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| author | Andreas Kling <andreas.kling@nokia.com> | 2010-07-26 10:07:16 (GMT) |
|---|---|---|
| committer | Andreas Kling <andreas.kling@nokia.com> | 2010-07-26 10:37:01 (GMT) |
| commit | efa190848270347362a1caab739961d185561627 (patch) | |
| tree | 0d683db967e87a8e23360699da1787e87ff916f0 /src/corelib/tools/qsimd.cpp | |
| parent | 5878a161e8a4b332fc056874aee4833352dedaa9 (diff) | |
| download | Qt-efa190848270347362a1caab739961d185561627.zip Qt-efa190848270347362a1caab739961d185561627.tar.gz Qt-efa190848270347362a1caab739961d185561627.tar.bz2 | |
Use the appropriate CPUID bitmap for detecting SSE3 etc
This information actually comes from ECX after CPUID(0x00000001),
not EDX after CPUID(0x80000001)
Diffstat (limited to 'src/corelib/tools/qsimd.cpp')
| -rw-r--r-- | src/corelib/tools/qsimd.cpp | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/src/corelib/tools/qsimd.cpp b/src/corelib/tools/qsimd.cpp index aa2ee47..ea90b66 100644 --- a/src/corelib/tools/qsimd.cpp +++ b/src/corelib/tools/qsimd.cpp @@ -91,6 +91,7 @@ uint qDetectCPUFeatures() features = MMX|SSE|SSE2; #elif defined(__i386__) || defined(_M_IX86) unsigned int extended_result = 0; + unsigned int feature_result = 0; uint result = 0; /* see p. 118 of amd64 instruction set manual Vol3 */ #if defined(Q_CC_GNU) @@ -112,7 +113,8 @@ uint qDetectCPUFeatures() "1:\n" "pop %%ebx\n" "mov %%edx, %0\n" - : "=r" (result) + "mov %%ecx, %1\n" + : "=r" (result), "=r" (feature_result) : : "%eax", "%ecx", "%edx" ); @@ -164,6 +166,7 @@ uint qDetectCPUFeatures() mov eax, 1 cpuid mov result, edx + mov feature_result, ecx skip: pop edx pop ecx @@ -218,15 +221,15 @@ uint qDetectCPUFeatures() features |= SSE; if (result & (1u << 26)) features |= SSE2; - if (extended_result & (1u)) + if (feature_result & (1u)) features |= SSE3; - if (extended_result & (1u << 9)) + if (feature_result & (1u << 9)) features |= SSSE3; - if (extended_result & (1u << 19)) + if (feature_result & (1u << 19)) features |= SSE4_1; - if (extended_result & (1u << 20)) + if (feature_result & (1u << 20)) features |= SSE4_2; - if (extended_result & (1u << 28)) + if (feature_result & (1u << 28)) features |= AVX; #endif // i386 |