.ffunc_bit_op bxor, eor
   |
   |.ffunc_bit tobit
   |  mov TMP0w, CARG1w
   |9:  // Label reused by .ffunc_bit_op users.
   |  add CARG1, TMP0, TISNUM
   |  b ->fff_restv
   |
   |.ffunc_bit bswap
   |  rev TMP0w, CARG1w
   |  add CARG1, TMP0, TISNUM
   |  b ->fff_restv
   |
   |.ffunc_bit bnot
   |  mvn TMP0w, CARG1w
   |  add CARG1, TMP0, TISNUM
   |  b ->fff_restv
   |
   |.macro .ffunc_bit_sh, name, ins, shmod
   |  .ffunc bit_..name
   |  ldp TMP0, CARG1, [BASE]
   |   cmp NARGS8:RC, #16
   |   blo ->fff_fallback
   |  adr lr, >1
   |  checkint CARG1, ->vm_tobit_fb
   |1:
   |.if shmod == 0
   |  mov TMP1, CARG1
   |.else
   |  neg TMP1, CARG1
   |.endif
   |  mov CARG1, TMP0
   |  adr lr, >2
   |  checkint CARG1, ->vm_tobit_fb
   |2:
   |  ins TMP0w, CARG1w, TMP1w
   |  add CARG1, TMP0, TISNUM
   |  b ->fff_restv
   |.endmacro
   |
   |.ffunc_bit_sh lshift, lsl, 0
   |.ffunc_bit_sh rshift, lsr, 0
   |.ffunc_bit_sh arshift, asr, 0
   |.ffunc_bit_sh rol, ror, 1
   |.ffunc_bit_sh ror, ror, 0
   |
   |//-----------------------------------------------------------------------
   |
   |->fff_fallback:			// Call fast function fallback handler.
   |  // BASE = new base, RC = nargs*8
   |   ldp CFUNC:CARG3, PC, [BASE, FRAME_FUNC]	// Fallback may overwrite PC.
   |  ldr TMP2, L->maxstack
   |  add TMP1, BASE, NARGS8:RC
   |  stp BASE, TMP1, L->base
   |   and CFUNC:CARG3, CARG3, #LJ_GCVMASK
   |  add TMP1, TMP1, #8*LUA_MINSTACK
   |   ldr CARG3, CFUNC:CARG3->f
   |    str PC, SAVE_PC			// Redundant (but a defined value).
   |  cmp TMP1, TMP2
   |   mov CARG1, L
   |  bhi >5				// Need to grow stack.
   |   blr CARG3				// (lua_State *L)
   |  // Either throws an error, or recovers and returns -1, 0 or nresults+1.
   |   ldr BASE, L->base
   |  cmp CRET1w, #0
   |   lsl RC, CRET1, #3
   |   sub RA, BASE, #16
   |  bgt ->fff_res			// Returned nresults+1?
   |1:  // Returned 0 or -1: retry fast path.
   |   ldr CARG1, L->top
   |    ldr CFUNC:CARG3, [BASE, FRAME_FUNC]
   |   sub NARGS8:RC, CARG1, BASE
   |  bne ->vm_call_tail			// Returned -1?
   |    and CFUNC:CARG3, CARG3, #LJ_GCVMASK
   |  ins_callt				// Returned 0: retry fast path.
   |
   |// Reconstruct previous base for vmeta_call during tailcall.
   |->vm_call_tail:
   |  ands TMP0, PC, #FRAME_TYPE
   |   and TMP1, PC, #~FRAME_TYPEP
   |  bne >3
   |  ldrb RAw, [PC, #-3]
   |  lsl RA, RA, #3
   |  add TMP1, RA, #16
   |3:
   |  sub RB, BASE, TMP1
   |  b ->vm_call_dispatch		// Resolve again for tailcall.
   |
   |5:  // Grow stack for fallback handler.
   |  mov CARG2, #LUA_MINSTACK
   |  bl extern lj_state_growstack	// (lua_State *L, int n)
   |  ldr BASE, L->base
   |  cmp CARG1, CARG1			// Set zero-flag to force retry.
   |  b <1
   |
   |->fff_gcstep:			// Call GC step function.
   |  // BASE = new base, RC = nargs*8
   |   add CARG2, BASE, NARGS8:RC	// Calculate L->top.
   |  mov RA, lr
   |   stp BASE, CARG2, L->base
   |   str PC, SAVE_PC			// Redundant (but a defined value).
   |  mov CARG1, L
   |  bl extern lj_gc_step		// (lua_State *L)
   |  ldp BASE, CARG2, L->base
   |   ldr CFUNC:CARG3, [BASE, FRAME_FUNC]
   |  mov lr, RA				// Help return address predictor.
   |  sub NARGS8:RC, CARG2, BASE		// Calculate nargs*8.
   |   and CFUNC:CARG3, CARG3, #LJ_GCVMASK
   |  ret
   |
   |//-----------------------------------------------------------------------
   |//-- Special dispatch targets -------------------------------------------
   |//-----------------------------------------------------------------------
   |
   |->vm_record:				// Dispatch target for recording phase.
   |  NYI
   |
   |->vm_rethook:			// Dispatch target for return hooks.
   |  ldrb TMP2w, GL->hookmask
   |  tbz TMP2w, #HOOK_ACTIVE_SHIFT, >1	// Hook already active?
   |5:  // Re-dispatch to static ins.
   |  ldr TMP0, [TMP1, #GG_G2DISP+GG_DISP2STATIC]
   |  br TMP0
   |
   |->vm_inshook:			// Dispatch target for instr/line hooks.
   |  ldrb TMP2w, GL->hookmask
   |   ldr TMP3w, GL->hookcount
   |  tbnz TMP2w, #HOOK_ACTIVE_SHIFT, <5	// Hook already active?
   |  tst TMP2w, #LUA_MASKLINE|LUA_MASKCOUNT
   |  beq <5
   |   sub TMP3w, TMP3w, #1
   |   str TMP3w, GL->hookcount
   |   cbz TMP3w, >1
   |  tbz TMP2w, #LUA_HOOKLINE, <5
   |1:
   |  mov CARG1, L
   |   str BASE, L->base
   |  mov CARG2, PC
   |  // SAVE_PC must hold the _previous_ PC. The callee updates it with PC.
   |  bl extern lj_dispatch_ins		// (lua_State *L, const BCIns *pc)
   |3:
   |  ldr BASE, L->base
   |4:  // Re-dispatch to static ins.
   |  ldr INSw, [PC, #-4]
   |  add TMP1, GL, INS, uxtb #3
   |   decode_RA RA, INS
   |  ldr TMP0, [TMP1, #GG_G2DISP+GG_DISP2STATIC]
   |   decode_RD RC, INS
   |  br TMP0
   |
   |->cont_hook:				// Continue from hook yield.
   |  ldr CARG1, [CARG4, #-40]
   |   add PC, PC, #4
   |  str CARG1w, SAVE_MULTRES		// Restore MULTRES for *M ins.
   |  b <4
   |
   |->vm_hotloop:			// Hot loop counter underflow.
   |  NYI
   |
   |->vm_callhook:			// Dispatch target for call hooks.
   |  mov CARG2, PC
   |.if JIT
   |  b >1
   |.endif
   |
   |->vm_hotcall:			// Hot call counter underflow.
   |.if JIT
   |  orr CARG2, PC, #1
   |1:
   |.endif
   |  add TMP1, BASE, NARGS8:RC
   |   str PC, SAVE_PC
   |   mov CARG1, L
   |   sub RA, RA, BASE
   |  stp BASE, TMP1, L->base
   |  bl extern lj_dispatch_call		// (lua_State *L, const BCIns *pc)
   |  // Returns ASMFunction.
   |  ldp BASE, TMP1, L->base
   |   str xzr, SAVE_PC			// Invalidate for subsequent line hook.
   |  ldr LFUNC:CARG3, [BASE, FRAME_FUNC]
   |  add RA, BASE, RA
   |  sub NARGS8:RC, TMP1, BASE
   |   ldr INSw, [PC, #-4]
   |  and LFUNC:CARG3, CARG3, #LJ_GCVMASK
   |  br CRET1
   |
   |->cont_stitch:			// Trace stitching.
   |  NYI
   |
   |->vm_profhook:			// Dispatch target for profiler hook.
 #if LJ_HASPROFILE
   |  mov CARG1, L
   |   str BASE, L->base
   |  mov CARG2, PC
   |  bl extern lj_dispatch_profile	// (lua_State *L, const BCIns *pc)
   |  // HOOK_PROFILE is off again, so re-dispatch to dynamic instruction.
   |  ldr BASE, L->base
   |  sub PC, PC, #4
   |  b ->cont_nop
 #endif
   |
   |//-----------------------------------------------------------------------
   |//-- Trace exit handler -------------------------------------------------
   |//-----------------------------------------------------------------------
   |
   |->vm_exit_handler:
   |  NYI
   |->vm_exit_interp:
   |  NYI
   |
   |//-----------------------------------------------------------------------
   |//-- Math helper functions ----------------------------------------------
   |//-----------------------------------------------------------------------
   |
   |  // int lj_vm_modi(int dividend, int divisor);
   |->vm_modi:
   |    eor CARG4w, CARG1w, CARG2w
   |    cmp CARG4w, #0
   |  eor CARG3w, CARG1w, CARG1w, asr #31
   |   eor CARG4w, CARG2w, CARG2w, asr #31
   |  sub CARG3w, CARG3w, CARG1w, asr #31
   |   sub CARG4w, CARG4w, CARG2w, asr #31
   |  udiv CARG1w, CARG3w, CARG4w
   |  msub CARG1w, CARG1w, CARG4w, CARG3w
   |    ccmp CARG1w, #0, #4, mi
   |    sub CARG3w, CARG1w, CARG4w
   |    csel CARG1w, CARG1w, CARG3w, eq
   |  eor CARG3w, CARG1w, CARG2w
   |  cmp CARG3w, #0
   |  cneg CARG1w, CARG1w, mi
   |  ret
   |
   |//-----------------------------------------------------------------------
   |//-- Miscellaneous functions --------------------------------------------
   |//-----------------------------------------------------------------------
   |
   |//-----------------------------------------------------------------------
   |//-- FFI helper functions -----------------------------------------------
   |//-----------------------------------------------------------------------
   |
   |// Handler for callback functions.
   |// Saveregs already performed. Callback slot number in [sp], g in r12.
   |->vm_ffi_callback:
   |.if FFI
   |.type CTSTATE, CTState, PC
   |  saveregs
   |  ldr CTSTATE, GL:x10->ctype_state
   |  mov GL, x10
   |    add x10, sp, # CFRAME_SPACE
   |  str w9, CTSTATE->cb.slot
   |  stp x0, x1, CTSTATE->cb.gpr[0]
   |   stp d0, d1, CTSTATE->cb.fpr[0]
   |  stp x2, x3, CTSTATE->cb.gpr[2]
   |   stp d2, d3, CTSTATE->cb.fpr[2]
   |  stp x4, x5, CTSTATE->cb.gpr[4]
   |   stp d4, d5, CTSTATE->cb.fpr[4]
   |  stp x6, x7, CTSTATE->cb.gpr[6]
   |   stp d6, d7, CTSTATE->cb.fpr[6]
   |    str x10, CTSTATE->cb.stack
   |  mov CARG1, CTSTATE
   |   str CTSTATE, SAVE_PC		// Any value outside of bytecode is ok.
   |  mov CARG2, sp
   |  bl extern lj_ccallback_enter	// (CTState *cts, void *cf)
   |  // Returns lua_State *.
   |  ldp BASE, RC, L:CRET1->base
   |   movz TISNUM, #(LJ_TISNUM>>1)&0xffff, lsl #48
   |   movz TISNUMhi, #(LJ_TISNUM>>1)&0xffff, lsl #16
   |   movn TISNIL, #0
   |   mov L, CRET1
   |  ldr LFUNC:CARG3, [BASE, FRAME_FUNC]
   |  sub RC, RC, BASE
   |   st_vmstate ST_INTERP
   |  and LFUNC:CARG3, CARG3, #LJ_GCVMASK
   |  ins_callt
   |.endif
   |
   |->cont_ffi_callback:			// Return from FFI callback.
   |.if FFI
   |  ldr CTSTATE, GL->ctype_state
   |   stp BASE, CARG4, L->base
   |  str L, CTSTATE->L
   |  mov CARG1, CTSTATE
   |  mov CARG2, RA
   |  bl extern lj_ccallback_leave       // (CTState *cts, TValue *o)
   |  ldp x0, x1, CTSTATE->cb.gpr[0]
   |   ldp d0, d1, CTSTATE->cb.fpr[0]
   |  b ->vm_leave_unw
   |.endif
   |
   |->vm_ffi_call:			// Call C function via FFI.
   |  // Caveat: needs special frame unwinding, see below.
   |.if FFI
   |  .type CCSTATE, CCallState, x19
   |  stp fp, lr, [sp, #-32]!
   |  add fp, sp, #0
   |  str CCSTATE, [sp, #16]
   |  mov CCSTATE, x0
   |  ldr TMP0w, CCSTATE:x0->spadj
   |   ldrb TMP1w, CCSTATE->nsp
   |    add TMP2, CCSTATE, #offsetof(CCallState, stack)
   |   subs TMP1, TMP1, #1
   |    ldr TMP3, CCSTATE->func
   |  sub sp, fp, TMP0
   |   bmi >2
   |1:  // Copy stack slots
   |  ldr TMP0, [TMP2, TMP1, lsl #3]
   |  str TMP0, [sp, TMP1, lsl #3]
   |  subs TMP1, TMP1, #1
   |  bpl <1
   |2:
   |  ldp x0, x1, CCSTATE->gpr[0]
   |   ldp d0, d1, CCSTATE->fpr[0]
   |  ldp x2, x3, CCSTATE->gpr[2]
   |   ldp d2, d3, CCSTATE->fpr[2]
   |  ldp x4, x5, CCSTATE->gpr[4]
   |   ldp d4, d5, CCSTATE->fpr[4]
   |  ldp x6, x7, CCSTATE->gpr[6]
   |   ldp d6, d7, CCSTATE->fpr[6]
   |  ldr x8, CCSTATE->retp
   |  blr TMP3
   |  mov sp, fp
   |  stp x0, x1, CCSTATE->gpr[0]
   |   stp d0, d1, CCSTATE->fpr[0]
   |   stp d2, d3, CCSTATE->fpr[2]
   |  ldr CCSTATE, [sp, #16]
   |  ldp fp, lr, [sp], #32
   |  ret
   |.endif
   |// Note: vm_ffi_call must be the last function in this object file!
   |
   |//-----------------------------------------------------------------------
 }
 
