[PATCH] D138526: [SimpleLoopUnswitch] unswitch selects

Mon May 1 10:30:33 PDT 2023

caojoshua added a comment.

In D138526#4309373 <https://reviews.llvm.org/D138526#4309373>, @vitalybuka wrote:

> In D138526#4309363 <https://reviews.llvm.org/D138526#4309363>, @caojoshua wrote:
>
>> Should be fixed by https://reviews.llvm.org/D149560, which does not unswitch vector selects.
>
> Could this be caused by this patch?
> https://lab.llvm.org/buildbot/#/builders/74/builds/18906

It first started failing in https://lab.llvm.org/buildbot/#/builders/237/builds/2419, which this patch is on the blamelist for. There are 11 patches on the blamelist, and this patch is the most disruptive. Looking at the error message, msan has found use-of-initialized error. Its not obvious to me how this patch can cause this.

I will try reproducing this locally.

Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D138526/new/

https://reviews.llvm.org/D138526