[PATCH] D127392: [InstCombine] Combine consecutive loads which are being merged to form a wider load.

[Biplob Mishra via Phabricator via llvm-commits]

bipmis created this revision.
bipmis added reviewers: dmgreen, spatel, RKSimon.
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The patch simplifies some of the patterns as below

  1. (zExt(L1) << shift1) | (zExt(L2) << shift2) -> zExt(L3) << shift1
  2. (? | (zExt(L1) << shift1)) | (zExt(L2) << shift2) -> ? | (zExt(L3) << shift1)

The pattern is indicative of the fact that the loads are being merged to a wider load and the only use of this pattern is with a wider load. In this case for a non-atomic/non-volatile loads reduce the pattern to a combined load which would improve the cost of inlining, unrolling, vectorization etc.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D127392

Files:
  llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
  llvm/test/Transforms/InstCombine/or-load.ll

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