 /* Generate the code for a single instruction. */
 static void build_ins(BuildCtx *ctx, BCOp op, int defop)
 {
   int vk = 0;
   |=>defop:
 
   switch (op) {
 
   /* -- Comparison ops ---------------------------------------------------- */
 
   /* Remember: all ops branch for a true comparison, fall through otherwise. */
 
   case BC_ISLT: case BC_ISGE: case BC_ISLE: case BC_ISGT:
     |  // RA = src1, RC = src2, JMP with RC = target
     |  ldr CARG1, [BASE, RA, lsl #3]
     |    ldrh RBw, [PC, #2]
     |   ldr CARG2, [BASE, RC, lsl #3]
     |    add PC, PC, #4
     |    add RB, PC, RB, lsl #2
     |    sub RB, RB, #0x20000
     |  checkint CARG1, >3
     |   checkint CARG2, >4
     |  cmp CARG1w, CARG2w
     if (op == BC_ISLT) {
       |  csel PC, RB, PC, lt
     } else if (op == BC_ISGE) {
       |  csel PC, RB, PC, ge
     } else if (op == BC_ISLE) {
       |  csel PC, RB, PC, le
     } else {
       |  csel PC, RB, PC, gt
     }
     |1:
     |  ins_next
     |
     |3:  // RA not int.
     |    ldr FARG1, [BASE, RA, lsl #3]
     |  blo ->vmeta_comp
     |    ldr FARG2, [BASE, RC, lsl #3]
     |   cmp TISNUMhi, CARG2, lsr #32
     |   bhi >5
     |   bne ->vmeta_comp
     |  // RA number, RC int.
     |  scvtf FARG2, CARG2w
     |  b >5
     |
     |4:  // RA int, RC not int
     |    ldr FARG2, [BASE, RC, lsl #3]
     |   blo ->vmeta_comp
     |  // RA int, RC number.
     |  scvtf FARG1, CARG1w
     |
     |5:  // RA number, RC number
     |  fcmp FARG1, FARG2
     |  // To preserve NaN semantics GE/GT branch on unordered, but LT/LE don't.
     if (op == BC_ISLT) {
       |  csel PC, RB, PC, lo
     } else if (op == BC_ISGE) {
       |  csel PC, RB, PC, hs
     } else if (op == BC_ISLE) {
       |  csel PC, RB, PC, ls
     } else {
       |  csel PC, RB, PC, hi
     }
     |  b <1
     break;
 
   case BC_ISEQV: case BC_ISNEV:
     vk = op == BC_ISEQV;
     |  // RA = src1, RC = src2, JMP with RC = target
     |  ldr CARG1, [BASE, RA, lsl #3]
     |   add RC, BASE, RC, lsl #3
     |    ldrh RBw, [PC, #2]
     |   ldr CARG3, [RC]
     |    add PC, PC, #4
     |    add RB, PC, RB, lsl #2
     |    sub RB, RB, #0x20000
     |  asr ITYPE, CARG3, #47
     |  cmn ITYPE, #-LJ_TISNUM
     if (vk) {
       |  bls ->BC_ISEQN_Z
     } else {
       |  bls ->BC_ISNEN_Z
     }
     |  // RC is not a number.
     |   asr TMP0, CARG1, #47
     |.if FFI
     |  // Check if RC or RA is a cdata.
     |  cmn ITYPE, #-LJ_TCDATA
     |   ccmn TMP0, #-LJ_TCDATA, #4, ne
     |  beq ->vmeta_equal_cd
     |.endif
     |  cmp CARG1, CARG3
     |  bne >2
     |  // Tag and value are equal.
     if (vk) {
       |->BC_ISEQV_Z:
       |  mov PC, RB			// Perform branch.
     }
     |1:
     |  ins_next
     |
     |2:  // Check if the tags are the same and it's a table or userdata.
     |  cmp ITYPE, TMP0
     |  ccmn ITYPE, #-LJ_TISTABUD, #2, eq
     if (vk) {
       |  bhi <1
     } else {
       |  bhi ->BC_ISEQV_Z		// Reuse code from opposite instruction.
     }
     |  // Different tables or userdatas. Need to check __eq metamethod.
     |  // Field metatable must be at same offset for GCtab and GCudata!
     |  and TAB:CARG2, CARG1, #LJ_GCVMASK
     |  ldr TAB:TMP2, TAB:CARG2->metatable
     if (vk) {
       |  cbz TAB:TMP2, <1		// No metatable?
       |  ldrb TMP1w, TAB:TMP2->nomm
       |   mov CARG4, #0			// ne = 0
       |  tbnz TMP1w, #MM_eq, <1		// 'no __eq' flag set: done.
     } else {
       |  cbz TAB:TMP2, ->BC_ISEQV_Z	// No metatable?
       |  ldrb TMP1w, TAB:TMP2->nomm
       |   mov CARG4, #1			// ne = 1.
       |  tbnz TMP1w, #MM_eq, ->BC_ISEQV_Z	// 'no __eq' flag set: done.
     }
     |  b ->vmeta_equal
     break;
 
   case BC_ISEQS: case BC_ISNES:
     vk = op == BC_ISEQS;
     |  // RA = src, RC = str_const (~), JMP with RC = target
     |  ldr CARG1, [BASE, RA, lsl #3]
     |   mvn RC, RC
     |    ldrh RBw, [PC, #2]
     |   ldr CARG2, [KBASE, RC, lsl #3]
     |    add PC, PC, #4
     |   movn TMP0, #~LJ_TSTR
     |.if FFI
     |  asr ITYPE, CARG1, #47
     |.endif
     |    add RB, PC, RB, lsl #2
     |   add CARG2, CARG2, TMP0, lsl #47
     |    sub RB, RB, #0x20000
     |.if FFI
     |  cmn ITYPE, #-LJ_TCDATA
     |  beq ->vmeta_equal_cd
     |.endif
     |  cmp CARG1, CARG2
     if (vk) {
       |  csel PC, RB, PC, eq
     } else {
       |  csel PC, RB, PC, ne
     }
     |  ins_next
     break;
 
   case BC_ISEQN: case BC_ISNEN:
     vk = op == BC_ISEQN;
     |  // RA = src, RC = num_const (~), JMP with RC = target
     |  ldr CARG1, [BASE, RA, lsl #3]
     |   add RC, KBASE, RC, lsl #3
     |    ldrh RBw, [PC, #2]
     |   ldr CARG3, [RC]
     |    add PC, PC, #4
     |    add RB, PC, RB, lsl #2
     |    sub RB, RB, #0x20000
     if (vk) {
       |->BC_ISEQN_Z:
     } else {
       |->BC_ISNEN_Z:
     }
     |  checkint CARG1, >4
     |   checkint CARG3, >6
     |  cmp CARG1w, CARG3w
     |1:
     if (vk) {
       |  csel PC, RB, PC, eq
       |2:
     } else {
       |2:
       |  csel PC, RB, PC, ne
     }
     |3:
     |  ins_next
     |
     |4:  // RA not int.
     |.if FFI
     |  blo >7
     |.else
     |  blo <2
     |.endif
     |    ldr FARG1, [BASE, RA, lsl #3]
     |    ldr FARG2, [RC]
     |   cmp TISNUMhi, CARG3, lsr #32
     |   bne >5
     |  // RA number, RC int.
     |  scvtf FARG2, CARG3w
     |5:
     |  // RA number, RC number.
     |  fcmp FARG1, FARG2
     |  b <1
     |
     |6:  // RA int, RC number
     |  ldr FARG2, [RC]
     |  scvtf FARG1, CARG1w
     |  fcmp FARG1, FARG2
     |  b <1
     |
     |.if FFI
     |7:
     |  asr ITYPE, CARG1, #47
     |  cmn ITYPE, #-LJ_TCDATA
     |  bne <2
     |  b ->vmeta_equal_cd
     |.endif
     break;
 
   case BC_ISEQP: case BC_ISNEP:
     vk = op == BC_ISEQP;
     |  // RA = src, RC = primitive_type (~), JMP with RC = target
     |  ldr TMP0, [BASE, RA, lsl #3]
     |   ldrh RBw, [PC, #2]
     |   add PC, PC, #4
     |  add RC, RC, #1
     |   add RB, PC, RB, lsl #2
     |.if FFI
     |  asr ITYPE, TMP0, #47
     |  cmn ITYPE, #-LJ_TCDATA
     |  beq ->vmeta_equal_cd
     |  cmn RC, ITYPE
     |.else
     |  cmn RC, TMP0, asr #47
     |.endif
     |   sub RB, RB, #0x20000
     if (vk) {
       |  csel PC, RB, PC, eq
     } else {
       |  csel PC, RB, PC, ne
     }
     |  ins_next
     break;
 
