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For code logic clarity, add check for xgetbv support in CPU before using it.

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This commit is contained in:
Mounir IDRASSI
2017-07-01 00:58:55 +02:00
parent 33bb507fde
commit f5e6136830
1 changed files with 1 additions and 1 deletions
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src/Crypto/cpu.c
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@@ -305,7 +305,7 @@ void DetectX86Features()
g_hasMMX = (cpuid1[3] & (1 << 23)) != 0;
if ((cpuid1[3] & (1 << 26)) != 0)
g_hasSSE2 = TrySSE2();
if (g_hasSSE2 && (cpuid1[2] & (1 << 28)) && (cpuid1[2] & (1 << 27))) /* CPU has AVX and OS supports XSAVE/XRSTORE */
if (g_hasSSE2 && (cpuid1[2] & (1 << 28)) && (cpuid1[2] & (1 << 27)) && (cpuid1[2] & (1 << 26))) /* CPU has AVX and OS supports XSAVE/XRSTORE */
{
uint64 xcrFeatureMask = xgetbv();
g_hasAVX = (xcrFeatureMask & 0x6) == 0x6;