https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126980
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|-march=znver[456] doesn't |-Os may not generate the
|honor -Os |shortest code sequences
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
It isn't limited to -march=znver4:
[hjl@gnu-zen4-1 pr126980]$ cat y.c
int
func (int i)
{
int a[] =
{ 0, 1, 2, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12, 13, 14, 15 };
return a[i];
}
[hjl@gnu-zen4-1 pr126980]$ make CC=gcc y.s
gcc -Os -march=x86-64-v4 -S y.c
[hjl@gnu-zen4-1 pr126980]$ cat y.s
.file "y.c"
.text
.globl func
.type func, @function
func:
.LFB0:
.cfi_startproc
movl $1, %eax
movslq %edi, %rdi
salq $32, %rax
movq %rax, -64(%rsp)
movabsq $12884901890, %rax
movq %rax, -56(%rsp)
movabsq $21474836484, %rax
movq %rax, -48(%rsp)
movabsq $30064771078, %rax
movq %rax, -40(%rsp)
movabsq $38654705672, %rax
movq %rax, -32(%rsp)
movabsq $47244640266, %rax
movq %rax, -24(%rsp)
movabsq $55834574860, %rax
movq %rax, -16(%rsp)
movabsq $64424509454, %rax
movq %rax, -8(%rsp)
movl -64(%rsp,%rdi,4), %eax
ret
.cfi_endproc
.LFE0:
.size func, .-func
.ident "GCC: (GNU) 16.2.1 20260819 (Red Hat 16.2.1-2)"
.section .note.GNU-stack,"",@progbits
[hjl@gnu-zen4-1 pr126980]$