   /* -- Unary test and copy ops ------------------------------------------- */
 
   case BC_ISTC: case BC_ISFC: case BC_IST: case BC_ISF:
     |  // RA = dst or unused, RC = src, JMP with RC = target
     |   ldrh RBw, [PC, #2]
     |  ldr TMP0, [BASE, RC, lsl #3]
     |   add PC, PC, #4
     |  mov_false TMP1
     |   add RB, PC, RB, lsl #2
     |  cmp TMP0, TMP1
     |   sub RB, RB, #0x20000
     if (op == BC_ISTC || op == BC_IST) {
       if (op == BC_ISTC) {
 	|  csel RA, RA, RC, lo
       }
       |  csel PC, RB, PC, lo
     } else {
       if (op == BC_ISFC) {
 	|  csel RA, RA, RC, hs
       }
       |  csel PC, RB, PC, hs
     }
     if (op == BC_ISTC || op == BC_ISFC) {
       |  str TMP0, [BASE, RA, lsl #3]
     }
     |  ins_next
     break;
 
   case BC_ISTYPE:
     |  // RA = src, RC = -type
     |  ldr TMP0, [BASE, RA, lsl #3]
     |  cmn RC, TMP0, asr #47
     |  bne ->vmeta_istype
     |  ins_next
     break;
   case BC_ISNUM:
     |  // RA = src, RC = -(TISNUM-1)
     |  ldr TMP0, [BASE, RA]
     |  checknum TMP0, ->vmeta_istype
     |  ins_next
     break;
 
   /* -- Unary ops --------------------------------------------------------- */
 
   case BC_MOV:
     |  // RA = dst, RC = src
     |  ldr TMP0, [BASE, RC, lsl #3]
     |  str TMP0, [BASE, RA, lsl #3]
     |  ins_next
     break;
   case BC_NOT:
     |  // RA = dst, RC = src
     |  ldr TMP0, [BASE, RC, lsl #3]
     |   mov_false TMP1
     |   mov_true TMP2
     |  cmp TMP0, TMP1
     |  csel TMP0, TMP1, TMP2, lo
     |  str TMP0, [BASE, RA, lsl #3]
     |  ins_next
     break;
   case BC_UNM:
     |  // RA = dst, RC = src
     |  ldr TMP0, [BASE, RC, lsl #3]
     |  asr ITYPE, TMP0, #47
     |  cmn ITYPE, #-LJ_TISNUM
     |  bhi ->vmeta_unm
     |  eor TMP0, TMP0, #U64x(80000000,00000000)
     |  bne >5
     |  negs TMP0w, TMP0w
     |   movz CARG3, #0x41e0, lsl #48	// 2^31.
     |   add TMP0, TMP0, TISNUM
     |  csel TMP0, TMP0, CARG3, vc
     |5:
     |  str TMP0, [BASE, RA, lsl #3]
     |  ins_next
     break;
   case BC_LEN:
     |  // RA = dst, RC = src
     |  ldr CARG1, [BASE, RC, lsl #3]
     |  asr ITYPE, CARG1, #47
     |  cmn ITYPE, #-LJ_TSTR
     |   and CARG1, CARG1, #LJ_GCVMASK
     |  bne >2
     |  ldr CARG1w, STR:CARG1->len
     |1:
     |  add CARG1, CARG1, TISNUM
     |  str CARG1, [BASE, RA, lsl #3]
     |  ins_next
     |
     |2:
     |  cmn ITYPE, #-LJ_TTAB
     |  bne ->vmeta_len
 #if LJ_52
     |  ldr TAB:CARG2, TAB:CARG1->metatable
     |  cbnz TAB:CARG2, >9
     |3:
 #endif
     |->BC_LEN_Z:
     |  bl extern lj_tab_len		// (GCtab *t)
     |  // Returns uint32_t (but less than 2^31).
     |  b <1
     |
 #if LJ_52
     |9:
     |  ldrb TMP1w, TAB:CARG2->nomm
     |  tbnz TMP1w, #MM_len, <3		// 'no __len' flag set: done.
     |  b ->vmeta_len
 #endif
     break;
 
   /* -- Binary ops -------------------------------------------------------- */
 
     |.macro ins_arithcheck_int, target
     |  checkint CARG1, target
     |  checkint CARG2, target
     |.endmacro
     |
     |.macro ins_arithcheck_num, target
     |  checknum CARG1, target
     |  checknum CARG2, target
     |.endmacro
     |
     |.macro ins_arithcheck_nzdiv, target
     |  cbz CARG2w, target
     |.endmacro
     |
     |.macro ins_arithhead
     ||vk = ((int)op - BC_ADDVN) / (BC_ADDNV-BC_ADDVN);
     ||if (vk == 1) {
     |   and RC, RC, #255
     |    decode_RB RB, INS
     ||} else {
     |   decode_RB RB, INS
     |    and RC, RC, #255
     ||}
     |.endmacro
     |
     |.macro ins_arithload, reg1, reg2
     |  // RA = dst, RB = src1, RC = src2 | num_const
     ||switch (vk) {
     ||case 0:
     |   ldr reg1, [BASE, RB, lsl #3]
     |    ldr reg2, [KBASE, RC, lsl #3]
     ||  break;
     ||case 1:
     |   ldr reg1, [KBASE, RC, lsl #3]
     |    ldr reg2, [BASE, RB, lsl #3]
     ||  break;
     ||default:
     |   ldr reg1, [BASE, RB, lsl #3]
     |    ldr reg2, [BASE, RC, lsl #3]
     ||  break;
     ||}
     |.endmacro
     |
     |.macro ins_arithfallback, ins
     ||switch (vk) {
     ||case 0:
     |   ins ->vmeta_arith_vn
     ||  break;
     ||case 1:
     |   ins ->vmeta_arith_nv
     ||  break;
     ||default:
     |   ins ->vmeta_arith_vv
     ||  break;
     ||}
     |.endmacro
     |
     |.macro ins_arithmod, res, reg1, reg2
     |  fdiv d2, reg1, reg2
     |  frintm d2, d2
     |  fmsub res, d2, reg2, reg1
     |.endmacro
     |
     |.macro ins_arithdn, intins, fpins
     |  ins_arithhead
     |  ins_arithload CARG1, CARG2
     |  ins_arithcheck_int >5
     |.if "intins" == "smull"
     |  smull CARG1, CARG1w, CARG2w
     |  cmp CARG1, CARG1, sxtw
     |   mov CARG1w, CARG1w
     |  ins_arithfallback bne
     |.elif "intins" == "ins_arithmodi"
     |  ins_arithfallback ins_arithcheck_nzdiv
     |  bl ->vm_modi
     |.else
     |  intins CARG1w, CARG1w, CARG2w
     |  ins_arithfallback bvs
     |.endif
     |  add CARG1, CARG1, TISNUM
     |  str CARG1, [BASE, RA, lsl #3]
     |4:
     |  ins_next
     |
     |5:  // FP variant.
     |  ins_arithload FARG1, FARG2
     |  ins_arithfallback ins_arithcheck_num
     |  fpins FARG1, FARG1, FARG2
     |  str FARG1, [BASE, RA, lsl #3]
     |  b <4
     |.endmacro
     |
     |.macro ins_arithfp, fpins
     |  ins_arithhead
     |  ins_arithload CARG1, CARG2
     |  ins_arithload FARG1, FARG2
     |  ins_arithfallback ins_arithcheck_num
     |.if "fpins" == "fpow"
     |  bl extern pow
     |.else
     |  fpins FARG1, FARG1, FARG2
     |.endif
     |  str FARG1, [BASE, RA, lsl #3]
     |  ins_next
     |.endmacro
 
   case BC_ADDVN: case BC_ADDNV: case BC_ADDVV:
     |  ins_arithdn adds, fadd
     break;
   case BC_SUBVN: case BC_SUBNV: case BC_SUBVV:
     |  ins_arithdn subs, fsub
     break;
   case BC_MULVN: case BC_MULNV: case BC_MULVV:
     |  ins_arithdn smull, fmul
     break;
   case BC_DIVVN: case BC_DIVNV: case BC_DIVVV:
     |  ins_arithfp fdiv
     break;
   case BC_MODVN: case BC_MODNV: case BC_MODVV:
     |  ins_arithdn ins_arithmodi, ins_arithmod
     break;
   case BC_POW:
     |  // NYI: (partial) integer arithmetic.
     |  ins_arithfp fpow
     break;
 
   case BC_CAT:
     |  decode_RB RB, INS
     |   and RC, RC, #255
     |  // RA = dst, RB = src_start, RC = src_end
     |   str BASE, L->base
     |  sub CARG3, RC, RB
     |  add CARG2, BASE, RC, lsl #3
     |->BC_CAT_Z:
     |  // RA = dst, CARG2 = top-1, CARG3 = left
     |  mov CARG1, L
     |   str PC, SAVE_PC
     |  bl extern lj_meta_cat		// (lua_State *L, TValue *top, int left)
     |  // Returns NULL (finished) or TValue * (metamethod).
     |  ldrb RBw, [PC, #-1]
     |   ldr BASE, L->base
     |   cbnz CRET1, ->vmeta_binop
     |  ldr TMP0, [BASE, RB, lsl #3]
     |  str TMP0, [BASE, RA, lsl #3]	// Copy result to RA.
     |  ins_next
     break;
 
