https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88483
Bug ID: 88483
Summary: Unnecessary stack alignment
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
CC: ubizjak at gmail dot com
Target Milestone: ---
Target: x86
[hjl@gnu-cfl-1 tmp]$ cat x.i
struct B
{
char a[12];
int b;
};
struct B
f2 (void)
{
struct B x = {};
return x;
}
[hjl@gnu-cfl-1 tmp]$ gcc -S -mavx2 -O2 x.i
[hjl@gnu-cfl-1 tmp]$ cat x.s
.file "x.i"
.text
.p2align 4,,15
.globl f2
.type f2, @function
f2:
.LFB0:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
xorl %eax, %eax
xorl %edx, %edx
movq %rsp, %rbp
.cfi_def_cfa_register 6
andq $-32, %rsp
leave
.cfi_def_cfa 7, 8
ret
.cfi_endproc
There is no need to realign stack.
