heiher 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"`.
Good idea!
https://github.com/llvm/llvm-project/pull/141037
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