https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105780
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- It was vectorized: movd xmm1, edx shr rsi, 2 pshufd xmm0, xmm1, 0 sal rsi, 4 add rsi, rcx .L4: movups XMMWORD PTR [rax], xmm0 add rax, 16 cmp rsi, rax jne .L4 And has been since GCC 6.