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Simplify AVX availabity detection, add support for Visual Studio

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This commit is contained in:
Frank Denis 2015-12-15 10:41:43 +01:00
parent 2ee3db59e7
commit 5f4763ce74
1 changed files with 12 additions and 7 deletions
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19
src/libsodium/sodium/runtime.c
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@ -140,18 +140,23 @@ _sodium_runtime_intel_cpu_features(CPUFeatures * const cpu_features)
cpu_features->has_avx = 0;
#if defined(HAVE_AVXINTRIN_H) || \
(defined(_MSC_VER) && (defined(_M_X64) || defined(_M_AMD64) || defined(_M_IX86)))
# ifdef HAVE_AVX_ASM
if ((cpu_info[2] & (CPUIDECX_AVX | CPUIDECX_XSAVE | CPUIDECX_OSXSAVE))
== (CPUIDECX_AVX | CPUIDECX_XSAVE | CPUIDECX_OSXSAVE)) {
uint32_t eax, edx;
uint32_t xcr0 = 0U;
# ifdef MSC_VER
__asm {
xor ecx, ecx
_asm _emit 0x0f _asm _emit 0x01 _asm _emit 0xd0
mov xcr0, eax
}
# elif defined(HAVE_AVX_ASM)
__asm__ __volatile__ (".byte 0x0f, 0x01, 0xd0" /* XGETBV */
: "=a"(eax), "=d"(edx)
: "c"((uint32_t) 0U));
if ((eax & (XCR0_SSE | XCR0_AVX)) == (XCR0_SSE | XCR0_AVX)) {
cpu_features->has_avx = ((cpu_info[2] & CPUIDECX_AVX) != 0x0);
: "=a"(xcr0) : "c"((uint32_t) 0U) : "%edx");
# endif
if ((xcr0 & (XCR0_SSE | XCR0_AVX)) == (XCR0_SSE | XCR0_AVX)) {
cpu_features->has_avx = 1;
}
}
# endif
#endif
#if defined(HAVE_WMMINTRIN_H) || \