[PATCH] D81632: Fix undefined behavior in PeepholeOptimizer.

[Matthias Braun via Phabricator via llvm-commits]

MatzeB added a comment.

In D81632#2092363 <https://reviews.llvm.org/D81632#2092363>, @linzj wrote:

>> I think SubIdx is supposed to be set by TII->isCoalescableExtInstr(). If it's not doing that, then the error's probably in that call and not in this function.
>
> Then most target instr infos need to patch.

`SubIdx` only needs to be set the function ends up doing `return true;`.


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  https://reviews.llvm.org/D81632/new/

https://reviews.llvm.org/D81632