[PATCH] D14183: [AArch64]Extend merging narrow loads into a wider load

[Jun Bum Lim via llvm-commits]

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

This change extends r251438 to handle more narrow load promotions
including byte type, unscaled, and signed. For example, this change will
convert :
  ldursh w1, [x0, #-2]
  ldurh  w2, [x0, #-4]
    into
  ldur  w2, [x0, #-4]
  asr   w1, w2, #16
  and   w2, w2, #0xffff


http://reviews.llvm.org/D14183

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

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