[PATCH] D49238: [InstCombine] add more SPFofSPF folding

[ChenZheng via Phabricator via llvm-commits]

shchenz created this revision.
shchenz added reviewers: spatel, echristo, nemanjai.
Herald added a subscriber: hiraditya.

This is from https://reviews.llvm.org/D48754.

Make matchSelectPattern() can recognize more abs pattern now. foldSPFofSPF() can also fold more SPF of SPF(abs/nabs) patterns.

Testcases are added at https://reviews.llvm.org/rL336902.


https://reviews.llvm.org/D49238

Files:
  llvm/lib/Analysis/ValueTracking.cpp
  llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
  llvm/test/Transforms/InstCombine/abs_abs.ll

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