[all-commits] [llvm/llvm-project] 3318a7: [InstCombine] Fold `(ct{t, l}z Pow2)` -> `Log2(Pow2...

[goldsteinn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3318a7248ae464af0abd0bea5515fa58c962b890
      https://github.com/llvm/llvm-project/commit/3318a7248ae464af0abd0bea5515fa58c962b890
  Author: goldsteinn <35538541+goldsteinn at users.noreply.github.com>
  Date:   2025-01-13 (Mon, 13 Jan 2025)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
    M llvm/test/Transforms/InstCombine/cttz.ll

  Log Message:
  -----------
  [InstCombine] Fold `(ct{t,l}z Pow2)` -> `Log2(Pow2)` (#122620)

- **[InstCombine] Add tests for folding `(ct{t,l}z Pow2)`; NFC**
- **[InstCombine] Fold `(ct{t,l}z Pow2)` -> `Log2(Pow2)`**

Do so we can find `Log2(Pow2)` for "free" with `takeLog2`

https://alive2.llvm.org/ce/z/CL77fo



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