https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104704
--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> ---
--- pieces-memset-46.s 2022-03-02 06:44:55.845212762 -0800
+++
/export/build/gnu/tools-build/gcc-gitlab-debug/build-x86_64-linux/gcc/pieces-memset-46.s
2022-03-02 06:45:03.313188978 -0800
@@ -8,9 +8,11 @@ foo:
.cfi_startproc
movq dst(%rip), %rdx
movl $3, %eax
- vpbroadcastb %eax, %zmm31
- vmovdqu8 %zmm31, (%rdx)
- vmovw %xmm31, 64(%rdx)
+ vpbroadcastb %eax, %zmm0
+ movl $771, %eax
+ movw %ax, 64(%rdx)
+ vmovdqu8 %zmm0, (%rdx)
+ vzeroupper
ret
.cfi_endproc
.LFE0:
gen_reg_rtx generates 2 extra instructions for pieces-memset-46.c.
