| Issue |
110251
|
| Summary |
asm goto wrong output at `-O0`
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
fuhsnn
|
Godbolt: https://godbolt.org/z/3a1vYMaoq
```
void asm_goto_output(int *arg) {
asm goto (
" subl $11, %[value];"
" cmpl $11, %[value]; je %l[label];"
: [value]"+r"(*arg)
:
: "cc"
: label
);
label:
return;
}
int main(void) {
int i = 22;
asm_goto_output(&i);
return i;
}
```
The output should be `11`, yet clang at `-O0` stores `0` to the pointed-to variable.
Looks like only the jump branch is buggy, if input is changed to another value and the fall-through path is taken, the output is correct.
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