[all-commits] [llvm/llvm-project] 6cfd38: [ARM] Fixup single source mla reductions.

[David Green via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 6cfd38d03d5fc3cde929ebf82529415595e8ef8e
      https://github.com/llvm/llvm-project/commit/6cfd38d03d5fc3cde929ebf82529415595e8ef8e
  Author: David Green <david.green at arm.com>
  Date:   2020-09-12 (Sat, 12 Sep 2020)

  Changed paths:
    M llvm/lib/Target/ARM/ARMISelLowering.cpp
    M llvm/test/CodeGen/Thumb2/mve-vecreduce-mla.ll
    M llvm/test/CodeGen/Thumb2/mve-vecreduce-mlapred.ll

  Log Message:
  -----------
  [ARM] Fixup single source mla reductions.

This fixes a complication on top of D87276. If we are sign extending
around a mul with the two operands that are the same, instcombine will
helpfully convert one of the sext to a zext. Reverse that so that we
again generate a reduction.

Differnetial Revision: https://reviews.llvm.org/D87287