[all-commits] [llvm/llvm-project] 99fb45: Mips: Mark MUL's existing HI0/LO0 defs dead in Fas...

[Matt Arsenault via All-commits]

  Branch: refs/heads/users/arsenm/mips/fastisel-mul-dead-hilo
  Home:   https://github.com/llvm/llvm-project
  Commit: 99fb45632987ae637aff3bd8d8f7a7f8a4cdf4b3
      https://github.com/llvm/llvm-project/commit/99fb45632987ae637aff3bd8d8f7a7f8a4cdf4b3
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2026-09-29 (Tue, 29 Sep 2026)

  Changed paths:
    M llvm/lib/Target/Mips/MipsFastISel.cpp
    A llvm/test/CodeGen/Mips/Fast-ISel/mul-dead-hilo.ll

  Log Message:
  -----------
  Mips: Mark MUL's existing HI0/LO0 defs dead in FastISel

Instead of appending a second, dead pair of implicit defs on top of the
ones the instruction description already provides, set the dead flag on
the existing operands. This drops the duplicate operands and avoids
later re-inference of dead.

Co-Authored-By: Claude Opus 5 <noreply at anthropic.com>



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