Fix missing ExtendedControlRegister when CRYPTOPP_DISABLE_ASM

Also see https://github.com/noloader/cryptopp-cmake/issues/44

1 files changed, 11 insertions, 2 deletions

diff --git a/cpu.cpp b/cpu.cpp
index 6fa3fef3..7214bf98 100644
--- a/cpu.cpp
+++ b/cpu.cpp
@@ -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;