fpu_helper.h (1829B)
1 /* 2 * Helpers for emulation of FPU-related MIPS instructions. 3 * 4 * Copyright (C) 2004-2005 Jocelyn Mayer 5 * 6 * SPDX-License-Identifier: LGPL-2.1-or-later 7 */ 8 #include "fpu/softfloat-helpers.h" 9 #include "cpu.h" 10 11 extern const FloatRoundMode ieee_rm[4]; 12 13 uint32_t float_class_s(uint32_t arg, float_status *fst); 14 uint64_t float_class_d(uint64_t arg, float_status *fst); 15 16 static inline void restore_rounding_mode(CPUMIPSState *env) 17 { 18 set_float_rounding_mode(ieee_rm[env->active_fpu.fcr31 & 3], 19 &env->active_fpu.fp_status); 20 } 21 22 static inline void restore_flush_mode(CPUMIPSState *env) 23 { 24 set_flush_to_zero((env->active_fpu.fcr31 & (1 << FCR31_FS)) != 0, 25 &env->active_fpu.fp_status); 26 } 27 28 static inline void restore_snan_bit_mode(CPUMIPSState *env) 29 { 30 bool nan2008 = env->active_fpu.fcr31 & (1 << FCR31_NAN2008); 31 32 /* 33 * With nan2008, SNaNs are silenced in the usual way. 34 * Before that, SNaNs are not silenced; default nans are produced. 35 */ 36 set_snan_bit_is_one(!nan2008, &env->active_fpu.fp_status); 37 set_default_nan_mode(!nan2008, &env->active_fpu.fp_status); 38 } 39 40 static inline void restore_fp_status(CPUMIPSState *env) 41 { 42 restore_rounding_mode(env); 43 restore_flush_mode(env); 44 restore_snan_bit_mode(env); 45 } 46 47 /* MSA */ 48 49 enum CPUMIPSMSADataFormat { 50 DF_BYTE = 0, 51 DF_HALF, 52 DF_WORD, 53 DF_DOUBLE 54 }; 55 56 static inline void restore_msa_fp_status(CPUMIPSState *env) 57 { 58 float_status *status = &env->active_tc.msa_fp_status; 59 int rounding_mode = (env->active_tc.msacsr & MSACSR_RM_MASK) >> MSACSR_RM; 60 bool flush_to_zero = (env->active_tc.msacsr & MSACSR_FS_MASK) != 0; 61 62 set_float_rounding_mode(ieee_rm[rounding_mode], status); 63 set_flush_to_zero(flush_to_zero, status); 64 set_flush_inputs_to_zero(flush_to_zero, status); 65 }