qemu

fpu_helper.c (17227B)

---

 /*
  * RISC-V FPU Emulation Helpers for QEMU.
  *
  * Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2 or later, as published by the Free Software Foundation.
  *
  * This program is distributed in the hope it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  *
  * You should have received a copy of the GNU General Public License along with
  * this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include "qemu/osdep.h"
 #include "cpu.h"
 #include "qemu/host-utils.h"
 #include "exec/exec-all.h"
 #include "exec/helper-proto.h"
 #include "fpu/softfloat.h"
 #include "internals.h"
 
 target_ulong riscv_cpu_get_fflags(CPURISCVState *env)
 {
     int soft = get_float_exception_flags(&env->fp_status);
     target_ulong hard = 0;
 
     hard |= (soft & float_flag_inexact) ? FPEXC_NX : 0;
     hard |= (soft & float_flag_underflow) ? FPEXC_UF : 0;
     hard |= (soft & float_flag_overflow) ? FPEXC_OF : 0;
     hard |= (soft & float_flag_divbyzero) ? FPEXC_DZ : 0;
     hard |= (soft & float_flag_invalid) ? FPEXC_NV : 0;
 
     return hard;
 }
 
 void riscv_cpu_set_fflags(CPURISCVState *env, target_ulong hard)
 {
     int soft = 0;
 
     soft |= (hard & FPEXC_NX) ? float_flag_inexact : 0;
     soft |= (hard & FPEXC_UF) ? float_flag_underflow : 0;
     soft |= (hard & FPEXC_OF) ? float_flag_overflow : 0;
     soft |= (hard & FPEXC_DZ) ? float_flag_divbyzero : 0;
     soft |= (hard & FPEXC_NV) ? float_flag_invalid : 0;
 
     set_float_exception_flags(soft, &env->fp_status);
 }
 
 void helper_set_rounding_mode(CPURISCVState *env, uint32_t rm)
 {
     int softrm;
 
     if (rm == RISCV_FRM_DYN) {
         rm = env->frm;
     }
     switch (rm) {
     case RISCV_FRM_RNE:
         softrm = float_round_nearest_even;
         break;
     case RISCV_FRM_RTZ:
         softrm = float_round_to_zero;
         break;
     case RISCV_FRM_RDN:
         softrm = float_round_down;
         break;
     case RISCV_FRM_RUP:
         softrm = float_round_up;
         break;
     case RISCV_FRM_RMM:
         softrm = float_round_ties_away;
         break;
     default:
         riscv_raise_exception(env, RISCV_EXCP_ILLEGAL_INST, GETPC());
     }
 
     set_float_rounding_mode(softrm, &env->fp_status);
 }
 
 void helper_set_rod_rounding_mode(CPURISCVState *env)
 {
     set_float_rounding_mode(float_round_to_odd, &env->fp_status);
 }
 
 static uint64_t do_fmadd_h(CPURISCVState *env, uint64_t rs1, uint64_t rs2,
                            uint64_t rs3, int flags)
 {
     float16 frs1 = check_nanbox_h(env, rs1);
     float16 frs2 = check_nanbox_h(env, rs2);
     float16 frs3 = check_nanbox_h(env, rs3);
     return nanbox_h(env, float16_muladd(frs1, frs2, frs3, flags,
                                         &env->fp_status));
 }
 
 static uint64_t do_fmadd_s(CPURISCVState *env, uint64_t rs1, uint64_t rs2,
                            uint64_t rs3, int flags)
 {
     float32 frs1 = check_nanbox_s(env, rs1);
     float32 frs2 = check_nanbox_s(env, rs2);
     float32 frs3 = check_nanbox_s(env, rs3);
     return nanbox_s(env, float32_muladd(frs1, frs2, frs3, flags,
                                         &env->fp_status));
 }
 
 uint64_t helper_fmadd_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
                         uint64_t frs3)
 {
     return do_fmadd_s(env, frs1, frs2, frs3, 0);
 }
 
 uint64_t helper_fmadd_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
                         uint64_t frs3)
 {
     return float64_muladd(frs1, frs2, frs3, 0, &env->fp_status);
 }
 
