https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109780
--- Comment #38 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Sam James from comment #29)
> $ gcc-14 p.c -o p -O2 -march=znver1 -fno-stack-protector
> -fno-stack-clash-protection && ./p
> Segmentation fault (core dumped)
Adding -mpreferred-stack-boundary=3 (as expected) "fixes" the testcase. The
difference of "g" is in the realignment AND insn:
vmovdqa %xmm1, %xmm0
.cfi_offset 3, -24
movl $1, %ebx
- leaq -48(%rsp), %rdx
+ andq $-16, %rsp
movl $9, %r11d
+ leaq -48(%rsp), %rdx
movq d(%rip), %rcx
jmp .L7
