Header files for x86 SIMD intrinsics

Question

Which header files provide the intrinsics for the different x86 SIMD instruction set extensions (MMX, SSE, AVX, ...)? It seems impossible to find such a list online. Correct

Answer 1

On GCC/clang, if you use just

#include 

it will include all SSE/AVX headers which are enabled according to compiler switches like -march=haswell or just -march=native. Additionally some x86 specific instructions like bswap or ror become available as intrinsics.

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The MSVC equivalent of this header

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If you just want portable SIMD, use #include

MSVC, ICC, and gcc/clang (and other compilers like Sun I think) all support this header for the SIMD intrinsics documented by Intel's only intrinsics finder / search tool: https://software.intel.com/sites/landingpage/IntrinsicsGuide/