[PATCH] D18570: [AArch64] Handle missing store pair opportunity

[Jun Bum Lim via llvm-commits]

junbuml created this revision.
junbuml added reviewers: mcrosier, jmolloy, t.p.northover.
junbuml added a subscriber: llvm-commits.
Herald added subscribers: mcrosier, rengolin, aemerson.

This change will handle missing store pair opportunity where the first store
instruction stores zero followed by the non-zero store. For example, this change
will convert :
    
  str wzr, [x8]
  str w1, [x8, #4]
into:
  stp wzr, w1, [x8]


http://reviews.llvm.org/D18570

Files:
  lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
  test/CodeGen/AArch64/arm64-narrow-ldst-merge.ll

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