   /* -- Constant ops ------------------------------------------------------ */
 
   case BC_KSTR:
     |  // RA = dst, RC = str_const (~)
     |  mvn RC, RC
     |  ldr TMP0, [KBASE, RC, lsl #3]
     |   movn TMP1, #~LJ_TSTR
     |  add TMP0, TMP0, TMP1, lsl #47
     |  str TMP0, [BASE, RA, lsl #3]
     |  ins_next
     break;
   case BC_KCDATA:
     |.if FFI
     |  // RA = dst, RC = cdata_const (~)
     |  mvn RC, RC
     |  ldr TMP0, [KBASE, RC, lsl #3]
     |   movn TMP1, #~LJ_TCDATA
     |  add TMP0, TMP0, TMP1, lsl #47
     |  str TMP0, [BASE, RA, lsl #3]
     |  ins_next
     |.endif
     break;
   case BC_KSHORT:
     |  // RA = dst, RC = int16_literal
     |  sxth RCw, RCw
     |  add TMP0, RC, TISNUM
     |  str TMP0, [BASE, RA, lsl #3]
     |  ins_next
     break;
   case BC_KNUM:
     |  // RA = dst, RC = num_const
     |  ldr TMP0, [KBASE, RC, lsl #3]
     |  str TMP0, [BASE, RA, lsl #3]
     |  ins_next
     break;
   case BC_KPRI:
     |  // RA = dst, RC = primitive_type (~)
     |  mvn TMP0, RC, lsl #47
     |  str TMP0, [BASE, RA, lsl #3]
     |  ins_next
     break;
   case BC_KNIL:
     |  // RA = base, RC = end
     |  add RA, BASE, RA, lsl #3
     |   add RC, BASE, RC, lsl #3
     |  str TISNIL, [RA], #8
     |1:
     |   cmp RA, RC
     |  str TISNIL, [RA], #8
     |   blt <1
     |  ins_next_
     break;
 
   /* -- Upvalue and function ops ------------------------------------------ */
 
   case BC_UGET:
     |  // RA = dst, RC = uvnum
     |  ldr LFUNC:CARG2, [BASE, FRAME_FUNC]
     |   add RC, RC, #offsetof(GCfuncL, uvptr)/8
     |  and LFUNC:CARG2, CARG2, #LJ_GCVMASK
     |  ldr UPVAL:CARG2, [LFUNC:CARG2, RC, lsl #3]
     |  ldr CARG2, UPVAL:CARG2->v
     |  ldr TMP0, [CARG2]
     |  str TMP0, [BASE, RA, lsl #3]
     |  ins_next
     break;
   case BC_USETV:
     |  // RA = uvnum, RC = src
     |  ldr LFUNC:CARG2, [BASE, FRAME_FUNC]
     |   add RA, RA, #offsetof(GCfuncL, uvptr)/8
     |  and LFUNC:CARG2, CARG2, #LJ_GCVMASK
     |  ldr UPVAL:CARG1, [LFUNC:CARG2, RA, lsl #3]
     |   ldr CARG3, [BASE, RC, lsl #3]
     |    ldr CARG2, UPVAL:CARG1->v
     |  ldrb TMP2w, UPVAL:CARG1->marked
     |  ldrb TMP0w, UPVAL:CARG1->closed
     |    asr ITYPE, CARG3, #47
     |   str CARG3, [CARG2]
     |    add ITYPE, ITYPE, #-LJ_TISGCV
     |  tst TMP2w, #LJ_GC_BLACK		// isblack(uv)
     |  ccmp TMP0w, #0, #4, ne		// && uv->closed
     |    ccmn ITYPE, #-(LJ_TNUMX - LJ_TISGCV), #0, ne	// && tvisgcv(v)
     |  bhi >2
     |1:
     |  ins_next
     |
     |2:  // Check if new value is white.
     |  and GCOBJ:CARG3, CARG3, #LJ_GCVMASK
     |  ldrb TMP1w, GCOBJ:CARG3->gch.marked
     |  tst TMP1w, #LJ_GC_WHITES		// iswhite(str)
     |  beq <1
     |  // Crossed a write barrier. Move the barrier forward.
     |  mov CARG1, GL
     |  bl extern lj_gc_barrieruv	// (global_State *g, TValue *tv)
     |  b <1
     break;
   case BC_USETS:
     |  // RA = uvnum, RC = str_const (~)
     |  ldr LFUNC:CARG2, [BASE, FRAME_FUNC]
     |   add RA, RA, #offsetof(GCfuncL, uvptr)/8
     |    mvn RC, RC
     |  and LFUNC:CARG2, CARG2, #LJ_GCVMASK
     |  ldr UPVAL:CARG1, [LFUNC:CARG2, RA, lsl #3]
     |   ldr STR:CARG3, [KBASE, RC, lsl #3]
     |   movn TMP0, #~LJ_TSTR
     |    ldr CARG2, UPVAL:CARG1->v
     |  ldrb TMP2w, UPVAL:CARG1->marked
     |   add TMP0, STR:CARG3, TMP0, lsl #47
     |    ldrb TMP1w, STR:CARG3->marked
     |   str TMP0, [CARG2]
     |  tbnz TMP2w, #2, >2		// isblack(uv)
     |1:
     |  ins_next
     |
     |2:  // Check if string is white and ensure upvalue is closed.
     |  ldrb TMP0w, UPVAL:CARG1->closed
     |    tst TMP1w, #LJ_GC_WHITES	// iswhite(str)
     |  ccmp TMP0w, #0, #0, ne
     |  beq <1
     |  // Crossed a write barrier. Move the barrier forward.
     |  mov CARG1, GL
     |  bl extern lj_gc_barrieruv	// (global_State *g, TValue *tv)
     |  b <1
     break;
   case BC_USETN:
     |  // RA = uvnum, RC = num_const
     |  ldr LFUNC:CARG2, [BASE, FRAME_FUNC]
     |   add RA, RA, #offsetof(GCfuncL, uvptr)/8
     |  and LFUNC:CARG2, CARG2, #LJ_GCVMASK
     |  ldr UPVAL:CARG2, [LFUNC:CARG2, RA, lsl #3]
     |   ldr TMP0, [KBASE, RC, lsl #3]
     |  ldr CARG2, UPVAL:CARG2->v
     |   str TMP0, [CARG2]
     |  ins_next
     break;
   case BC_USETP:
     |  // RA = uvnum, RC = primitive_type (~)
     |  ldr LFUNC:CARG2, [BASE, FRAME_FUNC]
     |   add RA, RA, #offsetof(GCfuncL, uvptr)/8
     |  and LFUNC:CARG2, CARG2, #LJ_GCVMASK
     |  ldr UPVAL:CARG2, [LFUNC:CARG2, RA, lsl #3]
     |   mvn TMP0, RC, lsl #47
     |  ldr CARG2, UPVAL:CARG2->v
     |   str TMP0, [CARG2]
     |  ins_next
     break;
 
   case BC_UCLO:
     |  // RA = level, RC = target
     |  ldr CARG3, L->openupval
     |   add RC, PC, RC, lsl #2
     |    str BASE, L->base
     |   sub PC, RC, #0x20000
     |  cbz CARG3, >1
     |  mov CARG1, L
     |  add CARG2, BASE, RA, lsl #3
     |  bl extern lj_func_closeuv	// (lua_State *L, TValue *level)
     |  ldr BASE, L->base
     |1:
     |  ins_next
     break;
 
   case BC_FNEW:
     |  // RA = dst, RC = proto_const (~) (holding function prototype)
     |  mvn RC, RC
     |   str BASE, L->base
     |  ldr LFUNC:CARG3, [BASE, FRAME_FUNC]
     |    str PC, SAVE_PC
     |   ldr CARG2, [KBASE, RC, lsl #3]
     |    mov CARG1, L
     |  and LFUNC:CARG3, CARG3, #LJ_GCVMASK
     |  // (lua_State *L, GCproto *pt, GCfuncL *parent)
     |  bl extern lj_func_newL_gc
     |  // Returns GCfuncL *.
     |  ldr BASE, L->base
     |   movn TMP0, #~LJ_TFUNC
     |   add CRET1, CRET1, TMP0, lsl #47
     |  str CRET1, [BASE, RA, lsl #3]
     |  ins_next
     break;
 
   /* -- Table ops --------------------------------------------------------- */
 
   case BC_TNEW:
   case BC_TDUP:
     |  // RA = dst, RC = (hbits|asize) | tab_const (~)
     |  ldp CARG3, CARG4, GL->gc.total	// Assumes threshold follows total.
     |   str BASE, L->base
     |   str PC, SAVE_PC
     |   mov CARG1, L
     |  cmp CARG3, CARG4
     |  bhs >5
     |1:
     if (op == BC_TNEW) {
       |  and CARG2, RC, #0x7ff
       |   lsr CARG3, RC, #11
       |  cmp CARG2, #0x7ff
       |  mov TMP0, #0x801
       |  csel CARG2, CARG2, TMP0, ne
       |  bl extern lj_tab_new  // (lua_State *L, int32_t asize, uint32_t hbits)
       |  // Returns GCtab *.
     } else {
       |  mvn RC, RC
       |  ldr CARG2, [KBASE, RC, lsl #3]
       |  bl extern lj_tab_dup  // (lua_State *L, Table *kt)
       |  // Returns GCtab *.
     }
     |  ldr BASE, L->base
     |   movk CRET1, #(LJ_TTAB>>1)&0xffff, lsl #48
     |  str CRET1, [BASE, RA, lsl #3]
     |  ins_next
     |
     |5:
     |  bl extern lj_gc_step_fixtop  // (lua_State *L)
     |  mov CARG1, L
     |  b <1
     break;
 
   case BC_GGET:
     |  // RA = dst, RC = str_const (~)
   case BC_GSET:
     |  // RA = dst, RC = str_const (~)
     |  ldr LFUNC:CARG1, [BASE, FRAME_FUNC]
     |   mvn RC, RC
     |  and LFUNC:CARG1, CARG1, #LJ_GCVMASK
     |  ldr TAB:CARG2, LFUNC:CARG1->env
     |   ldr STR:RC, [KBASE, RC, lsl #3]
     if (op == BC_GGET) {
       |  b ->BC_TGETS_Z
     } else {
       |  b ->BC_TSETS_Z
     }
     break;
 
