diff options
| author | Chris Robinson <[email protected]> | 2012-09-14 01:10:19 -0700 |
|---|---|---|
| committer | Chris Robinson <[email protected]> | 2012-09-14 01:10:19 -0700 |
| commit | ec74fb9ba2eaf0b75685f6c88cd96270408c1da6 (patch) | |
| tree | 79cc271c9eac1f1eb59db52133511f06976124e8 /Alc/helpers.c | |
| parent | ff809f2271099acf4527a23d55a034e1cef5e900 (diff) | |
Enable flush-to-zero mode when possible
Diffstat (limited to 'Alc/helpers.c')
| -rw-r--r-- | Alc/helpers.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/Alc/helpers.c b/Alc/helpers.c index 80d8e0e4..a6ed583f 100644 --- a/Alc/helpers.c +++ b/Alc/helpers.c @@ -166,6 +166,46 @@ void al_free(void *ptr) #endif } + +int SetMixerFPUMode(void) +{ +#if defined(_FPU_GETCW) && defined(_FPU_SETCW) && (defined(__i386__) || defined(__x86_64__)) + fpu_control_t fpuState, newState; + _FPU_GETCW(fpuState); + newState = fpuState&~(_FPU_EXTENDED|_FPU_DOUBLE|_FPU_SINGLE | + _FPU_RC_NEAREST|_FPU_RC_DOWN|_FPU_RC_UP|_FPU_RC_ZERO); + newState |= _FPU_SINGLE | _FPU_RC_ZERO; + if((CPUCapFlags&CPU_CAP_SSE)) + newState |= 0x8000; /* flush-to-zero */ + _FPU_SETCW(newState); +#else + int fpuState; +#if defined(HAVE__CONTROLFP) + fpuState = _controlfp(0, 0); + (void)_controlfp(_RC_CHOP|_DN_FLUSH|_PC_24, _MCW_RC|_MCW_DN|_MCW_PC); +#elif defined(HAVE_FESETROUND) + fpuState = fegetround(); +#ifdef FE_TOWARDZERO + fesetround(FE_TOWARDZERO); +#endif +#endif +#endif + return fpuState; +} + +void RestoreFPUMode(int state) +{ +#if defined(_FPU_GETCW) && defined(_FPU_SETCW) && (defined(__i386__) || defined(__x86_64__)) + fpu_control_t fpuState = state; + _FPU_SETCW(fpuState); +#elif defined(HAVE__CONTROLFP) + _controlfp(state, _MCW_RC|_MCW_DN|_MCW_PC); +#elif defined(HAVE_FESETROUND) + fesetround(state); +#endif +} + + #ifdef _WIN32 void pthread_once(pthread_once_t *once, void (*callback)(void)) { |