[all-commits] [llvm/llvm-project] becd41: [CGP] Despeculate ctlz/cttz with "illegal" integer...

[Sergei Barannikov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: becd418626e1ebedde6d095f7bb020e554251b15
      https://github.com/llvm/llvm-project/commit/becd418626e1ebedde6d095f7bb020e554251b15
  Author: Sergei Barannikov <barannikov88 at gmail.com>
  Date:   2025-04-29 (Tue, 29 Apr 2025)

  Changed paths:
    M llvm/lib/CodeGen/CodeGenPrepare.cpp
    M llvm/test/CodeGen/ARM/cttz.ll
    M llvm/test/CodeGen/RISCV/GlobalISel/rv32zbb.ll
    M llvm/test/CodeGen/RISCV/ctlz-cttz-ctpop.ll
    M llvm/test/CodeGen/RISCV/rv32xtheadbb.ll
    M llvm/test/CodeGen/RISCV/rv32zbb.ll
    M llvm/test/CodeGen/SPARC/ctlz.ll
    M llvm/test/CodeGen/SPARC/cttz.ll
    M llvm/test/CodeGen/X86/ctlo.ll
    M llvm/test/CodeGen/X86/ctlz.ll
    M llvm/test/CodeGen/X86/cttz.ll
    R llvm/test/CodeGen/X86/lzcnt-cmp.ll

  Log Message:
  -----------
  [CGP] Despeculate ctlz/cttz with "illegal" integer types (#137197)

The code below the removed check looks generic enough to support
arbitrary integer widths. This change helps 32-bit targets avoid
expensive expansion/libcalls in the case of zero input.

Pull Request: https://github.com/llvm/llvm-project/pull/137197



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