| Issue |
176103
|
| Summary |
[MCA] Bad formatting for some instructions
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
foxtran
|
Considering the following code:
```C
int asmC1() {
asm (
"stp x29, x0, [sp, #-16]!\n"
"ldp x29, x0, [sp], #16\n"
);
return 0;
}
```
for which the Assembly on AArch64 looks like:
```asm
asmC1():
stp x29, x0, [sp, #-16]!
ldp x29, x0, [sp], #16
mov w0, wzr
ret
```
Running of `llvm-mca` with arguments `-timeline -mcpu=cortex-a55` gives a bit strange output with extra dots for `stp` instruction:
```
[0,0] D . . . . . . . . . . stp x29, x0, [sp, #-16]!
[0,1] DeeeeE . . . . . . . . . ldp x29, x0, [sp], #16
[0,2] . DeeE . . . . . . . . . mov w0, wzr
[0,3] . DE . . . . . . . . . ret
[1,0] . DE . . . . . . . . . . stp x29, x0, [sp, #-16]!
[1,1] . DeeeeE . . . . . . . . ldp x29, x0, [sp], #16
[1,2] . . DeeE . . . . . . . . mov w0, wzr
[1,3] . . DE . . . . . . . . ret
[2,0] . . DE . . . . . . . . . . stp x29, x0, [sp, #-16]!
[2,1] . . DeeeeE . . . . . . . ldp x29, x0, [sp], #16
[2,2] . . . DeeE . . . . . . . mov w0, wzr
[2,3] . . . DE . . . . . . . ret
[3,0] . . . DE . . . . . . . . . . stp x29, x0, [sp, #-16]!
[3,1] . . . DeeeeE . . . . . . ldp x29, x0, [sp], #16
[3,2] . . . . DeeE . . . . . . mov w0, wzr
[3,3] . . . . DE . . . . . . ret
[4,0] . . . . DE . . . . . . . . . . stp x29, x0, [sp, #-16]!
[4,1] . . . . DeeeeE . . . . . ldp x29, x0, [sp], #16
[4,2] . . . . . DeeE . . . . . mov w0, wzr
[4,3] . . . . . DE . . . . . ret
[5,0] . . . . . DE . . . . . . . . . . stp x29, x0, [sp, #-16]!
[5,1] . . . . . DeeeeE . . . . ldp x29, x0, [sp], #16
[5,2] . . . . . . DeeE . . . . mov w0, wzr
[5,3] . . . . . . DE . . . . ret
[6,0] . . . . . . DE . . . . . . . . . . stp x29, x0, [sp, #-16]!
[6,1] . . . . . . DeeeeE . . . ldp x29, x0, [sp], #16
[6,2] . . . . . . . DeeE . . . mov w0, wzr
[6,3] . . . . . . . DE . . . ret
[7,0] . . . . . . . DE . . . . . . . . . . stp x29, x0, [sp, #-16]!
[7,1] . . . . . . . DeeeeE . . ldp x29, x0, [sp], #16
[7,2] . . . . . . . . DeeE . . mov w0, wzr
[7,3] . . . . . . . . DE . . ret
[8,0] . . . . . . . . DE . . . . . . . . . . stp x29, x0, [sp, #-16]!
[8,1] . . . . . . . . DeeeeE . ldp x29, x0, [sp], #16
[8,2] . . . . . . . . . DeeE . mov w0, wzr
[8,3] . . . . . . . . . DE . ret
[9,0] . . . . . . . . . DE . . . . . . . . . . stp x29, x0, [sp, #-16]!
[9,1] . . . . . . . . . DeeeeE ldp x29, x0, [sp], #16
[9,2] . . . . . . . . . . DeeE mov w0, wzr
[9,3] . . . . . . . . . . DE ret
```
Example on godbolt: https://godbolt.org/z/46erYsj7r
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