[PATCH][X86] Add Clang support for intrinsics __rdtsc and __rdtscp.

[Reid Kleckner]

LGTM


On Thu, Apr 24, 2014 at 11:20 AM, Andrea Di Biagio <
andrea.dibiagio at gmail.com> wrote:

> Hi,
>
> This patch:
> 1. adds a definition for two new Builtinsx86:
>   __builtin_ia32_rdtsc;
>   __builtin_ia32_rdtscp.
>
> 2. Replaces the already existing definition of intrinsics __rdtsc in
> ia32intrin.h with a simple call to the new GCC builtin
> '__builtin_ia32_rdtsc()'.
>
> 3. Adds a definition for the new intrinsic __rdtscp in ia32intrin.h.
>
> LLVM revision 207127 (
> http://llvm.org/viewvc/llvm-project?view=revision&revision=207127)
> added the two new x86 builtin intrinsics to the IR.
> This patch is simply adding the support for the two new intrinsics to
> Clang.
>
> Please let me know if ok to submit.
>
> Thanks,
> Andrea Di Biagio
> SN Systems - Sony Computer Entertainment Group.
>
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