Attached is a patch to fix the incorrect CPU feature detection:
On 2.1.2017 16.39, Janne Hyvärinen wrote:
Something seems to be wrong with cpu.c CPU detection code. When I
compile things with MSVC all instructions except FMA is detected as
missing, even though they are present in my CPU. That of course
results in awful performance.
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diff --git a/src/libFLAC/cpu.c b/src/libFLAC/cpu.c
index b9df19a..808d55d 100644
--- a/src/libFLAC/cpu.c
+++ b/src/libFLAC/cpu.c
@@ -269,9 +269,9 @@ void FLAC__cpu_info_x86(FLAC__uint32 level, FLAC__uint32
*eax, FLAC__uint32 *ebx
__cpuid(cpuinfo, ext);
if((unsigned)cpuinfo[0] >= level) {
#if FLAC__AVX_SUPPORTED
- __cpuidex(cpuinfo, ext, 0); /* for AVX2 detection */
+ __cpuidex(cpuinfo, level, 0); /* for AVX2 detection */
#else
- __cpuid(cpuinfo, ext); /* some old compilers don't support
__cpuidex */
+ __cpuid(cpuinfo, level); /* some old compilers don't support
__cpuidex */
#endif
*eax = cpuinfo[0]; *ebx = cpuinfo[1]; *ecx = cpuinfo[2]; *edx =
cpuinfo[3];
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