[llvm-branch-commits] [llvm] release/22.x: MIPS: readsWritesFloatRegister, inc Idx for continue (#179932) (PR #180110)

[YunQiang Su via llvm-branch-commits]

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