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Fix missing ExtendedControlRegister when CRYPTOPP_DISABLE_ASM 

Also see https://github.com/noloader/cryptopp-cmake/issues/44
pull/769/head
Jeffrey Walton 2018-12-28 12:19:13 -05:00
parent 16f9cbc82a
commit 29d1c1772d
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GPG Key ID: B36AB348921B1838
1 changed files with 11 additions and 2 deletions
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13
cpu.cpp
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@ -322,8 +322,13 @@ void DetectX86Features()
CRYPTOPP_CONSTANT(AVX_FLAG = (3 << 27))
if ((cpuid1[2] & AVX_FLAG) == AVX_FLAG)
{
// Unable to perform the necessary tests
#if defined(CRYPTOPP_DISABLE_ASM)
g_hasAVX = false;
// GCC 4.1/Binutils 2.17 cannot consume xgetbv
#if defined(__GNUC__) || (__SUNPRO_CC >= 0x5100) || defined(__BORLANDC__)
#elif defined(__GNUC__) || (__SUNPRO_CC >= 0x5100) || defined(__BORLANDC__)
// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71659 and
// http://www.agner.org/optimize/vectorclass/read.php?i=65
word32 a=0, d=0;
@ -360,8 +365,12 @@ void DetectX86Features()
#elif defined(_MSC_VER) && _MSC_VER <= 1500 && defined(_M_X64)
word64 xcr0 = ExtendedControlRegister(0);
g_hasAVX = (xcr0 & YMM_FLAG) == YMM_FLAG;
#elif defined(__SUNPRO_CC) // fall into
// Downlevel SunCC
#elif defined(__SUNPRO_CC)
g_hasAVX = false;
// _xgetbv is available
#else
word64 xcr0 = _xgetbv(0);
g_hasAVX = (xcr0 & YMM_FLAG) == YMM_FLAG;