[all-commits] [llvm/llvm-project] bf147c: [LSR] Fix for pre-indexed generated constant offset

[Stelios Ioannou via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: bf147c465352ed69f6fdaace26e9566bc442ade2
      https://github.com/llvm/llvm-project/commit/bf147c465352ed69f6fdaace26e9566bc442ade2
  Author: Stelios Ioannou <stelios.ioannou at arm.com>
  Date:   2021-04-15 (Thu, 15 Apr 2021)

  Changed paths:
    M llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
    M llvm/test/CodeGen/AMDGPU/cf-loop-on-constant.ll
    A llvm/test/Transforms/LoopStrengthReduce/AArch64/lsr-pre-inc-offset-check.ll
    M llvm/test/Transforms/LoopStrengthReduce/AMDGPU/atomics.ll
    M llvm/test/Transforms/LoopStrengthReduce/AMDGPU/different-addrspace-addressing-mode-loops.ll

  Log Message:
  -----------
  [LSR] Fix for pre-indexed generated constant offset

This patch changed the isLegalUse check to ensure that
LSRInstance::GenerateConstantOffsetsImpl generates an
offset that results in a legal addressing mode and
formula. The check is changed to look similar to the
assert check used for illegal formulas.

Differential Revision: https://reviews.llvm.org/D100383

Change-Id: Iffb9e32d59df96b8f072c00f6c339108159a009a