How to test if your Linux Support SSE2

Question

Actually I have 2 questions:

1. Is SSE2 Compatibility a CPU issue or Compiler issue?
2. How to check if your CPU or Compiler support SSE2?

I am u

Answer 1

Another trick not yet mentioned is do:

gcc -march=native -dM -E - 

and get:

#define __SSE2_MATH__ 1
#define __SSE2__ 1

With -march=native you are checking both your compiler and your CPU. If you give a different -march for a specific CPU, like -march=bonnell you can check for that CPU.

Consult your gcc docs for the correct version of gcc:

https://gcc.gnu.org/onlinedocs/gcc-4.9.0/gcc/Submodel-Options.html