https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108141
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |crazylht at gmail dot com
Target| |i?86-*-*
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
it looks better overall but the key difference is:
- movzwl 8(%ebp), %edi
+ movzwl 8(%ebp), %eax
+ movw %ax, 30(%esp)
...
- vmovd %edi, %xmm1
+ vpbroadcastw 30(%esp), %xmm2
+ vpbroadcastw 30(%esp), %ymm0
...
- vmovd %edi, %xmm0
...
- vpbroadcastw %xmm1, %xmm1
- vpbroadcastw %xmm0, %ymm0
I wonder whether optimal would be
vpbroadcasstw 8(%ebp), %xmm2
vpbroadcasstw 8(%ebp), %ymm0
though.