   case BC_TGETV:
     |  decode_RB RB, INS
     |   and RC, RC, #255
     |  // RA = dst, RB = table, RC = key
     |  ldr CARG2, [BASE, RB, lsl #3]
     |   ldr TMP1, [BASE, RC, lsl #3]
     |  checktab CARG2, ->vmeta_tgetv
     |  checkint TMP1, >9		// Integer key?
     |  ldr CARG3, TAB:CARG2->array
     |   ldr CARG1w, TAB:CARG2->asize
     |  add CARG3, CARG3, TMP1, uxtw #3
     |   cmp TMP1w, CARG1w		// In array part?
     |   bhs ->vmeta_tgetv
     |  ldr TMP0, [CARG3]
     |  cmp TMP0, TISNIL
     |  beq >5
     |1:
     |  str TMP0, [BASE, RA, lsl #3]
     |  ins_next
     |
     |5:  // Check for __index if table value is nil.
     |  ldr TAB:CARG1, TAB:CARG2->metatable
     |  cbz TAB:CARG1, <1		// No metatable: done.
     |  ldrb TMP1w, TAB:CARG1->nomm
     |  tbnz TMP1w, #MM_index, <1	// 'no __index' flag set: done.
     |  b ->vmeta_tgetv
     |
     |9:
     |  asr ITYPE, TMP1, #47
     |  cmn ITYPE, #-LJ_TSTR		// String key?
     |  bne ->vmeta_tgetv
     |   and STR:RC, TMP1, #LJ_GCVMASK
     |  b ->BC_TGETS_Z
     break;
   case BC_TGETS:
     |  decode_RB RB, INS
     |   and RC, RC, #255
     |  // RA = dst, RB = table, RC = str_const (~)
     |  ldr CARG2, [BASE, RB, lsl #3]
     |   mvn RC, RC
     |   ldr STR:RC, [KBASE, RC, lsl #3]
     |  checktab CARG2, ->vmeta_tgets1
     |->BC_TGETS_Z:
     |  // TAB:CARG2 = GCtab *, STR:RC = GCstr *, RA = dst
     |  ldr TMP1w, TAB:CARG2->hmask
     |   ldr TMP2w, STR:RC->hash
     |    ldr NODE:CARG3, TAB:CARG2->node
     |  and TMP1w, TMP1w, TMP2w		// idx = str->hash & tab->hmask
     |  add TMP1, TMP1, TMP1, lsl #1
     |  movn CARG4, #~LJ_TSTR
     |    add NODE:CARG3, NODE:CARG3, TMP1, lsl #3  // node = tab->node + idx*3*8
     |  add CARG4, STR:RC, CARG4, lsl #47	// Tagged key to look for.
     |1:
     |  ldp TMP0, CARG1, NODE:CARG3->val
     |   ldr NODE:CARG3, NODE:CARG3->next
     |  cmp CARG1, CARG4
     |  bne >4
     |  cmp TMP0, TISNIL
     |  beq >5
     |3:
     |  str TMP0, [BASE, RA, lsl #3]
     |  ins_next
     |
     |4:  // Follow hash chain.
     |  cbnz NODE:CARG3, <1
     |  // End of hash chain: key not found, nil result.
     |   mov TMP0, TISNIL
     |
     |5:  // Check for __index if table value is nil.
     |  ldr TAB:CARG1, TAB:CARG2->metatable
     |  cbz TAB:CARG1, <3		// No metatable: done.
     |  ldrb TMP1w, TAB:CARG1->nomm
     |  tbnz TMP1w, #MM_index, <3	// 'no __index' flag set: done.
     |  b ->vmeta_tgets
     break;
   case BC_TGETB:
     |  decode_RB RB, INS
     |   and RC, RC, #255
     |  // RA = dst, RB = table, RC = index
     |  ldr CARG2, [BASE, RB, lsl #3]
     |  checktab CARG2, ->vmeta_tgetb
     |  ldr CARG3, TAB:CARG2->array
     |   ldr CARG1w, TAB:CARG2->asize
     |  add CARG3, CARG3, RC, lsl #3
     |   cmp RCw, CARG1w			// In array part?
     |   bhs ->vmeta_tgetb
     |  ldr TMP0, [CARG3]
     |  cmp TMP0, TISNIL
     |  beq >5
     |1:
     |  str TMP0, [BASE, RA, lsl #3]
     |  ins_next
     |
     |5:  // Check for __index if table value is nil.
     |  ldr TAB:CARG1, TAB:CARG2->metatable
     |  cbz TAB:CARG1, <1		// No metatable: done.
     |  ldrb TMP1w, TAB:CARG1->nomm
     |  tbnz TMP1w, #MM_index, <1	// 'no __index' flag set: done.
     |  b ->vmeta_tgetb
     break;
   case BC_TGETR:
     |  decode_RB RB, INS
     |   and RC, RC, #255
     |  // RA = dst, RB = table, RC = key
     |  ldr CARG1, [BASE, RB, lsl #3]
     |   ldr TMP1, [BASE, RC, lsl #3]
     |  and TAB:CARG1, CARG1, #LJ_GCVMASK
     |  ldr CARG3, TAB:CARG1->array
     |   ldr TMP2w, TAB:CARG1->asize
     |  add CARG3, CARG3, TMP1w, uxtw #3
     |   cmp TMP1w, TMP2w		// In array part?
     |   bhs ->vmeta_tgetr
     |  ldr TMP0, [CARG3]
     |->BC_TGETR_Z:
     |  str TMP0, [BASE, RA, lsl #3]
     |  ins_next
     break;
 
   case BC_TSETV:
     |  decode_RB RB, INS
     |   and RC, RC, #255
     |  // RA = src, RB = table, RC = key
     |  ldr CARG2, [BASE, RB, lsl #3]
     |   ldr TMP1, [BASE, RC, lsl #3]
     |  checktab CARG2, ->vmeta_tsetv
     |  checkint TMP1, >9		// Integer key?
     |  ldr CARG3, TAB:CARG2->array
     |   ldr CARG1w, TAB:CARG2->asize
     |  add CARG3, CARG3, TMP1, uxtw #3
     |   cmp TMP1w, CARG1w		// In array part?
     |   bhs ->vmeta_tsetv
     |  ldr TMP1, [CARG3]
     |   ldr TMP0, [BASE, RA, lsl #3]
     |    ldrb TMP2w, TAB:CARG2->marked
     |  cmp TMP1, TISNIL			// Previous value is nil?
     |  beq >5
     |1:
     |   str TMP0, [CARG3]
     |    tbnz TMP2w, #2, >7		// isblack(table)
     |2:
     |   ins_next
     |
     |5:  // Check for __newindex if previous value is nil.
     |  ldr TAB:CARG1, TAB:CARG2->metatable
     |  cbz TAB:CARG1, <1		// No metatable: done.
     |  ldrb TMP1w, TAB:CARG1->nomm
     |  tbnz TMP1w, #MM_newindex, <1	// 'no __newindex' flag set: done.
     |  b ->vmeta_tsetv
     |
     |7:  // Possible table write barrier for the value. Skip valiswhite check.
     |  barrierback TAB:CARG2, TMP2w, TMP1
     |  b <2
     |
     |9:
     |  asr ITYPE, TMP1, #47
     |  cmn ITYPE, #-LJ_TSTR		// String key?
     |  bne ->vmeta_tsetv
     |   and STR:RC, TMP1, #LJ_GCVMASK
     |  b ->BC_TSETS_Z
     break;
   case BC_TSETS:
     |  decode_RB RB, INS
     |   and RC, RC, #255
     |  // RA = dst, RB = table, RC = str_const (~)
     |  ldr CARG2, [BASE, RB, lsl #3]
     |   mvn RC, RC
     |   ldr STR:RC, [KBASE, RC, lsl #3]
     |  checktab CARG2, ->vmeta_tsets1
     |->BC_TSETS_Z:
     |  // TAB:CARG2 = GCtab *, STR:RC = GCstr *, RA = src
     |  ldr TMP1w, TAB:CARG2->hmask
     |   ldr TMP2w, STR:RC->hash
     |    ldr NODE:CARG3, TAB:CARG2->node
     |  and TMP1w, TMP1w, TMP2w		// idx = str->hash & tab->hmask
     |  add TMP1, TMP1, TMP1, lsl #1
     |  movn CARG4, #~LJ_TSTR
     |    add NODE:CARG3, NODE:CARG3, TMP1, lsl #3  // node = tab->node + idx*3*8
     |  add CARG4, STR:RC, CARG4, lsl #47	// Tagged key to look for.
     |   strb wzr, TAB:CARG2->nomm	// Clear metamethod cache.
     |1:
     |  ldp TMP1, CARG1, NODE:CARG3->val
     |   ldr NODE:TMP3, NODE:CARG3->next
     |    ldrb TMP2w, TAB:CARG2->marked
     |  cmp CARG1, CARG4
     |  bne >5
     |   ldr TMP0, [BASE, RA, lsl #3]
     |  cmp TMP1, TISNIL			// Previous value is nil?
     |  beq >4
     |2:
     |   str TMP0, NODE:CARG3->val
     |    tbnz TMP2w, #2, >7		// isblack(table)
     |3:
     |  ins_next
     |
     |4:  // Check for __newindex if previous value is nil.
     |  ldr TAB:CARG1, TAB:CARG2->metatable
     |  cbz TAB:CARG1, <2		// No metatable: done.
     |  ldrb TMP1w, TAB:CARG1->nomm
     |  tbnz TMP1w, #MM_newindex, <2	// 'no __newindex' flag set: done.
     |  b ->vmeta_tsets
     |
     |5:  // Follow hash chain.
     |  mov NODE:CARG3, NODE:TMP3
     |  cbnz NODE:TMP3, <1
     |  // End of hash chain: key not found, add a new one.
     |
     |  // But check for __newindex first.
     |  ldr TAB:CARG1, TAB:CARG2->metatable
     |  cbz TAB:CARG1, >6		// No metatable: continue.
     |  ldrb TMP1w, TAB:CARG1->nomm
     |  // 'no __newindex' flag NOT set: check.
     |  tbz TMP1w, #MM_newindex, ->vmeta_tsets
     |6:
     |  movn TMP1, #~LJ_TSTR
     |   str PC, SAVE_PC
     |  add TMP0, STR:RC, TMP1, lsl #47
     |   str BASE, L->base
     |   mov CARG1, L
     |  str TMP0, TMPD
     |   add CARG3, sp, TMPDofs
     |  bl extern lj_tab_newkey		// (lua_State *L, GCtab *t, TValue *k)
     |  // Returns TValue *.
     |  ldr BASE, L->base
     |  ldr TMP0, [BASE, RA, lsl #3]
     |  str TMP0, [CRET1]
     |  b <3				// No 2nd write barrier needed.
     |
     |7:  // Possible table write barrier for the value. Skip valiswhite check.
     |  barrierback TAB:CARG2, TMP2w, TMP1
     |  b <3
     break;
   case BC_TSETB:
     |  decode_RB RB, INS
     |   and RC, RC, #255
     |  // RA = src, RB = table, RC = index
     |  ldr CARG2, [BASE, RB, lsl #3]
     |  checktab CARG2, ->vmeta_tsetb
     |  ldr CARG3, TAB:CARG2->array
     |   ldr CARG1w, TAB:CARG2->asize
     |  add CARG3, CARG3, RC, lsl #3
     |   cmp RCw, CARG1w			// In array part?
     |   bhs ->vmeta_tsetb
     |  ldr TMP1, [CARG3]
     |   ldr TMP0, [BASE, RA, lsl #3]
     |    ldrb TMP2w, TAB:CARG2->marked
     |  cmp TMP1, TISNIL			// Previous value is nil?
     |  beq >5
     |1:
     |   str TMP0, [CARG3]
     |    tbnz TMP2w, #2, >7		// isblack(table)
     |2:
     |   ins_next
     |
     |5:  // Check for __newindex if previous value is nil.
     |  ldr TAB:CARG1, TAB:CARG2->metatable
     |  cbz TAB:CARG1, <1		// No metatable: done.
     |  ldrb TMP1w, TAB:CARG1->nomm
     |  tbnz TMP1w, #MM_newindex, <1	// 'no __newindex' flag set: done.
     |  b ->vmeta_tsetb
     |
     |7:  // Possible table write barrier for the value. Skip valiswhite check.
     |  barrierback TAB:CARG2, TMP2w, TMP1
     |  b <2
     break;
   case BC_TSETR:
     |  decode_RB RB, INS
     |   and RC, RC, #255
     |  // RA = src, RB = table, RC = key
     |  ldr CARG2, [BASE, RB, lsl #3]
     |   ldr TMP1, [BASE, RC, lsl #3]
     |  and TAB:CARG2, CARG2, #LJ_GCVMASK
     |  ldr CARG1, TAB:CARG2->array
     |    ldrb TMP2w, TAB:CARG2->marked
     |   ldr CARG4w, TAB:CARG2->asize
     |  add CARG1, CARG1, TMP1, uxtw #3
     |    tbnz TMP2w, #2, >7		// isblack(table)
     |2:
     |   cmp TMP1w, CARG4w		// In array part?
     |   bhs ->vmeta_tsetr
     |->BC_TSETR_Z:
     |   ldr TMP0, [BASE, RA, lsl #3]
     |   str TMP0, [CARG1]
     |   ins_next
     |
     |7:  // Possible table write barrier for the value. Skip valiswhite check.
     |  barrierback TAB:CARG2, TMP2w, TMP0
     |  b <2
     break;
 
