[PATCH] D27002: [AArch64] Handle more zero reg cases in foldMemoryOperandImpl

[Geoff Berry via llvm-commits]

gberry created this revision.
gberry added reviewers: qcolombet, MatzeB.
gberry added subscribers: t.p.northover, mcrosier, llvm-commits.
Herald added subscribers: rengolin, aemerson.

Extend AArch64 foldMemoryOperandImpl() to handle folding spills of COPYs like:

  %vreg0:sub_32<def,read-undef> = COPY %WZR; GPR64common:%vreg0

by generating:

  STRXui %XZR <fi#0>

These cases show up mostly due to zero extended values that get
coalesced and subsequently spilled.


https://reviews.llvm.org/D27002

Files:
  lib/Target/AArch64/AArch64InstrInfo.cpp
  lib/Target/AArch64/AArch64InstrInfo.h
  test/CodeGen/MIR/AArch64/spill-fold-zr.mir

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