[PATCH] D148509: [BranchFolder] Skip redundant IMPLICIT_DEFs of subregs

[Jay Foad via Phabricator via llvm-commits]

foad added a comment.

This is an alternative to D148438 <https://reviews.llvm.org/D148438>. It is based on a new test `test/CodeGen/AMDGPU/resource-usage-agpr-hi16.ll` that I have not committed yet.

The motivation is to avoid introducing mentions of registers like $agpr0_hi16 that were never mentioned in the original program.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D148509/new/

https://reviews.llvm.org/D148509