 uint64_t helper_fmadd_h(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
                         uint64_t frs3)
 {
     return do_fmadd_h(env, frs1, frs2, frs3, 0);
 }
 
 uint64_t helper_fmsub_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
                         uint64_t frs3)
 {
     return do_fmadd_s(env, frs1, frs2, frs3, float_muladd_negate_c);
 }
 
 uint64_t helper_fmsub_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
                         uint64_t frs3)
 {
     return float64_muladd(frs1, frs2, frs3, float_muladd_negate_c,
                           &env->fp_status);
 }
 
 uint64_t helper_fmsub_h(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
                         uint64_t frs3)
 {
     return do_fmadd_h(env, frs1, frs2, frs3, float_muladd_negate_c);
 }
 
 uint64_t helper_fnmsub_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
                          uint64_t frs3)
 {
     return do_fmadd_s(env, frs1, frs2, frs3, float_muladd_negate_product);
 }
 
 uint64_t helper_fnmsub_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
                          uint64_t frs3)
 {
     return float64_muladd(frs1, frs2, frs3, float_muladd_negate_product,
                           &env->fp_status);
 }
 
 uint64_t helper_fnmsub_h(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
                          uint64_t frs3)
 {
     return do_fmadd_h(env, frs1, frs2, frs3, float_muladd_negate_product);
 }
 
 uint64_t helper_fnmadd_s(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
                          uint64_t frs3)
 {
     return do_fmadd_s(env, frs1, frs2, frs3,
                       float_muladd_negate_c | float_muladd_negate_product);
 }
 
 uint64_t helper_fnmadd_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
                          uint64_t frs3)
 {
     return float64_muladd(frs1, frs2, frs3, float_muladd_negate_c |
                           float_muladd_negate_product, &env->fp_status);
 }
 
 uint64_t helper_fnmadd_h(CPURISCVState *env, uint64_t frs1, uint64_t frs2,
                          uint64_t frs3)
 {
     return do_fmadd_h(env, frs1, frs2, frs3,
                       float_muladd_negate_c | float_muladd_negate_product);
 }
 
 uint64_t helper_fadd_s(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
 {
     float32 frs1 = check_nanbox_s(env, rs1);
     float32 frs2 = check_nanbox_s(env, rs2);
     return nanbox_s(env, float32_add(frs1, frs2, &env->fp_status));
 }
 
 uint64_t helper_fsub_s(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
 {
     float32 frs1 = check_nanbox_s(env, rs1);
     float32 frs2 = check_nanbox_s(env, rs2);
     return nanbox_s(env, float32_sub(frs1, frs2, &env->fp_status));
 }
 
 uint64_t helper_fmul_s(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
 {
     float32 frs1 = check_nanbox_s(env, rs1);
     float32 frs2 = check_nanbox_s(env, rs2);
     return nanbox_s(env, float32_mul(frs1, frs2, &env->fp_status));
 }
 
 uint64_t helper_fdiv_s(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
 {
     float32 frs1 = check_nanbox_s(env, rs1);
     float32 frs2 = check_nanbox_s(env, rs2);
     return nanbox_s(env, float32_div(frs1, frs2, &env->fp_status));
 }
 
 uint64_t helper_fmin_s(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
 {
     float32 frs1 = check_nanbox_s(env, rs1);
     float32 frs2 = check_nanbox_s(env, rs2);
     return nanbox_s(env, env->priv_ver < PRIV_VERSION_1_11_0 ?
                     float32_minnum(frs1, frs2, &env->fp_status) :
                     float32_minimum_number(frs1, frs2, &env->fp_status));
 }
 
 uint64_t helper_fmax_s(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
 {
     float32 frs1 = check_nanbox_s(env, rs1);
     float32 frs2 = check_nanbox_s(env, rs2);
     return nanbox_s(env, env->priv_ver < PRIV_VERSION_1_11_0 ?
                     float32_maxnum(frs1, frs2, &env->fp_status) :
                     float32_maximum_number(frs1, frs2, &env->fp_status));
 }
 
 uint64_t helper_fsqrt_s(CPURISCVState *env, uint64_t rs1)
 {
     float32 frs1 = check_nanbox_s(env, rs1);
     return nanbox_s(env, float32_sqrt(frs1, &env->fp_status));
 }
 
