[PATCH] D15354: [InstCombine] Extend peephole DSE to handle unordered atomics

[Philip Reames via llvm-commits]

reames created this revision.
reames added reviewers: jfb, hfinkel, sanjoy, dberlin, morisset, majnemer.
reames added a subscriber: llvm-commits.

This extends the same line of reasoning used in EarlyCSE w/http://reviews.llvm.org/D15352 to the DSE implementation in InstCombine.  

Key points: 
- We only remove unordered or simple stores.  
- The loads producing values consumed by dead stores don't influence whether the store is dead.

http://reviews.llvm.org/D15354

Files:
  lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
  test/Transforms/InstCombine/store.ll

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