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Properly handle the SSE control word

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This commit is contained in:
Chris Robinson 2012-09-16 03:19:53 -07:00
parent a1daec66e2
commit df2e82da78
2 changed files with 40 additions and 16 deletions
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53
Alc/helpers.c
View File

@ -175,23 +175,36 @@ void al_free(void *ptr)
void SetMixerFPUMode(FPUCtl *ctl)
{
#if defined(_FPU_GETCW) && defined(_FPU_SETCW) && (defined(__i386__) || defined(__x86_64__))
fpu_control_t fpuState, newState;
_FPU_GETCW(fpuState);
#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
unsigned short fpuState;
__asm__ __volatile__("fnstcw %0" : "=m" (*&fpuState));
ctl->state = 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;
fpuState &= ~0x300; /* clear precision to single */
fpuState |= 0xC00; /* set round-to-zero */
__asm__ __volatile__("fldcw %0" : : "m" (*&fpuState));
#ifdef HAVE_SSE
if((CPUCapFlags&CPU_CAP_SSE))
newState |= 0x8000; /* flush-to-zero */
_FPU_SETCW(newState);
{
int sseState;
__asm__ __volatile__("stmxcsr %0" : "=m" (*&sseState));
ctl->sse_state = sseState;
sseState &= ~0x300; /* clear precision to single */
sseState |= 0xC00; /* set round-to-zero */
sseState |= 0x8000; /* set flush-to-zero */
__asm__ __volatile__("ldmxcsr %0" : : "m" (*&sseState));
}
#endif
#elif defined(HAVE___CONTROL87_2)
int mode;
__control87_2(0, 0, &ctl->state, NULL);
__control87_2(_RC_CHOP|_DN_FLUSH|_PC_24, _MCW_RC|_MCW_DN|_MCW_PC, &mode, NULL);
__control87_2(0, 0, &ctl->state, &ctl->sse_state);
__control87_2(_RC_CHOP|_PC_24, _MCW_RC|_MCW_PC, &mode, NULL);
#ifdef HAVE_SSE
if((CPUCapFlags&CPU_CAP_SSE))
__control87_2(_RC_CHOP|_PC_24|_DN_FLUSH, _MCW_RC|_MCW_PC|_MCW_DN, NULL, &mode);
#endif
#elif defined(HAVE__CONTROLFP)
ctl->state = _controlfp(0, 0);
(void)_controlfp(_RC_CHOP|_DN_FLUSH|_PC_24, _MCW_RC|_MCW_DN|_MCW_PC);
(void)_controlfp(_RC_CHOP|_PC_24, _MCW_RC|_MCW_PC);
#elif defined(HAVE_FESETROUND)
ctl->state = fegetround();
#ifdef FE_TOWARDZERO
@ -202,14 +215,22 @@ void SetMixerFPUMode(FPUCtl *ctl)
void RestoreFPUMode(const FPUCtl *ctl)
{
#if defined(_FPU_GETCW) && defined(_FPU_SETCW) && (defined(__i386__) || defined(__x86_64__))
fpu_control_t fpuState = ctl->state;
_FPU_SETCW(fpuState);
#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
unsigned short fpuState = ctl->state;
__asm__ __volatile__("fldcw %0" : : "m" (*&fpuState));
#ifdef HAVE_SSE
if((CPUCapFlags&CPU_CAP_SSE))
__asm__ __volatile__("ldmxcsr %0" : : "m" (*&ctl->sse_state));
#endif
#elif defined(HAVE___CONTROL87_2)
int mode;
__control87_2(ctl->state, _MCW_RC|_MCW_DN|_MCW_PC, &mode, NULL);
__control87_2(ctl->state, _MCW_RC|_MCW_PC, &mode, NULL);
#ifdef HAVE_SSE
if((CPUCapFlags&CPU_CAP_SSE))
__control87_2(ctl->sse_state, _MCW_DN, NULL, &mode);
#endif
#elif defined(HAVE__CONTROLFP)
_controlfp(ctl->state, _MCW_RC|_MCW_DN|_MCW_PC);
_controlfp(ctl->state, _MCW_RC|_MCW_PC);
#elif defined(HAVE_FESETROUND)
fesetround(ctl->state);
#endif

3
OpenAL32/Include/alMain.h
View File

@ -780,6 +780,9 @@ void al_free(void *ptr);
typedef struct {
int state;
#ifdef HAVE_SSE
int sse_state;
#endif
} FPUCtl;
void SetMixerFPUMode(FPUCtl *ctl);
void RestoreFPUMode(const FPUCtl *ctl);