 target_ulong helper_fle_s(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
 {
     float32 frs1 = check_nanbox_s(env, rs1);
     float32 frs2 = check_nanbox_s(env, rs2);
     return float32_le(frs1, frs2, &env->fp_status);
 }
 
 target_ulong helper_flt_s(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
 {
     float32 frs1 = check_nanbox_s(env, rs1);
     float32 frs2 = check_nanbox_s(env, rs2);
     return float32_lt(frs1, frs2, &env->fp_status);
 }
 
 target_ulong helper_feq_s(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
 {
     float32 frs1 = check_nanbox_s(env, rs1);
     float32 frs2 = check_nanbox_s(env, rs2);
     return float32_eq_quiet(frs1, frs2, &env->fp_status);
 }
 
 target_ulong helper_fcvt_w_s(CPURISCVState *env, uint64_t rs1)
 {
     float32 frs1 = check_nanbox_s(env, rs1);
     return float32_to_int32(frs1, &env->fp_status);
 }
 
 target_ulong helper_fcvt_wu_s(CPURISCVState *env, uint64_t rs1)
 {
     float32 frs1 = check_nanbox_s(env, rs1);
     return (int32_t)float32_to_uint32(frs1, &env->fp_status);
 }
 
 target_ulong helper_fcvt_l_s(CPURISCVState *env, uint64_t rs1)
 {
     float32 frs1 = check_nanbox_s(env, rs1);
     return float32_to_int64(frs1, &env->fp_status);
 }
 
 target_ulong helper_fcvt_lu_s(CPURISCVState *env, uint64_t rs1)
 {
     float32 frs1 = check_nanbox_s(env, rs1);
     return float32_to_uint64(frs1, &env->fp_status);
 }
 
 uint64_t helper_fcvt_s_w(CPURISCVState *env, target_ulong rs1)
 {
     return nanbox_s(env, int32_to_float32((int32_t)rs1, &env->fp_status));
 }
 
 uint64_t helper_fcvt_s_wu(CPURISCVState *env, target_ulong rs1)
 {
     return nanbox_s(env, uint32_to_float32((uint32_t)rs1, &env->fp_status));
 }
 
 uint64_t helper_fcvt_s_l(CPURISCVState *env, target_ulong rs1)
 {
     return nanbox_s(env, int64_to_float32(rs1, &env->fp_status));
 }
 
 uint64_t helper_fcvt_s_lu(CPURISCVState *env, target_ulong rs1)
 {
     return nanbox_s(env, uint64_to_float32(rs1, &env->fp_status));
 }
 
 target_ulong helper_fclass_s(CPURISCVState *env, uint64_t rs1)
 {
     float32 frs1 = check_nanbox_s(env, rs1);
     return fclass_s(frs1);
 }
 
 uint64_t helper_fadd_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
 {
     return float64_add(frs1, frs2, &env->fp_status);
 }
 
 uint64_t helper_fsub_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
 {
     return float64_sub(frs1, frs2, &env->fp_status);
 }
 
 uint64_t helper_fmul_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
 {
     return float64_mul(frs1, frs2, &env->fp_status);
 }
 
 uint64_t helper_fdiv_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
 {
     return float64_div(frs1, frs2, &env->fp_status);
 }
 
 uint64_t helper_fmin_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
 {
     return env->priv_ver < PRIV_VERSION_1_11_0 ?
             float64_minnum(frs1, frs2, &env->fp_status) :
             float64_minimum_number(frs1, frs2, &env->fp_status);
 }
 
 uint64_t helper_fmax_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
 {
     return env->priv_ver < PRIV_VERSION_1_11_0 ?
             float64_maxnum(frs1, frs2, &env->fp_status) :
             float64_maximum_number(frs1, frs2, &env->fp_status);
 }
 
 uint64_t helper_fcvt_s_d(CPURISCVState *env, uint64_t rs1)
 {
     return nanbox_s(env, float64_to_float32(rs1, &env->fp_status));
 }
 
