https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120734
Bug ID: 120734
Summary: -m32 -march=i686 doesn't use "mov $0, mem"
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
Target: i386
[hjl@gnu-tgl-3 gcc]$ cat /tmp/x.c
extern char *aligned_heap_area;
void
bar (void)
{
aligned_heap_area = 0;
}
[hjl@gnu-tgl-3 gcc]$ ./xgcc -B./ -S -m32 -march=i686 -O2 /tmp/x.c
[hjl@gnu-tgl-3 gcc]$ cat x.s
.file "x.c"
.text
.p2align 4
.globl bar
.type bar, @function
bar:
.LFB0:
.cfi_startproc
xorl %eax, %eax
movl %eax, aligned_heap_area
^^^^^^^ "movl $0, aligned_heap_area" should be used.
ret
.cfi_endproc
.LFE0:
.size bar, .-bar
.ident "GCC: (GNU) 16.0.0 20250620 (experimental)"
.section .note.GNU-stack,"",@progbits
[hjl@gnu-tgl-3 gcc]$
