[PATCH] D14514: [AArch64]Merge narrow zero stores to wider single store

[Jun Bum Lim via llvm-commits]

junbuml created this revision.
junbuml added reviewers: mcrosier, jmolloy, ab, mzolotukhin.
junbuml added subscribers: gberry, llvm-commits.
Herald added subscribers: rengolin, aemerson.

This change merges adjacent zero stores into a wider store.
For example :
  str wzr, [x0]
  str wzr, [x0, #4]
becomes
  str xzr, [x0]

http://reviews.llvm.org/D14514

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

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