https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51492
--- Comment #23 from Uroš Bizjak <ubizjak at gmail dot com> ---
Current compiler produces (-O3):
f:
movl $4194368, %edx
movl $head, %eax
movd %edx, %xmm1
pshufd $0, %xmm1, %xmm1
.L2:
movdqa (%rax), %xmm0
addq $16, %rax
psubusw %xmm1, %xmm0
movaps %xmm0, -16(%rax)
cmpq $head+131072, %rax
jne .L2
ret
