diff options
Diffstat (limited to 'target-i386/op_helper.c')
| -rw-r--r-- | target-i386/op_helper.c | 64 |
1 files changed, 54 insertions, 10 deletions
diff --git a/target-i386/op_helper.c b/target-i386/op_helper.c index c89e4a4..2aea71b 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; |