[PATCH] D126184: [InstCombine] bitcast(logic(bitcast(X), bitcast(Y))) --> bitcast'(logic(bitcast'(X), Y))

[Chenbing.Zheng via Phabricator via llvm-commits]

Chenbing.Zheng created this revision.
Chenbing.Zheng added reviewers: spatel, RKSimon, benshi001.
Chenbing.Zheng added a project: LLVM.
Herald added a subscriber: hiraditya.
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Herald added subscribers: llvm-commits, jacquesguan.

Before this patch foldBitCastBitwiseLogic limite the destination
must have an integer element type.

But we can still eliminate one bitcast by doing the logic op 
in the type of the input that has an integer element type.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D126184

Files:
  llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
  llvm/test/Transforms/InstCombine/bitcast-inseltpoison.ll
  llvm/test/Transforms/InstCombine/bitcast.ll

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