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Interpreter: software-based flush-to-zero

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bDAZ is now called bFlushToZero to better reflect what it's actually
used for.

I decided not to support any hardware-based flush-to-zero on systems
that don't support this for both inputs _and_ outputs. It makes the code
cleaner and the intersection of CPUs that support SSE2 but not DAZ
should be very small.
This commit is contained in:
Tillmann Karras
2013-10-24 22:05:53 +02:00
parent 466a7afde3
commit cd069fdce1
5 changed files with 26 additions and 22 deletions
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8
Source/Core/Common/Src/x64CPUDetect.cpp
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@ -162,6 +162,7 @@ void CPUInfo::Detect()
if ((cpu_id[2] >> 20) & 1) bSSE4_2 = true;
if ((cpu_id[2] >> 25) & 1) bAES = true;
// To check DAZ support, we first need to check FXSAVE support.
if ((cpu_id[3] >> 24) & 1)
{
// We can use FXSAVE.
@ -181,7 +182,12 @@ void CPUInfo::Detect()
// lowest byte of MXCSR_MASK
if ((fx_state[0x1C] >> 6) & 1)
bDAZ = true;
{
// On x86, the FTZ field (supported since SSE1) only flushes denormal _outputs_ to zero,
// now that we checked DAZ support (flushing denormal _inputs_ to zero),
// we can set our generic flag.
bFlushToZero = true;
}
}
// AVX support requires 3 separate checks: