[LLVMdev] [PATCH] CPUID for Win64
clattner at apple.com
Sat Apr 25 11:27:52 PDT 2009
On Apr 24, 2009, at 4:16 AM, Nicolas Capens wrote:
> Hi all,
> Please consider applying the attached patch. Currently on Windows
> x86-64 the processor features are not detected because the inline
> assembly (which Visual C++ deprecated for x64) does not have an
> alternative that uses intrinsics. Later tests for x86-64 then only
> enable SSE2, leaving any more recent instruction set unused.
> The patch uses the __cpuid intrinsic that compile under 32-bit as
> well as 64-bit. I’ve only tested it with my own experimental project
> on Windows x64 but I see no potential issues for other platforms. A
> potential additional improvement would be to cause a compiler error
> when the GetCpuIDAndInfo does not compile to the intended code, and
> to remove the test that follows right
> afterAutoDetectSubtargetFeatures() has been called.
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