[all-commits] [llvm/llvm-project] 466503: X86: Add pattern for optimized BLSIC IR form (#209...

[Logan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 466503dcf2ae2e43126c1a6d8a5b204883d5b0c1
      https://github.com/llvm/llvm-project/commit/466503dcf2ae2e43126c1a6d8a5b204883d5b0c1
  Author: Logan <143111092+Logans-olo at users.noreply.github.com>
  Date:   2026-07-17 (Fri, 17 Jul 2026)

  Changed paths:
    M llvm/lib/Target/X86/X86InstrTBM.td
    M llvm/test/CodeGen/X86/tbm_patterns.ll

  Log Message:
  -----------
  X86: Add pattern for optimized BLSIC IR form (#209814)

Add DAG pattern to recognize the optimized IR form of BLSIC: (xor (and
x, -x), -1)

Fixes #209718 - matches the IR form produced after InstCombine
optimizations

Added tests for both 32-bit and 64-bit BLSIC patterns

Assisted by: Claude Code, helped me understand
pattern-matching/intrinsics, and some file structure. As well as how
testing for LLVM works.



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