wzssyqa wrote:

> @wzssyqa Can you please provide some more context on what this is fixing? Is 
> this fixing a miscompile? A crash? An optimization issue? The original PR 
> doesn't say.

Yes. you can see the testcase in this patch:

I find this problem when built builtins.
The problems is that:
I was plan to loop all of the Operands of an Instruction, while put
  `continue`
before
   Idx ++

Which made a mistake that consider something like
   `mfc1 $a1, $f1`
as a writer of `$f1`

https://github.com/llvm/llvm-project/pull/180110
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