How to specify the CFLAGS to gcc-4.6 or gcc-4.7 to use the Intel-AVX

Question

I have an Intel Core i7-3770, and I found that it contains the AVX, How do I specify the CFLAGS to gcc-4.6 or gcc-4.7 to use the Intel-AVX? Is there some example code or manual about this? Thanks.

Answer 1

You should use -mavx switch or select proper CPU using -march=flag with flag equal corei7-avx, core-avx-i or core-avx2.

Still the compiler may not generate vectorized code unless you add some other switches.