   case BC_TSETM:
     |  // RA = base (table at base-1), RC = num_const (start index)
     |  add RA, BASE, RA, lsl #3
     |1:
     |   ldr RBw, SAVE_MULTRES
     |  ldr TAB:CARG2, [RA, #-8]		// Guaranteed to be a table.
     |   ldr TMP1, [KBASE, RC, lsl #3]	// Integer constant is in lo-word.
     |    sub RB, RB, #8
     |    cbz RB, >4			// Nothing to copy?
     |  and TAB:CARG2, CARG2, #LJ_GCVMASK
     |  ldr CARG1w, TAB:CARG2->asize
     |   add CARG3w, TMP1w, RBw, lsr #3
     |   ldr CARG4, TAB:CARG2->array
     |  cmp CARG3, CARG1
     |    add RB, RA, RB
     |  bhi >5
     |   add TMP1, CARG4, TMP1w, uxtw #3
     |    ldrb TMP2w, TAB:CARG2->marked
     |3:  // Copy result slots to table.
     |   ldr TMP0, [RA], #8
     |   str TMP0, [TMP1], #8
     |  cmp RA, RB
     |  blo <3
     |    tbnz TMP2w, #2, >7		// isblack(table)
     |4:
     |  ins_next
     |
     |5:  // Need to resize array part.
     |   str BASE, L->base
     |  mov CARG1, L
     |   str PC, SAVE_PC
     |  bl extern lj_tab_reasize		// (lua_State *L, GCtab *t, int nasize)
     |  // Must not reallocate the stack.
     |  b <1
     |
     |7:  // Possible table write barrier for any value. Skip valiswhite check.
     |  barrierback TAB:CARG2, TMP2w, TMP1
     |  b <4
     break;
 
   /* -- Calls and vararg handling ----------------------------------------- */
 
   case BC_CALLM:
     |  // RA = base, (RB = nresults+1,) RC = extra_nargs
     |  ldr TMP0w, SAVE_MULTRES
     |  decode_RC8RD NARGS8:RC, RC
     |  add NARGS8:RC, NARGS8:RC, TMP0
     |  b ->BC_CALL_Z
     break;
   case BC_CALL:
     |  decode_RC8RD NARGS8:RC, RC
     |  // RA = base, (RB = nresults+1,) RC = (nargs+1)*8
     |->BC_CALL_Z:
     |  mov RB, BASE			// Save old BASE for vmeta_call.
     |  add BASE, BASE, RA, lsl #3
     |  ldr CARG3, [BASE]
     |   sub NARGS8:RC, NARGS8:RC, #8
     |   add BASE, BASE, #16
     |  checkfunc CARG3, ->vmeta_call
     |  ins_call
     break;
 
   case BC_CALLMT:
     |  // RA = base, (RB = 0,) RC = extra_nargs
     |  ldr TMP0w, SAVE_MULTRES
     |  add NARGS8:RC, TMP0, RC, lsl #3
     |  b ->BC_CALLT1_Z
     break;
   case BC_CALLT:
     |  lsl NARGS8:RC, RC, #3
     |  // RA = base, (RB = 0,) RC = (nargs+1)*8
     |->BC_CALLT1_Z:
     |  add RA, BASE, RA, lsl #3
     |  ldr TMP1, [RA]
     |   sub NARGS8:RC, NARGS8:RC, #8
     |   add RA, RA, #16
     |  checktp CARG3, TMP1, LJ_TFUNC, ->vmeta_callt
     |  ldr PC, [BASE, FRAME_PC]
     |->BC_CALLT2_Z:
     |   mov RB, #0
     |   ldrb TMP2w, LFUNC:CARG3->ffid
     |  tst PC, #FRAME_TYPE
     |  bne >7
     |1:
     |  str TMP1, [BASE, FRAME_FUNC]	// Copy function down, but keep PC.
     |  cbz NARGS8:RC, >3
     |2:
     |  ldr TMP0, [RA, RB]
     |   add TMP1, RB, #8
     |   cmp TMP1, NARGS8:RC
     |  str TMP0, [BASE, RB]
     |    mov RB, TMP1
     |   bne <2
     |3:
     |  cmp TMP2, #1			// (> FF_C) Calling a fast function?
     |  bhi >5
     |4:
     |  ins_callt
     |
     |5:  // Tailcall to a fast function with a Lua frame below.
     |  ldrb RAw, [PC, #-3]
     |  sub CARG1, BASE, RA, lsl #3
     |  ldr LFUNC:CARG1, [CARG1, #-32]
     |  and LFUNC:CARG1, CARG1, #LJ_GCVMASK
     |  ldr CARG1, LFUNC:CARG1->pc
     |  ldr KBASE, [CARG1, #PC2PROTO(k)]
     |  b <4
     |
     |7:  // Tailcall from a vararg function.
     |  eor PC, PC, #FRAME_VARG
     |  tst PC, #FRAME_TYPEP		// Vararg frame below?
     |  csel TMP2, RB, TMP2, ne		// Clear ffid if no Lua function below.
     |  bne <1
     |  sub BASE, BASE, PC
     |  ldr PC, [BASE, FRAME_PC]
     |  tst PC, #FRAME_TYPE
     |  csel TMP2, RB, TMP2, ne		// Clear ffid if no Lua function below.
     |  b <1
     break;
 
   case BC_ITERC:
     |  // RA = base, (RB = nresults+1, RC = nargs+1 (2+1))
     |  add RA, BASE, RA, lsl #3
     |  ldr CARG3, [RA, #-24]
     |    mov RB, BASE			// Save old BASE for vmeta_call.
     |   ldp CARG1, CARG2, [RA, #-16]
     |    add BASE, RA, #16
     |    mov NARGS8:RC, #16		// Iterators get 2 arguments.
     |  str CARG3, [RA]			// Copy callable.
     |   stp CARG1, CARG2, [RA, #16]	// Copy state and control var.
     |  checkfunc CARG3, ->vmeta_call
     |  ins_call
     break;
 
   case BC_ITERN:
     |  // RA = base, (RB = nresults+1, RC = nargs+1 (2+1))
     |.if JIT
     |  // NYI: add hotloop, record BC_ITERN.
     |.endif
     |  add RA, BASE, RA, lsl #3
     |  ldr TAB:RB, [RA, #-16]
     |    ldrh TMP3w, [PC, #2]
     |  ldr CARG1w, [RA, #-8]		// Get index from control var.
     |    add PC, PC, #4
     |    add TMP3, PC, TMP3, lsl #2
     |  and TAB:RB, RB, #LJ_GCVMASK
     |    sub TMP3, TMP3, #0x20000
     |  ldr TMP1w, TAB:RB->asize
     |   ldr CARG2, TAB:RB->array
     |1:  // Traverse array part.
     |  subs RC, CARG1, TMP1
     |   add CARG3, CARG2, CARG1, lsl #3
     |  bhs >5				// Index points after array part?
     |   ldr TMP0, [CARG3]
     |   cmp TMP0, TISNIL
     |   cinc CARG1, CARG1, eq		// Skip holes in array part.
     |   beq <1
     |   add CARG1, CARG1, TISNUM
     |   stp CARG1, TMP0, [RA]
     |    add CARG1, CARG1, #1
     |3:
     |    str CARG1w, [RA, #-8]		// Update control var.
     |  mov PC, TMP3
     |4:
     |  ins_next
     |
     |5:  // Traverse hash part.
     |  ldr TMP2w, TAB:RB->hmask
     |   ldr NODE:RB, TAB:RB->node
     |6:
     |   add CARG1, RC, RC, lsl #1
     |  cmp RC, TMP2			// End of iteration? Branch to ITERN+1.
     |   add NODE:CARG3, NODE:RB, CARG1, lsl #3  // node = tab->node + idx*3*8
     |  bhi <4
     |  ldp TMP0, CARG1, NODE:CARG3->val
     |  cmp TMP0, TISNIL
     |   add RC, RC, #1
     |  beq <6				// Skip holes in hash part.
     |  stp CARG1, TMP0, [RA]
     |  add CARG1, RC, TMP1
     |  b <3
     break;
 
   case BC_ISNEXT:
     |  // RA = base, RC = target (points to ITERN)
     |  add RA, BASE, RA, lsl #3
     |  ldr CFUNC:CARG1, [RA, #-24]
     |     add RC, PC, RC, lsl #2
     |   ldp TAB:CARG3, CARG4, [RA, #-16]
     |     sub RC, RC, #0x20000
     |  checkfunc CFUNC:CARG1, >5
     |   asr TMP0, TAB:CARG3, #47
     |  ldrb TMP1w, CFUNC:CARG1->ffid
     |   cmn TMP0, #-LJ_TTAB
     |   ccmp CARG4, TISNIL, #0, eq
     |  ccmp TMP1w, #FF_next_N, #0, eq
     |  bne >5
     |  mov TMP0w, #0xfffe7fff
     |  lsl TMP0, TMP0, #32
     |  str TMP0, [RA, #-8]		// Initialize control var.
     |1:
     |     mov PC, RC
     |  ins_next
     |
     |5:  // Despecialize bytecode if any of the checks fail.
     |  mov TMP0, #BC_JMP
     |   mov TMP1, #BC_ITERC
     |  strb TMP0w, [PC, #-4]
     |   strb TMP1w, [RC]
     |  b <1
     break;
 
   case BC_VARG:
     |  decode_RB RB, INS
     |   and RC, RC, #255
     |  // RA = base, RB = (nresults+1), RC = numparams
     |  ldr TMP1, [BASE, FRAME_PC]
     |  add RC, BASE, RC, lsl #3
     |   add RA, BASE, RA, lsl #3
     |  add RC, RC, #FRAME_VARG
     |   add TMP2, RA, RB, lsl #3
     |  sub RC, RC, TMP1			// RC = vbase
     |  // Note: RC may now be even _above_ BASE if nargs was < numparams.
     |   sub TMP3, BASE, #16		// TMP3 = vtop
     |  cbz RB, >5
     |   sub TMP2, TMP2, #16
     |1:  // Copy vararg slots to destination slots.
     |  cmp RC, TMP3
     |  ldr TMP0, [RC], #8
     |  csel TMP0, TMP0, TISNIL, lo
     |   cmp RA, TMP2
     |  str TMP0, [RA], #8
     |   blo <1
     |2:
     |  ins_next
     |
     |5:  // Copy all varargs.
     |  ldr TMP0, L->maxstack
     |   subs TMP2, TMP3, RC
     |   csel RB, xzr, TMP2, le		// MULTRES = (max(vtop-vbase,0)+1)*8
     |   add RB, RB, #8
     |  add TMP1, RA, TMP2
     |   str RBw, SAVE_MULTRES
     |   ble <2				// Nothing to copy.
     |  cmp TMP1, TMP0
     |  bhi >7
     |6:
     |  ldr TMP0, [RC], #8
     |  str TMP0, [RA], #8
     |  cmp RC, TMP3
     |  blo <6
     |  b <2
     |
     |7:  // Grow stack for varargs.
     |  lsr CARG2, TMP2, #3
     |   stp BASE, RA, L->base
     |  mov CARG1, L
     |  sub RC, RC, BASE			// Need delta, because BASE may change.
     |   str PC, SAVE_PC
     |  bl extern lj_state_growstack	// (lua_State *L, int n)
     |  ldp BASE, RA, L->base
     |  add RC, BASE, RC
     |  sub TMP3, BASE, #16
     |  b <6
     break;
 
