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Use _xgetbv() on Visual Studio, when available

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Frank Denis
2017-02-27 16:54:20 +01:00
parent 4fea4d917b
commit 03f27b4204
1 changed files with 3 additions and 1 deletions
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src/libsodium/sodium/runtime.c
+3 -1
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@@ -149,7 +149,9 @@ _sodium_runtime_intel_cpu_features(CPUFeatures * const cpu_features)
if ((cpu_info[2] & (CPUID_ECX_AVX | CPUID_ECX_XSAVE | CPUID_ECX_OSXSAVE)) ==
(CPUID_ECX_AVX | CPUID_ECX_XSAVE | CPUID_ECX_OSXSAVE)) {
uint32_t xcr0 = 0U;
# if defined(_MSC_VER) && defined(_M_IX86)
# if defined(_MSC_VER) && defined(_XCR_XFEATURE_ENABLED_MASK) && _MSC_FULL_VER >= 160040219
xcr0 = (uint32_t) _xgetbv(0);
# elif defined(_MSC_VER) && defined(_M_IX86)
__asm {
xor ecx, ecx
_asm _emit 0x0f _asm _emit 0x01 _asm _emit 0xd0