[all-commits] [llvm/llvm-project] f988ef: [AMDGPU] Run early-cse<memssa> at the end of the f...

[michaelselehov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f988efbef5854243f9f518e9334dfee08ff2e1de
      https://github.com/llvm/llvm-project/commit/f988efbef5854243f9f518e9334dfee08ff2e1de
  Author: michaelselehov <michael.selehov at amd.com>
  Date:   2026-07-19 (Sun, 19 Jul 2026)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
    M llvm/test/CodeGen/AMDGPU/print-pipeline-passes.ll
    M llvm/test/Transforms/PhaseOrdering/AMDGPU/infer-address-space.ll

  Log Message:
  -----------
  [AMDGPU] Run early-cse<memssa> at the end of the full-LTO pipeline (#208461)

The regular (non-LTO) and ThinLTO function simplification pipelines run
an
EarlyCSE-with-MemorySSA pass near the start of the function pass
sequence, but
the full-LTO postlink pipeline does not. Without it, a redundant
load/store
round-trip can survive all the way to codegen; the later GVN/DSE in the
LTO
pipeline do not catch this particular pattern. 
    
Rather than touch the target-independent LTO pipeline, register
early-cse<memssa> through the AMDGPU FullLinkTimeOptimizationLast
extension
point, so it runs at the end of the full-LTO middle-end (before codegen)
only
for AMDGPU.
    
    Assisted-by: Claude Opus



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