Hello, is there a way to tell gcc to not emit the `vzeroupper` instruction while using -march=corei7avx? I do realize that this instruction is neccessary if legacy 128 bit SSE instructions are intermixed with AVX 128/256 bit code, like calling a libc function which makes use of SSE in a non-AVX glibc or the other way around. But in a pure AVX code environment I noticed it actually does hurt performance. So how can I tell gcc to not emit vzeroupper while generating AVX instructions? - Gunther
