[PATCH] D30416: [InstCombine] Redo reduceLoadOpStoreWidth in instcombine for bitfield store optimization.

[Wei Mi via Phabricator via llvm-commits]

wmi updated this revision to Diff 90589.
wmi added a reviewer: eli.friedman.
wmi added a comment.

Update patch according to Eli's comments.

- Add safety check to ensure no memory modifying inst bewteen load and store.
- Extend the shrinking funcationality to cover the cases Eli gave to me.
- Code refactoring so that different shrinking requirements can share the code as much as they can.


Repository:
  rL LLVM

https://reviews.llvm.org/D30416

Files:
  include/llvm/IR/PatternMatch.h
  lib/CodeGen/CodeGenPrepare.cpp
  test/CodeGen/ARM/bitfield-store.ll
  test/CodeGen/ARM/illegal-bitfield-loadstore.ll
  test/CodeGen/X86/bitfield-store.ll
  test/CodeGen/X86/illegal-bitfield-loadstore.ll

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