xry111 wrote:
I have a C test case:
```c
unsigned long
test (unsigned long x, unsigned long y)
{
register unsigned long ra asm ("ra");
asm("" : "+r"(ra));
unsigned long t = ra;
asm ("csrxchg %0, %1, 0" : "+r" (x) : "r" (t));
return x;
}
```
clang-20.1.4 errors out:
```
t.c:8:8: error: must not be $r0 or $r1
8 | asm ("csrxchg %0, %1, 0" : "+r" (x) : "r" (t));
| ^
<inline asm>:1:16: note: instantiated into assembly here
1 | csrxchg $a0, $ra, 0
| ^
1 error generated.
```
And I suppose it should work after this PR and changing the second `"r"` to
`"q"`.
https://github.com/llvm/llvm-project/pull/141037
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