some sse2 intrinsics missing

Clang Frontend
#1

It seems that Clang doesn’t recognize all of the sse2 intrinsics:

./bssSIMD.h:39:9: error: use of undeclared identifier '__builtin_ia32_cmpgtpd'; did you mean '__builtin_ia32_pcmpgtd'?
        r.v_ = __builtin_ia32_cmpgtpd (x, xmax.v_);
               ^~~~~~~~~~~~~~~~~~~~~~
...
./bssSIMD.h:51:9: error: use of undeclared identifier '__builtin_ia32_cmpltpd'; did you mean '__builtin_ia32_pcmpgtd'?
        r.v_ = __builtin_ia32_cmpltpd (x, xmin.v_);
               ^~~~~~~~~~~~~~~~~~~~~~

However, it does not complain about __builtin_ia32_blendvpd, __builtin_ia32_maxpd, or __builtin_ia32_minpd.

I built Clang 3.3 from the SVN version about a month ago. I compile with these options:

-march=core2 -msse2 -m64 -std=c++0x -fPIC -pthread -gcc-toolchain /opt/gcc-4.7.1

I expected ‘-march=core2’ to be sufficient to enable the sse2 instructions, and then I added ‘-msse2’ just in case that was the problem. It didn’t help.

#2

This is a builtin, not an intrinsic. The intrinsic is _mm_cmpgt_pd.

  • Steve
#3

(To be more clear: don’t use builtins for SSE/AVX, they are both non-portable and fragile; include <immintrin.h> and use the intrinsics.)

#4

Hi Richard,

Here is some more information, along with a script to help upgrade your code:
http://clang.llvm.org/compatibility.html#vector_builtins

-Chris