   /* -- Returns ----------------------------------------------------------- */
 
   case BC_RETM:
     |  // RA = results, RC = extra results
     |  ldr TMP0w, SAVE_MULTRES
     |   ldr PC, [BASE, FRAME_PC]
     |    add RA, BASE, RA, lsl #3
     |  add RC, TMP0, RC, lsl #3
     |  b ->BC_RETM_Z
     break;
 
   case BC_RET:
     |  // RA = results, RC = nresults+1
     |  ldr PC, [BASE, FRAME_PC]
     |   lsl RC, RC, #3
     |    add RA, BASE, RA, lsl #3
     |->BC_RETM_Z:
     |   str RCw, SAVE_MULTRES
     |1:
     |  ands CARG1, PC, #FRAME_TYPE
     |   eor CARG2, PC, #FRAME_VARG
     |  bne ->BC_RETV2_Z
     |
     |->BC_RET_Z:
     |  // BASE = base, RA = resultptr, RC = (nresults+1)*8, PC = return
     |  ldr INSw, [PC, #-4]
     |  subs TMP1, RC, #8
     |   sub CARG3, BASE, #16
     |  beq >3
     |2:
     |  ldr TMP0, [RA], #8
     |   add BASE, BASE, #8
     |   sub TMP1, TMP1, #8
     |  str TMP0, [BASE, #-24]
     |   cbnz TMP1, <2
     |3:
     |  decode_RA RA, INS
     |  sub CARG4, CARG3, RA, lsl #3
     |   decode_RB RB, INS
     |  ldr LFUNC:CARG1, [CARG4, FRAME_FUNC]
     |5:
     |  cmp RC, RB, lsl #3		// More results expected?
     |  blo >6
     |  and LFUNC:CARG1, CARG1, #LJ_GCVMASK
     |  mov BASE, CARG4
     |  ldr CARG2, LFUNC:CARG1->pc
     |  ldr KBASE, [CARG2, #PC2PROTO(k)]
     |   ins_next
     |
     |6:  // Fill up results with nil.
     |  add BASE, BASE, #8
     |   add RC, RC, #8
     |  str TISNIL, [BASE, #-24]
     |  b <5
     |
     |->BC_RETV1_Z:  // Non-standard return case.
     |  add RA, BASE, RA, lsl #3
     |->BC_RETV2_Z:
     |  tst CARG2, #FRAME_TYPEP
     |  bne ->vm_return
     |  // Return from vararg function: relocate BASE down.
     |  sub BASE, BASE, CARG2
     |  ldr PC, [BASE, FRAME_PC]
     |  b <1
     break;
 
   case BC_RET0: case BC_RET1:
     |  // RA = results, RC = nresults+1
     |  ldr PC, [BASE, FRAME_PC]
     |   lsl RC, RC, #3
     |   str RCw, SAVE_MULTRES
     |  ands CARG1, PC, #FRAME_TYPE
     |   eor CARG2, PC, #FRAME_VARG
     |  bne ->BC_RETV1_Z
     |   ldr INSw, [PC, #-4]
     if (op == BC_RET1) {
       |  ldr TMP0, [BASE, RA, lsl #3]
     }
     |  sub CARG4, BASE, #16
     |   decode_RA RA, INS
     |  sub BASE, CARG4, RA, lsl #3
     if (op == BC_RET1) {
       |  str TMP0, [CARG4], #8
     }
     |   decode_RB RB, INS
     |  ldr LFUNC:CARG1, [BASE, FRAME_FUNC]
     |5:
     |  cmp RC, RB, lsl #3
     |  blo >6
     |  and LFUNC:CARG1, CARG1, #LJ_GCVMASK
     |  ldr CARG2, LFUNC:CARG1->pc
     |  ldr KBASE, [CARG2, #PC2PROTO(k)]
     |  ins_next
     |
     |6:  // Fill up results with nil.
     |  add RC, RC, #8
     |  str TISNIL, [CARG4], #8
     |  b <5
     break;
 
   /* -- Loops and branches ------------------------------------------------ */
 
   |.define FOR_IDX,  [RA];      .define FOR_TIDX,  [RA, #4]
   |.define FOR_STOP, [RA, #8];  .define FOR_TSTOP, [RA, #12]
   |.define FOR_STEP, [RA, #16]; .define FOR_TSTEP, [RA, #20]
   |.define FOR_EXT,  [RA, #24]; .define FOR_TEXT,  [RA, #28]
 
   case BC_FORL:
     |.if JIT
     |  hotloop
     |.endif
     |  // Fall through. Assumes BC_IFORL follows.
     break;
 
   case BC_JFORI:
   case BC_JFORL:
 #if !LJ_HASJIT
     break;
 #endif
   case BC_FORI:
   case BC_IFORL:
     |  // RA = base, RC = target (after end of loop or start of loop)
     vk = (op == BC_IFORL || op == BC_JFORL);
     |  add RA, BASE, RA, lsl #3
     |  ldp CARG1, CARG2, FOR_IDX		// CARG1 = IDX, CARG2 = STOP
     |   ldr CARG3, FOR_STEP			// CARG3 = STEP
     if (op != BC_JFORL) {
       |   add RC, PC, RC, lsl #2
       |   sub RC, RC, #0x20000
     }
     |  checkint CARG1, >5
     if (!vk) {
       |  checkint CARG2, ->vmeta_for
       |   checkint CARG3, ->vmeta_for
       |  tbnz CARG3w, #31, >4
       |  cmp CARG1w, CARG2w
     } else {
       |  adds CARG1w, CARG1w, CARG3w
       |  bvs >2
       |   add TMP0, CARG1, TISNUM
       |  tbnz CARG3w, #31, >4
       |  cmp CARG1w, CARG2w
     }
     |1:
     if (op == BC_FORI) {
       |  csel PC, RC, PC, gt
     } else if (op == BC_JFORI) {
       |  ldrh RCw, [RC, #-2]
     } else if (op == BC_IFORL) {
       |  csel PC, RC, PC, le
     }
     if (vk) {
       |   str TMP0, FOR_IDX
       |   str TMP0, FOR_EXT
     } else {
       |  str CARG1, FOR_EXT
     }
     if (op == BC_JFORI || op == BC_JFORL) {
       |  ble =>BC_JLOOP
     }
     |2:
     |   ins_next
     |
     |4:  // Invert check for negative step.
     |  cmp CARG2w, CARG1w
     |  b <1
     |
     |5:  // FP loop.
     |  ldp d0, d1, FOR_IDX
     |  blo ->vmeta_for
     if (!vk) {
       |  checknum CARG2, ->vmeta_for
       |   checknum CARG3, ->vmeta_for
       |  str d0, FOR_EXT
     } else {
       |  ldr d2, FOR_STEP
       |  fadd d0, d0, d2
     }
     |  tbnz CARG3, #63, >7
     |  fcmp d0, d1
     |6:
     if (vk) {
       |  str d0, FOR_IDX
       |  str d0, FOR_EXT
     }
     if (op == BC_FORI) {
       |  csel PC, RC, PC, hi
     } else if (op == BC_JFORI) {
       |  ldrh RCw, [RC, #-2]
       |  bls =>BC_JLOOP
     } else if (op == BC_IFORL) {
       |  csel PC, RC, PC, ls
     } else {
       |  bls =>BC_JLOOP
     }
     |  b <2
     |
     |7:  // Invert check for negative step.
     |  fcmp d1, d0
     |  b <6
     break;
 
   case BC_ITERL:
     |.if JIT
     |  hotloop
     |.endif
     |  // Fall through. Assumes BC_IITERL follows.
     break;
 
   case BC_JITERL:
 #if !LJ_HASJIT
     break;
 #endif
   case BC_IITERL:
     |  // RA = base, RC = target
     |  ldr CARG1, [BASE, RA, lsl #3]
     |   add TMP1, BASE, RA, lsl #3
     |  cmp CARG1, TISNIL
     |  beq >1				// Stop if iterator returned nil.
     if (op == BC_JITERL) {
       |  str CARG1, [TMP1, #-8]
       |  b =>BC_JLOOP
     } else {
       |  add TMP0, PC, RC, lsl #2	// Otherwise save control var + branch.
       |  sub PC, TMP0, #0x20000
       |  str CARG1, [TMP1, #-8]
     }
     |1:
     |  ins_next
     break;
 
   case BC_LOOP:
     |  // RA = base, RC = target (loop extent)
     |  // Note: RA/RC is only used by trace recorder to determine scope/extent
     |  // This opcode does NOT jump, it's only purpose is to detect a hot loop.
     |.if JIT
     |  hotloop
     |.endif
     |  // Fall through. Assumes BC_ILOOP follows.
     break;
 
   case BC_ILOOP:
     |  // RA = base, RC = target (loop extent)
     |  ins_next
     break;
 
   case BC_JLOOP:
     |.if JIT
     |  NYI
     |.endif
     break;
 
   case BC_JMP:
     |  // RA = base (only used by trace recorder), RC = target
     |  add RC, PC, RC, lsl #2
     |  sub PC, RC, #0x20000
     |  ins_next
     break;
 