 uint64_t helper_fcvt_d_s(CPURISCVState *env, uint64_t rs1)
 {
     float32 frs1 = check_nanbox_s(env, rs1);
     return float32_to_float64(frs1, &env->fp_status);
 }
 
 uint64_t helper_fsqrt_d(CPURISCVState *env, uint64_t frs1)
 {
     return float64_sqrt(frs1, &env->fp_status);
 }
 
 target_ulong helper_fle_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
 {
     return float64_le(frs1, frs2, &env->fp_status);
 }
 
 target_ulong helper_flt_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
 {
     return float64_lt(frs1, frs2, &env->fp_status);
 }
 
 target_ulong helper_feq_d(CPURISCVState *env, uint64_t frs1, uint64_t frs2)
 {
     return float64_eq_quiet(frs1, frs2, &env->fp_status);
 }
 
 target_ulong helper_fcvt_w_d(CPURISCVState *env, uint64_t frs1)
 {
     return float64_to_int32(frs1, &env->fp_status);
 }
 
 target_ulong helper_fcvt_wu_d(CPURISCVState *env, uint64_t frs1)
 {
     return (int32_t)float64_to_uint32(frs1, &env->fp_status);
 }
 
 target_ulong helper_fcvt_l_d(CPURISCVState *env, uint64_t frs1)
 {
     return float64_to_int64(frs1, &env->fp_status);
 }
 
 target_ulong helper_fcvt_lu_d(CPURISCVState *env, uint64_t frs1)
 {
     return float64_to_uint64(frs1, &env->fp_status);
 }
 
 uint64_t helper_fcvt_d_w(CPURISCVState *env, target_ulong rs1)
 {
     return int32_to_float64((int32_t)rs1, &env->fp_status);
 }
 
 uint64_t helper_fcvt_d_wu(CPURISCVState *env, target_ulong rs1)
 {
     return uint32_to_float64((uint32_t)rs1, &env->fp_status);
 }
 
 uint64_t helper_fcvt_d_l(CPURISCVState *env, target_ulong rs1)
 {
     return int64_to_float64(rs1, &env->fp_status);
 }
 
 uint64_t helper_fcvt_d_lu(CPURISCVState *env, target_ulong rs1)
 {
     return uint64_to_float64(rs1, &env->fp_status);
 }
 
 target_ulong helper_fclass_d(uint64_t frs1)
 {
     return fclass_d(frs1);
 }
 
 uint64_t helper_fadd_h(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
 {
     float16 frs1 = check_nanbox_h(env, rs1);
     float16 frs2 = check_nanbox_h(env, rs2);
     return nanbox_h(env, float16_add(frs1, frs2, &env->fp_status));
 }
 
 uint64_t helper_fsub_h(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
 {
     float16 frs1 = check_nanbox_h(env, rs1);
     float16 frs2 = check_nanbox_h(env, rs2);
     return nanbox_h(env, float16_sub(frs1, frs2, &env->fp_status));
 }
 
 uint64_t helper_fmul_h(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
 {
     float16 frs1 = check_nanbox_h(env, rs1);
     float16 frs2 = check_nanbox_h(env, rs2);
     return nanbox_h(env, float16_mul(frs1, frs2, &env->fp_status));
 }
 
 uint64_t helper_fdiv_h(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
 {
     float16 frs1 = check_nanbox_h(env, rs1);
     float16 frs2 = check_nanbox_h(env, rs2);
     return nanbox_h(env, float16_div(frs1, frs2, &env->fp_status));
 }
 
 uint64_t helper_fmin_h(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
 {
     float16 frs1 = check_nanbox_h(env, rs1);
     float16 frs2 = check_nanbox_h(env, rs2);
     return nanbox_h(env, env->priv_ver < PRIV_VERSION_1_11_0 ?
                     float16_minnum(frs1, frs2, &env->fp_status) :
                     float16_minimum_number(frs1, frs2, &env->fp_status));
 }
 
 uint64_t helper_fmax_h(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
 {
     float16 frs1 = check_nanbox_h(env, rs1);
     float16 frs2 = check_nanbox_h(env, rs2);
     return nanbox_h(env, env->priv_ver < PRIV_VERSION_1_11_0 ?
                     float16_maxnum(frs1, frs2, &env->fp_status) :
                     float16_maximum_number(frs1, frs2, &env->fp_status));
 }
 
