[cfe-dev] gcc 4.2.1 xmmintrin.h vs clang's xxmintrin.h

Ted Kremenek kremenek at apple.com
Wed Feb 16 13:31:46 PST 2011

Hi Amit,

I think the information you are looking for is here:


The upshot is that the GCC builtins are not provided, and users should use the portable high-level operations that lower to the appropriate operations for the given compiler.

On Feb 16, 2011, at 1:25 PM, Amit Kulkarni wrote:

> Hi,
> I am compiling a program which uses '__builtin_ia32_cmpgtps' and
> '__builtin_ia32_cmpeqps'. I find that they are SSE extensions.
> Now the header file for OpenBSD's gcc 4.2.1 /usr/include/xmmintrin.h
> has a mention of those two instructions. But the header file for clang
> in
> /usr/local/lib/clang/2.9/include/xmmintrin.h doesn't have any mention
> of this? Compiling C++ programs is picking up clang's header vs gcc
> header.
> looking at http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20080929/007949.html,
> it used to be present in clang, now where is it disappeared to?
> Thanks
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