[PATCH] D87502: [DAGCombiner] Use known bits to fold extract_vector_elt with const index

[Jay Foad via Phabricator via llvm-commits]

foad added a comment.

This isn't ready to commit yet:

1. there are a few code quality regressions in the test cases
2. it provokes a crash on `test/CodeGen/AMDGPU/global-extload-i16.ll` which I haven't been able to fix yet


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D87502/new/

https://reviews.llvm.org/D87502