https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87976
--- Comment #4 from Marc Glisse <glisse at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #1) > apinski@xeond:~/src/toolchain-o7$ gcc t6.c -mavx -O2 -S -o - -march=native > .file "t6.c" > .text > .p2align 4,,15 > .globl g > .type g, @function > g: > .LFB4758: > .cfi_startproc > vpbroadcastq %rdi, %ymm0 > jmp f@PLT > .cfi_endproc This requires AVX512. Regular -march=skylake still goes through the stack. So it seems at least a tiny bit different from bug 80820 where -march=haswell is enough to avoid going through memory.
