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[JAEGER] Implement SSE4.2 check. r=sstangl.

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This commit is contained in:
Alex Miller 2010-08-12 22:05:57 -07:00
parent f243e896b6
commit 2b52da7be8
1 changed files with 17 additions and 3 deletions
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20
js/src/assembler/assembler/MacroAssemblerX86Common.h
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@ -1078,7 +1078,8 @@ public:
NotCheckedSSE = 0,
NoSSE = 1,
HasSSE2 = 2,
HasSSE4_1 = 3 // implies HasSSE2
HasSSE4_1 = 3, // implies HasSSE2
HasSSE4_2 = 4 // implies HasSSE4_1
};
static SSECheckState getSSEState()
@ -1131,7 +1132,10 @@ private:
#endif
static const int SSE2FeatureBit = 1 << 26;
static const int SSE41FeatureBit = 1 << 19;
if (flags_ecx & SSE41FeatureBit)
static const int SSE42FeatureBit = 1 << 20;
if (flags_ecx & SSE42FeatureBit)
s_sseCheckState = HasSSE4_2;
else if (flags_ecx & SSE41FeatureBit)
s_sseCheckState = HasSSE4_1;
else if (flags_edx & SSE2FeatureBit)
s_sseCheckState = HasSSE2;
@ -1182,9 +1186,19 @@ private:
// Only check once.
ASSERT(s_sseCheckState != NotCheckedSSE);
return s_sseCheckState == HasSSE4_1;
return s_sseCheckState >= HasSSE4_1;
}
static bool isSSE42Present()
{
if (s_sseCheckState == NotCheckedSSE) {
setSSECheckState();
}
// Only check once.
ASSERT(s_sseCheckState != NotCheckedSSE);
return s_sseCheckState >= HasSSE4_2;
}
};
} // namespace JSC