[all-commits] [llvm/llvm-project] afd4df: [DAG] isKnownToBeAPowerOfTwo - add DemandedElts, O...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: afd4df07ab0262482829d4410a6bae9f2809d37b
      https://github.com/llvm/llvm-project/commit/afd4df07ab0262482829d4410a6bae9f2809d37b
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2026-02-15 (Sun, 15 Feb 2026)

  Changed paths:
    M llvm/include/llvm/CodeGen/SelectionDAG.h
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
    M llvm/unittests/Target/AArch64/AArch64SelectionDAGTest.cpp

  Log Message:
  -----------
  [DAG] isKnownToBeAPowerOfTwo - add DemandedElts, OrZero arguments and support for zero constants (#181485)

Update the signature for isKnownToBeAPowerOfTwo methods to take
DemandedElts and OrZero arguments.

So far all I've done is add OrZero support for constants
(scalars/buildvector/splat), with the intention to incrementally extend
support in the future (or spread the work as beginner GFI patches).

Similarly the DemandedElts argument is currently only used for constant
build vector tests but support can be extended in future patches.

Fixes #178938



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