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Testing for Visual Studio 2010 SP1 or greater before calling the _xgetbv intrinsic. This also fixes a minor code formatting issue.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178666 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Aaron Ballman 2013-04-03 16:28:24 +00:00
parent 375d767b54
commit 1ac8f9073c
1 changed files with 2 additions and 2 deletions
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4
lib/Support/Host.cpp
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@ -113,13 +113,13 @@ static bool GetX86CpuIDAndInfo(unsigned value, unsigned *rEAX,
}
static bool OSHasAVXSupport() {
#if defined( __GNUC__ )
#if defined(__GNUC__)
// Check xgetbv; this uses a .byte sequence instead of the instruction
// directly because older assemblers do not include support for xgetbv and
// there is no easy way to conditionally compile based on the assembler used.
int rEAX, rEDX;
__asm__ (".byte 0x0f, 0x01, 0xd0" : "=a" (rEAX), "=d" (rEDX) : "c" (0));
#elif defined(_MSC_VER)
#elif defined(_MSC_FULL_VER) && _MSC_FULL_VER >= 160040219
unsigned long long rEAX = _xgetbv(_XCR_XFEATURE_ENABLED_MASK);
#else
int rEAX = 0; // Ensures we return false