[all-commits] [llvm/llvm-project] 277666: X86: Mark the unused defs of FastISel selected div...

[Matt Arsenault via All-commits]

  Branch: refs/heads/users/arsenm/x86/fast-isel-divrem-dead-defs
  Home:   https://github.com/llvm/llvm-project
  Commit: 277666071fd1f64c0b5e408a8334f1fcecaeb7eb
      https://github.com/llvm/llvm-project/commit/277666071fd1f64c0b5e408a8334f1fcecaeb7eb
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2026-09-28 (Mon, 28 Sep 2026)

  Changed paths:
    M llvm/lib/Target/X86/X86FastISel.cpp
    A llvm/test/CodeGen/X86/fast-isel-divrem-dead-defs.ll

  Log Message:
  -----------
  X86: Mark the unused defs of FastISel selected div/rem dead

The DIV/IDIV instructions define the quotient, the remainder and the
flags, but X86FastISel::X86SelectDivRem only reads one of the quotient
and remainder. Mark the rest dead when building the instruction instead
of relying on later recomputatios.

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



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