[PATCH] D39150: [globalisel][tablegen] Import stores and allow GISel to automatically substitute zero regs like WZR/XZR/$zero.

[Daniel Sanders via Phabricator via llvm-commits]

dsanders created this revision.
Herald added subscribers: igorb, javed.absar, kristof.beyls.

This patch enables the import of stores. Unfortunately, doing so by itself,
loses an optimization where storing 0 to memory makes use of WZR/XZR.

To mitigate this, this patch also introduces a new feature that allows register
classes to nominate a zero register. When this is done, GlobalISel will
substitute (G_CONSTANT 0) with the nominated register automatically


https://reviews.llvm.org/D39150

Files:
  include/llvm/CodeGen/GlobalISel/InstructionSelector.h
  include/llvm/CodeGen/GlobalISel/InstructionSelectorImpl.h
  include/llvm/Target/Target.td
  lib/Target/AArch64/AArch64RegisterInfo.td
  test/CodeGen/AArch64/GlobalISel/select-store.mir
  utils/TableGen/GlobalISelEmitter.cpp

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