https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87716
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-10-24
Target Milestone|--- |9.0
Ever confirmed|0 |1
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
We currently generate:
test1:
movdqa (%rdi), %xmm2
pavgb (%rsi), %xmm2
movdqa %xmm0, %xmm3
movdqa %xmm2, %xmm0
punpckhbw %xmm1, %xmm2
punpcklbw %xmm1, %xmm0
pmulhuw %xmm3, %xmm2
pmulhuw %xmm3, %xmm0
packuswb %xmm2, %xmm0
movaps %xmm0, (%rdx)
ret
One of
movdqa %xmm0, %xmm3
movdqa %xmm2, %xmm0
is redundant. We should generate
movdqa %xmm2, %xmm3
