[PATCH] D101191: [InstCombine] Fully disable select to and/or i1 folding

Tue May 25 10:33:16 PDT 2021

spatel added a comment.

In D101191#2779631 <https://reviews.llvm.org/D101191#2779631>, @spatel wrote:

> In D101191#2779007 <https://reviews.llvm.org/D101191#2779007>, @fhahn wrote:
>
>> Looks like this is causing an infinite loop in instcombine: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=34661
>
> This seems likely to be another partial undef/poison vector problem ( 1894c6c59e <https://reviews.llvm.org/rG1894c6c59e37b47c284f2a5ebb92b73911e71e38> ). I'll take a look.

The fuzzer test can be reduced to a single line. I committed a minimal fix here:
ae1bc9ebf3 <https://reviews.llvm.org/rGae1bc9ebf3a07d2b8c93624518f649805deccc3e>
...but some follow-up seems necessary.

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D101191/new/

https://reviews.llvm.org/D101191