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Fix denormal control with VC6.

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This commit is contained in:
David Reid
2021-08-08 08:36:45 +10:00
parent d0285d6b51
commit 510519fe1d
1 changed files with 56 additions and 20 deletions
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miniaudio.h
+56 -20
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@@ -9663,32 +9663,68 @@ static MA_INLINE unsigned int ma_disable_denormals()
{
unsigned int prevState;
#if defined(MA_X86) || defined(MA_X64)
prevState = _mm_getcsr();
_mm_setcsr(prevState | _MM_DENORMALS_ZERO_MASK | _MM_FLUSH_ZERO_MASK);
#elif defined(_MSC_VER)
unsigned int unused;
_controlfp_s(&prevState, 0, 0);
_controlfp_s(&unused, prevState | _DN_FLUSH, _MCW_DN);
#else
/* Unknown or unsupported architecture. No-op. */
prevState = 0;
#endif
#if defined(_MSC_VER)
{
/*
Older versions of Visual Studio don't support the "safe" versions of _controlfp_s(). I don't
know which version of Visual Studio first added support for _controlfp_s(), but I do know
that VC6 lacks support. _MSC_VER = 1200 is VC6, but if you get compilation errors on older
versions of Visual Studio, let me know and I'll make the necessary adjustment.
*/
#if _MSC_VER <= 1200
{
prevState = _statusfp();
_controlfp(prevState | _DN_FLUSH, _MCW_DN);
}
#else
{
unsigned int unused;
_controlfp_s(&prevState, 0, 0);
_controlfp_s(&unused, prevState | _DN_FLUSH, _MCW_DN);
}
#endif
}
#elif defined(MA_X86) || defined(MA_X64)
{
prevState = _mm_getcsr();
_mm_setcsr(prevState | _MM_DENORMALS_ZERO_MASK | _MM_FLUSH_ZERO_MASK);
}
#else
{
/* Unknown or unsupported architecture. No-op. */
prevState = 0;
}
#endif
return prevState;
}
static MA_INLINE void ma_restore_denormals(unsigned int prevState)
{
#if defined(MA_X86) || defined(MA_X64)
_mm_setcsr(prevState);
#elif defined(_MSC_VER)
unsigned int unused;
_controlfp_s(&unused, prevState, _MCW_DN);
#else
/* Unknown or unsupported architecture. No-op. */
(void)prevState;
#endif
#if defined(_MSC_VER)
{
/* Older versions of Visual Studio do not support _controlfp_s(). See ma_disable_denormals(). */
#if _MSC_VER <= 1200
{
_controlfp(prevState, _MCW_DN);
}
#else
{
unsigned int unused;
_controlfp_s(&unused, prevState, _MCW_DN);
}
#endif
}
#elif defined(MA_X86) || defined(MA_X64)
{
_mm_setcsr(prevState);
}
#else
{
/* Unknown or unsupported architecture. No-op. */
(void)prevState;
}
#endif
}