[all-commits] [llvm/llvm-project] 7818c9: PowerPC: Remove LiveVariables dependency from PPCM...

[Matt Arsenault via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7818c91f7151a50df614fae9211eedfbfd32e938
      https://github.com/llvm/llvm-project/commit/7818c91f7151a50df614fae9211eedfbfd32e938
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2026-09-21 (Mon, 21 Sep 2026)

  Changed paths:
    M llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
    M llvm/lib/Target/PowerPC/PPCInstrInfo.h
    M llvm/lib/Target/PowerPC/PPCMIPeephole.cpp
    M llvm/lib/Target/PowerPC/PPCTargetMachine.cpp
    M llvm/test/CodeGen/PowerPC/O0-pipeline.ll
    M llvm/test/CodeGen/PowerPC/O3-pipeline.ll
    M llvm/test/CodeGen/PowerPC/convert-ri-addi-to-ri.mir
    M llvm/test/CodeGen/PowerPC/convert-rr-to-ri-instrs-out-of-range.mir
    M llvm/test/CodeGen/PowerPC/convert-rr-to-ri-instrs.mir
    M llvm/test/CodeGen/PowerPC/fixup-kill-dead-flag-crash.mir
    M llvm/test/CodeGen/PowerPC/fold-rlwinm.mir
    M llvm/test/CodeGen/PowerPC/fold-rot-and-peephole.mir
    M llvm/test/CodeGen/PowerPC/jump-tables-collapse-rotate-remove-SrcMI.mir
    M llvm/test/CodeGen/PowerPC/mi-peephole-forwarding-undef.mir
    M llvm/test/CodeGen/PowerPC/mi-peephole.mir
    M llvm/test/CodeGen/PowerPC/peephole-combineRLWINM-liveness.mir
    M llvm/test/CodeGen/PowerPC/peephole-counter-XToI.mir
    M llvm/test/CodeGen/PowerPC/peephole-counter-perOp.mir
    M llvm/test/CodeGen/PowerPC/peephole-livevars-tracking.mir
    M llvm/test/CodeGen/PowerPC/peephole-miscompile-extswsli.mir
    M llvm/test/CodeGen/PowerPC/rlwinm_rldicl_to_andi.mir
    M llvm/test/CodeGen/PowerPC/sext_elimination.mir

  Log Message:
  -----------
  PowerPC: Remove LiveVariables dependency from PPCMIPeephole (#222416)

PPCMIPeephole only used LiveVariables to keep kill/dead flags valid
after its transforms, and made no real use of the analysis.

A later LiveVariables run recomputes those flags from scratch anyway, so
just clear possbly stale kill/dead flags on changed registers.

PPCMIPeephole was the only user of LiveVariables at this point in the
pipeline, so also drop the explicit LiveVariables run before
PPCTLSDynamicCallPass, whose comment references a > 10 year old build
bot failure.

Co-authored-by: Claude (Claude-Opus-4.8)



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