[all-commits] [llvm/llvm-project] 74c142: [AMDGPU] Propagate dead flag during pre-RA exec ma...

[Carl Ritson via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 74c14202d90b46dda64a2542602855727b7d7f60
      https://github.com/llvm/llvm-project/commit/74c14202d90b46dda64a2542602855727b7d7f60
  Author: Carl Ritson <carl.ritson at amd.com>
  Date:   2020-07-14 (Tue, 14 Jul 2020)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIOptimizeExecMaskingPreRA.cpp
    M llvm/test/CodeGen/AMDGPU/optimize-exec-masking-pre-ra.mir
    M llvm/test/CodeGen/AMDGPU/optimize-negated-cond-exec-masking-wave32.mir
    M llvm/test/CodeGen/AMDGPU/optimize-negated-cond-exec-masking.mir

  Log Message:
  -----------
  [AMDGPU] Propagate dead flag during pre-RA exec mask optimizations

Preserve SCC dead flags in SIOptimizeExecMaskingPreRA.
This helps with removing redundant s_andn2 instructions later.

Reviewed By: rampitec

Differential Revision: https://reviews.llvm.org/D83637