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cpu: fix AVX2 detection for gcc/clang targets

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ecx needs to be set to 0; the visual studio builds were already doing
this.

https://software.intel.com/en-us/articles/how-to-detect-new-instruction-support-in-the-4th-generation-intel-core-processor-family

Change-Id: I95efb115b4d50bbdb6b14fca2aa63d0a24974e55
This commit is contained in:
James Zern 2015-01-12 17:58:57 -08:00
parent d581ba40ba
commit d7c4b02a57
1 changed files with 2 additions and 2 deletions
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4
src/dsp/cpu.c
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@ -29,14 +29,14 @@ static WEBP_INLINE void GetCPUInfo(int cpu_info[4], int info_type) {
"cpuid\n"
"xchg %%edi, %%ebx\n"
: "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
: "a"(info_type));
: "a"(info_type), "c"(0));
}
#elif defined(__i386__) || defined(__x86_64__)
static WEBP_INLINE void GetCPUInfo(int cpu_info[4], int info_type) {
__asm__ volatile (
"cpuid\n"
: "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
: "a"(info_type));
: "a"(info_type), "c"(0));
}
#elif defined(_MSC_FULL_VER) && _MSC_FULL_VER >= 150030729 // >= VS2008 SP1
#define GetCPUInfo(info, type) __cpuidex(info, type, 0) // set ecx=0