https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85721
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Component|c++ |middle-end
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
At -O3, it is vectorized with an alias check at the beginning.
.L4:
movdqu xmm0, XMMWORD PTR [rsi+rax]
movups XMMWORD PTR [rdi+rax], xmm0
add rax, 16
cmp rax, rcx
jne .L4
That is a vectorized part of the loop
lea rax, [rsi+16]
cmp rdi, rax
lea rax, [rdi+16]
setnb cl
cmp rsi, rax
setnb al
or cl, al
je .L7
lea rax, [rdx-1]
cmp rax, 14
jbe .L7
That is an alias check, though it looks like it could be improved.
