[all-commits] [llvm/llvm-project] c52255: [AArch64] Reassociate sub(x, add(m1, m2)) to sub(s...

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c52255d26a23df6ecf09f60ca3e3615467f16bbe
      https://github.com/llvm/llvm-project/commit/c52255d26a23df6ecf09f60ca3e3615467f16bbe
  Author: David Green <david.green at arm.com>
  Date:   2023-02-10 (Fri, 10 Feb 2023)

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

  Log Message:
  -----------
  [AArch64] Reassociate sub(x, add(m1, m2)) to sub(sub(x, m1), m2)

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.

Differential Revision: https://reviews.llvm.org/D143143