Didn't require that much coaxing. -O3 --fast-math, i7-avx architecture. What did you do to break it?! xor eax, eax .L2: vmovdqu xmm1, X

Didn't require that much coaxing. -O3 --fast-math, i7-avx architecture. What did you do to break it?! xor eax, eax .L2: vmovdqu xmm1, XMMWORD PTR [rdx+rax] vinsertf128 ymm1, ymm1, XMMWORD PTR [rdx+16+rax], 0x1 vmovdqu xmm0, XMMWORD PTR [rsi+rax] vinsertf128 ymm0, ymm0, XMMWORD PTR [rsi+16+rax], 0x1 vorps ymm0, ymm0, ymm1 vmovdqu XMMWORD PTR [rdi+rax], xmm0 vextractf128 XMMWORD PTR [rdi+16+rax], ymm0, 0x1 add rax, 32 cmp rax, 4096 jne .L2 vzeroupper ret