 uint64_t helper_fsqrt_h(CPURISCVState *env, uint64_t rs1)
 {
     float16 frs1 = check_nanbox_h(env, rs1);
     return nanbox_h(env, float16_sqrt(frs1, &env->fp_status));
 }
 
 target_ulong helper_fle_h(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
 {
     float16 frs1 = check_nanbox_h(env, rs1);
     float16 frs2 = check_nanbox_h(env, rs2);
     return float16_le(frs1, frs2, &env->fp_status);
 }
 
 target_ulong helper_flt_h(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
 {
     float16 frs1 = check_nanbox_h(env, rs1);
     float16 frs2 = check_nanbox_h(env, rs2);
     return float16_lt(frs1, frs2, &env->fp_status);
 }
 
 target_ulong helper_feq_h(CPURISCVState *env, uint64_t rs1, uint64_t rs2)
 {
     float16 frs1 = check_nanbox_h(env, rs1);
     float16 frs2 = check_nanbox_h(env, rs2);
     return float16_eq_quiet(frs1, frs2, &env->fp_status);
 }
 
 target_ulong helper_fclass_h(CPURISCVState *env, uint64_t rs1)
 {
     float16 frs1 = check_nanbox_h(env, rs1);
     return fclass_h(frs1);
 }
 
 target_ulong helper_fcvt_w_h(CPURISCVState *env, uint64_t rs1)
 {
     float16 frs1 = check_nanbox_h(env, rs1);
     return float16_to_int32(frs1, &env->fp_status);
 }
 
 target_ulong helper_fcvt_wu_h(CPURISCVState *env, uint64_t rs1)
 {
     float16 frs1 = check_nanbox_h(env, rs1);
     return (int32_t)float16_to_uint32(frs1, &env->fp_status);
 }
 
 target_ulong helper_fcvt_l_h(CPURISCVState *env, uint64_t rs1)
 {
     float16 frs1 = check_nanbox_h(env, rs1);
     return float16_to_int64(frs1, &env->fp_status);
 }
 
 target_ulong helper_fcvt_lu_h(CPURISCVState *env, uint64_t rs1)
 {
     float16 frs1 = check_nanbox_h(env, rs1);
     return float16_to_uint64(frs1, &env->fp_status);
 }
 
 uint64_t helper_fcvt_h_w(CPURISCVState *env, target_ulong rs1)
 {
     return nanbox_h(env, int32_to_float16((int32_t)rs1, &env->fp_status));
 }
 
 uint64_t helper_fcvt_h_wu(CPURISCVState *env, target_ulong rs1)
 {
     return nanbox_h(env, uint32_to_float16((uint32_t)rs1, &env->fp_status));
 }
 
 uint64_t helper_fcvt_h_l(CPURISCVState *env, target_ulong rs1)
 {
     return nanbox_h(env, int64_to_float16(rs1, &env->fp_status));
 }
 
 uint64_t helper_fcvt_h_lu(CPURISCVState *env, target_ulong rs1)
 {
     return nanbox_h(env, uint64_to_float16(rs1, &env->fp_status));
 }
 
 uint64_t helper_fcvt_h_s(CPURISCVState *env, uint64_t rs1)
 {
     float32 frs1 = check_nanbox_s(env, rs1);
     return nanbox_h(env, float32_to_float16(frs1, true, &env->fp_status));
 }
 
 uint64_t helper_fcvt_s_h(CPURISCVState *env, uint64_t rs1)
 {
     float16 frs1 = check_nanbox_h(env, rs1);
     return nanbox_s(env, float16_to_float32(frs1, true, &env->fp_status));
 }
 
 uint64_t helper_fcvt_h_d(CPURISCVState *env, uint64_t rs1)
 {
     return nanbox_h(env, float64_to_float16(rs1, true, &env->fp_status));
 }
 
 uint64_t helper_fcvt_d_h(CPURISCVState *env, uint64_t rs1)
 {
     float16 frs1 = check_nanbox_h(env, rs1);
     return float16_to_float64(frs1, true, &env->fp_status);
 }