[PATCH] D76983: [InstCombine] Transform extractelement-trunc -> bitcast-extractelement

[Daan Sprenkels via Phabricator via llvm-commits]

dsprenkels created this revision.
dsprenkels added reviewers: RKSimon, spatel.
Herald added subscribers: llvm-commits, hiraditya.
Herald added a project: LLVM.
dsprenkels added a comment.

It was a bit unclear to me how involved the tests should be for this patch. At this time, I kept them pretty minimal, but I could add more if that's desired.


Canonicalize the case when a scalar extracted from a vector is
truncated.  Transform such cases to bitcast-then-extractelement.
This will enable erasing the truncate operation.

This commit fixes PR45314.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D76983

Files:
  llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
  llvm/test/Transforms/InstCombine/pr45314_be.ll
  llvm/test/Transforms/InstCombine/pr45314_le.ll

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