[PATCH] D23359: [x86] X86ISelLowering zext(add_nuw(x, C)) --> add(zext(x), C_zext)

[Artur Pilipenko via llvm-commits]

apilipenko created this revision.
apilipenko added a reviewer: spatel.
apilipenko added a subscriber: llvm-commits.

Currently X86ISelLowering has a similar transformation for sexts:
sext(add_nsw(x, C)) --> add(sext(x), C_sext)
See D13757 for motivation. 

In this change I extend this code to handle zexts as well.

https://reviews.llvm.org/D23359

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/add-nuw-zext.ll

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