diff options
Diffstat (limited to 'target-i386')
| -rw-r--r-- | target-i386/helper.h | 1 | ||||
| -rw-r--r-- | target-i386/op_helper.c | 64 | ||||
| -rw-r--r-- | target-i386/translate.c | 2 |
3 files changed, 56 insertions, 11 deletions
diff --git a/target-i386/helper.h b/target-i386/helper.h index 6b518ad89f..761954e925 100644 --- a/target-i386/helper.h +++ b/target-i386/helper.h @@ -197,6 +197,7 @@ DEF_HELPER_2(lzcnt, tl, tl, int) /* MMX/SSE */ +DEF_HELPER_1(ldmxcsr, void, i32) DEF_HELPER_0(enter_mmx, void) DEF_HELPER_0(emms, void) DEF_HELPER_2(movq, void, ptr, ptr) diff --git a/target-i386/op_helper.c b/target-i386/op_helper.c index c89e4a49db..2aea71bf85 100644 --- a/target-i386/op_helper.c +++ b/target-i386/op_helper.c @@ -52,11 +52,11 @@ static inline target_long lshift(target_long x, int n) } } -#define RC_MASK 0xc00 -#define RC_NEAR 0x000 -#define RC_DOWN 0x400 -#define RC_UP 0x800 -#define RC_CHOP 0xc00 +#define FPU_RC_MASK 0xc00 +#define FPU_RC_NEAR 0x000 +#define FPU_RC_DOWN 0x400 +#define FPU_RC_UP 0x800 +#define FPU_RC_CHOP 0xc00 #define MAXTAN 9223372036854775808.0 @@ -4024,18 +4024,18 @@ static void update_fp_status(void) int rnd_type; /* set rounding mode */ - switch(env->fpuc & RC_MASK) { + switch(env->fpuc & FPU_RC_MASK) { default: - case RC_NEAR: + case FPU_RC_NEAR: rnd_type = float_round_nearest_even; break; - case RC_DOWN: + case FPU_RC_DOWN: rnd_type = float_round_down; break; - case RC_UP: + case FPU_RC_UP: rnd_type = float_round_up; break; - case RC_CHOP: + case FPU_RC_CHOP: rnd_type = float_round_to_zero; break; } @@ -5629,6 +5629,50 @@ void helper_vmexit(uint32_t exit_code, uint64_t exit_info_1) /* MMX/SSE */ /* XXX: optimize by storing fptt and fptags in the static cpu state */ + +#define SSE_DAZ 0x0040 +#define SSE_RC_MASK 0x6000 +#define SSE_RC_NEAR 0x0000 +#define SSE_RC_DOWN 0x2000 +#define SSE_RC_UP 0x4000 +#define SSE_RC_CHOP 0x6000 +#define SSE_FZ 0x8000 + +static void update_sse_status(void) +{ + int rnd_type; + + /* set rounding mode */ + switch(env->mxcsr & SSE_RC_MASK) { + default: + case SSE_RC_NEAR: + rnd_type = float_round_nearest_even; + break; + case SSE_RC_DOWN: + rnd_type = float_round_down; + break; + case SSE_RC_UP: + rnd_type = float_round_up; + break; + case SSE_RC_CHOP: + rnd_type = float_round_to_zero; + break; + } + set_float_rounding_mode(rnd_type, &env->sse_status); + + /* set denormals are zero */ + set_flush_inputs_to_zero((env->mxcsr & SSE_DAZ) ? 1 : 0, &env->sse_status); + + /* set flush to zero */ + set_flush_to_zero((env->mxcsr & SSE_FZ) ? 1 : 0, &env->fp_status); +} + +void helper_ldmxcsr(uint32_t val) +{ + env->mxcsr = val; + update_sse_status(); +} + void helper_enter_mmx(void) { env->fpstt = 0; diff --git a/target-i386/translate.c b/target-i386/translate.c index 8321bf39a5..b9839c5d96 100644 --- a/target-i386/translate.c +++ b/target-i386/translate.c @@ -7544,7 +7544,7 @@ static target_ulong disas_insn(DisasContext *s, target_ulong pc_start) gen_lea_modrm(s, modrm, ®_addr, &offset_addr); if (op == 2) { gen_op_ld_T0_A0(OT_LONG + s->mem_index); - tcg_gen_st32_tl(cpu_T[0], cpu_env, offsetof(CPUX86State, mxcsr)); + gen_helper_ldmxcsr(cpu_T[0]); } else { tcg_gen_ld32u_tl(cpu_T[0], cpu_env, offsetof(CPUX86State, mxcsr)); gen_op_st_T0_A0(OT_LONG + s->mem_index); |