[all-commits] [llvm/llvm-project] 146d44: [LSR] Don't require register reuse under postinc

[David Green via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 146d44c2511ab4d87f1d9c45dce56ad71427deab
      https://github.com/llvm/llvm-project/commit/146d44c2511ab4d87f1d9c45dce56ad71427deab
  Author: David Green <david.green at arm.com>
  Date:   2020-05-05 (Tue, 05 May 2020)

  Changed paths:
    M llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
    M llvm/test/CodeGen/Thumb2/mve-postinc-lsr.ll

  Log Message:
  -----------
  [LSR] Don't require register reuse under postinc

LSR has some logic that tries to aggressively reuse registers in
formula. This can lead to sub-optimal decision in complex loops where
the backend it trying to use shouldFavorPostInc. This disables the
re-use in those situations.

Differential Revision: https://reviews.llvm.org/D79301