   /* -- Function headers -------------------------------------------------- */
 
   case BC_FUNCF:
     |.if JIT
     |  hotcall
     |.endif
   case BC_FUNCV:  /* NYI: compiled vararg functions. */
     |  // Fall through. Assumes BC_IFUNCF/BC_IFUNCV follow.
     break;
 
   case BC_JFUNCF:
 #if !LJ_HASJIT
     break;
 #endif
   case BC_IFUNCF:
     |  // BASE = new base, RA = BASE+framesize*8, CARG3 = LFUNC, RC = nargs*8
     |  ldr CARG1, L->maxstack
     |   ldrb TMP1w, [PC, #-4+PC2PROTO(numparams)]
     |    ldr KBASE, [PC, #-4+PC2PROTO(k)]
     |  cmp RA, CARG1
     |  bhi ->vm_growstack_l
     |2:
     |  cmp NARGS8:RC, TMP1, lsl #3	// Check for missing parameters.
     |  blo >3
     if (op == BC_JFUNCF) {
       |  decode_RD RC, INS
       |  b =>BC_JLOOP
     } else {
       |  ins_next
     }
     |
     |3:  // Clear missing parameters.
     |  str TISNIL, [BASE, NARGS8:RC]
     |  add NARGS8:RC, NARGS8:RC, #8
     |  b <2
     break;
 
   case BC_JFUNCV:
 #if !LJ_HASJIT
     break;
 #endif
     |  NYI  // NYI: compiled vararg functions
     break;  /* NYI: compiled vararg functions. */
 
   case BC_IFUNCV:
     |  // BASE = new base, RA = BASE+framesize*8, CARG3 = LFUNC, RC = nargs*8
     |  ldr CARG1, L->maxstack
     |   add TMP2, BASE, RC
     |  add RA, RA, RC
     |   add TMP0, RC, #16+FRAME_VARG
     |   str LFUNC:CARG3, [TMP2], #8	// Store (untagged) copy of LFUNC.
     |    ldr KBASE, [PC, #-4+PC2PROTO(k)]
     |  cmp RA, CARG1
     |   str TMP0, [TMP2], #8		// Store delta + FRAME_VARG.
     |  bhs ->vm_growstack_l
     |   sub RC, TMP2, #16
     |  ldrb TMP1w, [PC, #-4+PC2PROTO(numparams)]
     |   mov RA, BASE
     |   mov BASE, TMP2
     |  cbz TMP1, >2
     |1:
     |  cmp RA, RC			// Less args than parameters?
     |  bhs >3
     |   ldr TMP0, [RA]
     |  sub TMP1, TMP1, #1
     |    str TISNIL, [RA], #8		// Clear old fixarg slot (help the GC).
     |   str TMP0, [TMP2], #8
     |  cbnz TMP1, <1
     |2:
     |  ins_next
     |
     |3:
     |  sub TMP1, TMP1, #1
     |   str TISNIL, [TMP2], #8
     |  cbz TMP1, <2
     |  b <3
     break;
 
   case BC_FUNCC:
   case BC_FUNCCW:
     |  // BASE = new base, RA = BASE+framesize*8, CARG3 = CFUNC, RC = nargs*8
     if (op == BC_FUNCC) {
       |  ldr CARG4, CFUNC:CARG3->f
     } else {
       |  ldr CARG4, GL->wrapf
     }
     |   add CARG2, RA, NARGS8:RC
     |   ldr CARG1, L->maxstack
     |  add RC, BASE, NARGS8:RC
     |   cmp CARG2, CARG1
     |  stp BASE, RC, L->base
     if (op == BC_FUNCCW) {
       |  ldr CARG2, CFUNC:CARG3->f
     }
     |    mv_vmstate TMP0w, C
     |  mov CARG1, L
     |   bhi ->vm_growstack_c		// Need to grow stack.
     |    st_vmstate TMP0w
     |  blr CARG4			// (lua_State *L [, lua_CFunction f])
     |  // Returns nresults.
     |  ldp BASE, TMP1, L->base
     |    str L, GL->cur_L
     |   sbfiz RC, CRET1, #3, #32
     |    st_vmstate ST_INTERP
     |  ldr PC, [BASE, FRAME_PC]
     |   sub RA, TMP1, RC		// RA = L->top - nresults*8
     |  b ->vm_returnc
     break;
 
   /* ---------------------------------------------------------------------- */
 
   default:
     fprintf(stderr, "Error: undefined opcode BC_%s\n", bc_names[op]);
     exit(2);
     break;
   }
 }
 
 static int build_backend(BuildCtx *ctx)
 {
   int op;
 
   dasm_growpc(Dst, BC__MAX);
 
   build_subroutines(ctx);
 
   |.code_op
   for (op = 0; op < BC__MAX; op++)
     build_ins(ctx, (BCOp)op, op);
 
   return BC__MAX;
 }
 
 /* Emit pseudo frame-info for all assembler functions. */
 static void emit_asm_debug(BuildCtx *ctx)
 {
   int fcofs = (int)((uint8_t *)ctx->glob[GLOB_vm_ffi_call] - ctx->code);
   int i, cf = CFRAME_SIZE >> 3;
   switch (ctx->mode) {
   case BUILD_elfasm:
     fprintf(ctx->fp, "\t.section .debug_frame,\"\",%%progbits\n");
     fprintf(ctx->fp,
 	".Lframe0:\n"
 	"\t.long .LECIE0-.LSCIE0\n"
 	".LSCIE0:\n"
 	"\t.long 0xffffffff\n"
 	"\t.byte 0x1\n"
 	"\t.string \"\"\n"
 	"\t.uleb128 0x1\n"
 	"\t.sleb128 -8\n"
 	"\t.byte 30\n"				/* Return address is in lr. */
 	"\t.byte 0xc\n\t.uleb128 31\n\t.uleb128 0\n"	/* def_cfa sp */
 	"\t.align 3\n"
 	".LECIE0:\n\n");
     fprintf(ctx->fp,
 	".LSFDE0:\n"
 	"\t.long .LEFDE0-.LASFDE0\n"
 	".LASFDE0:\n"
 	"\t.long .Lframe0\n"
 	"\t.quad .Lbegin\n"
 	"\t.quad %d\n"
 	"\t.byte 0xe\n\t.uleb128 %d\n"		/* def_cfa_offset */
 	"\t.byte 0x9d\n\t.uleb128 %d\n"		/* offset fp */
 	"\t.byte 0x9e\n\t.uleb128 %d\n",	/* offset lr */
 	fcofs, CFRAME_SIZE, cf, cf-1);
     for (i = 19; i <= 28; i++)  /* offset x19-x28 */
       fprintf(ctx->fp, "\t.byte 0x%x\n\t.uleb128 %d\n", 0x80+i, cf-i+17);
     for (i = 8; i <= 15; i++)  /* offset d8-d15 */
       fprintf(ctx->fp, "\t.byte 5\n\t.uleb128 0x%x\n\t.uleb128 %d\n",
 	      64+i, cf-i-4);
     fprintf(ctx->fp,
 	"\t.align 3\n"
 	".LEFDE0:\n\n");
 #if LJ_HASFFI
     fprintf(ctx->fp,
 	".LSFDE1:\n"
 	"\t.long .LEFDE1-.LASFDE1\n"
 	".LASFDE1:\n"
 	"\t.long .Lframe0\n"
 	"\t.quad lj_vm_ffi_call\n"
 	"\t.quad %d\n"
 	"\t.byte 0xe\n\t.uleb128 32\n"		/* def_cfa_offset */
 	"\t.byte 0x9d\n\t.uleb128 4\n"		/* offset fp */
 	"\t.byte 0x9e\n\t.uleb128 3\n"		/* offset lr */
 	"\t.byte 0x93\n\t.uleb128 2\n"		/* offset x19 */
 	"\t.align 3\n"
 	".LEFDE1:\n\n", (int)ctx->codesz - fcofs);
 #endif
     fprintf(ctx->fp, "\t.section .eh_frame,\"a\",%%progbits\n");
     fprintf(ctx->fp,
 	".Lframe1:\n"
 	"\t.long .LECIE1-.LSCIE1\n"
 	".LSCIE1:\n"
 	"\t.long 0\n"
 	"\t.byte 0x1\n"
 	"\t.string \"zPR\"\n"
 	"\t.uleb128 0x1\n"
 	"\t.sleb128 -8\n"
 	"\t.byte 30\n"				/* Return address is in lr. */
 	"\t.uleb128 6\n"			/* augmentation length */
 	"\t.byte 0x1b\n"			/* pcrel|sdata4 */
 	"\t.long lj_err_unwind_dwarf-.\n"
 	"\t.byte 0x1b\n"			/* pcrel|sdata4 */
 	"\t.byte 0xc\n\t.uleb128 31\n\t.uleb128 0\n"	/* def_cfa sp */
 	"\t.align 3\n"
 	".LECIE1:\n\n");
     fprintf(ctx->fp,
 	".LSFDE2:\n"
 	"\t.long .LEFDE2-.LASFDE2\n"
 	".LASFDE2:\n"
 	"\t.long .LASFDE2-.Lframe1\n"
 	"\t.long .Lbegin-.\n"
 	"\t.long %d\n"
 	"\t.uleb128 0\n"			/* augmentation length */
 	"\t.byte 0xe\n\t.uleb128 %d\n"		/* def_cfa_offset */
 	"\t.byte 0x9d\n\t.uleb128 %d\n"		/* offset fp */
 	"\t.byte 0x9e\n\t.uleb128 %d\n",	/* offset lr */
 	fcofs, CFRAME_SIZE, cf, cf-1);
     for (i = 19; i <= 28; i++)  /* offset x19-x28 */
       fprintf(ctx->fp, "\t.byte 0x%x\n\t.uleb128 %d\n", 0x80+i, cf-i+17);
     for (i = 8; i <= 15; i++)  /* offset d8-d15 */
       fprintf(ctx->fp, "\t.byte 5\n\t.uleb128 0x%x\n\t.uleb128 %d\n",
 	      64+i, cf-i-4);
     fprintf(ctx->fp,
 	"\t.align 3\n"
 	".LEFDE2:\n\n");
 #if LJ_HASFFI
     fprintf(ctx->fp,
 	".Lframe2:\n"
 	"\t.long .LECIE2-.LSCIE2\n"
 	".LSCIE2:\n"
 	"\t.long 0\n"
 	"\t.byte 0x1\n"
 	"\t.string \"zR\"\n"
 	"\t.uleb128 0x1\n"
 	"\t.sleb128 -8\n"
 	"\t.byte 30\n"				/* Return address is in lr. */
 	"\t.uleb128 1\n"                        /* augmentation length */
 	"\t.byte 0x1b\n"                        /* pcrel|sdata4 */
 	"\t.byte 0xc\n\t.uleb128 31\n\t.uleb128 0\n"	/* def_cfa sp */
 	"\t.align 3\n"
 	".LECIE2:\n\n");
     fprintf(ctx->fp,
 	".LSFDE3:\n"
 	"\t.long .LEFDE3-.LASFDE3\n"
 	".LASFDE3:\n"
 	"\t.long .LASFDE3-.Lframe2\n"
 	"\t.long lj_vm_ffi_call-.\n"
 	"\t.long %d\n"
 	"\t.uleb128 0\n"                        /* augmentation length */
 	"\t.byte 0xe\n\t.uleb128 32\n"		/* def_cfa_offset */
 	"\t.byte 0x9d\n\t.uleb128 4\n"		/* offset fp */
 	"\t.byte 0x9e\n\t.uleb128 3\n"		/* offset lr */
 	"\t.byte 0x93\n\t.uleb128 2\n"		/* offset x19 */
 	"\t.align 3\n"
 	".LEFDE3:\n\n", (int)ctx->codesz - fcofs);
 #endif
     break;
   default:
     break;
   }
 }