[PATCH] D14596: [SROA] Choose more profitable type in findCommonType

[Guozhi Wei via llvm-commits]

Carrot updated this revision to Diff 43814.
Carrot added a comment.

This updated patch improves inst combine pass to handle following bitcast case

  TyA  ->  TyB    bitcast
  PHI
  TyB  ->  TyA    bitcast

The optimized code can skip the two bitcast operations, and use TyA directly in later instructions.

A test case is also added.


http://reviews.llvm.org/D14596

Files:
  lib/Transforms/InstCombine/InstCombineCasts.cpp
  lib/Transforms/InstCombine/InstCombineInternal.h
  test/Transforms/InstCombine/pr25342.ll

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