| Issue |
135487
|
| Summary |
[aarch64][x86] llvm keep .rodata..L__const section
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
guoxin049
|
https://godbolt.org/z/oTqx9jKzb
Option is: `-O2 -g0 -mgeneral-regs-only -fdata-sections -ffunction-sections`
```
void test(void)
{
char tmp_str2[20]="te0000";
__asm__ volatile ("":"+m"(tmp_str2)::);
}
```
AArch64 ASM:
```
test:
sub sp, sp, #0x20
mov x8, #0x6574 // #25972
str wzr, [sp, #24]
add x9, sp, #0x8
movk x8, #0x3030, lsl #16
movk x8, #0x3030, lsl #32
stp x8, xzr, [sp, #8]
add sp, sp, #0x20
ret
```
x86 ASM:
```
test:
movabs rax,0x303030306574
mov QWORD PTR [rsp-0x18],rax
mov DWORD PTR [rsp-0x8],0x0
mov QWORD PTR [rsp-0x10],0x0
ret
```
Segment info:
```
***
[ 4] .rodata..L__const.test.tmp_str2 PROGBITS
***
```
AArch64 uses mov and movk for loading constants, whereas x86 generates movabs for the same purpose. Is the .rodata..L__const.test.tmp_str2 segment required, or can it be removed?
Similar issues：https://github.com/llvm/llvm-project/issues/133684
![]()
_______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
