[all-commits] [llvm/llvm-project] d7084f: [ARM][LowOverheadLoops] DoubleWidthResult instruct...

[Sam Parker via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: d7084fa34aea7ac9ddf18fbe25731d2c8d291db0
      https://github.com/llvm/llvm-project/commit/d7084fa34aea7ac9ddf18fbe25731d2c8d291db0
  Author: Sam Parker <sam.parker at arm.com>
  Date:   2020-03-27 (Fri, 27 Mar 2020)

  Changed paths:
    M llvm/lib/Target/ARM/ARMLowOverheadLoops.cpp
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/vaddv.mir

  Log Message:
  -----------
  [ARM][LowOverheadLoops] DoubleWidthResult instructions canGenerateZeros

Given that some instructions generate wider result elements than
their inputs, flag them as being able to generate non zeros in the
false lanes.

Differential Revision: https://reviews.llvm.org/D76766