[PATCH] D143143: [AArch64] Reassociate sub(x, add(m1, m2)) to sub(sub(x, m1), m2)

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: SjoerdMeijer, samtebbs, fhahn, labrinea.
Herald added subscribers: StephenFan, hiraditya, kristof.beyls.
Herald added a project: All.
dmgreen requested review of this revision.
Herald added a project: LLVM.

The mid end will reassociate sub(sub(x, m1), m2) to sub(x, add(m1, m2)). This reassociates it back to allow the creation of more mls instructions.


https://reviews.llvm.org/D143143

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/arm64-vmul.ll
  llvm/test/CodeGen/AArch64/reassocmls.ll

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