[all-commits] [llvm/llvm-project] 6d7be7: [AArch64][GISel] Handle small vector fadd reductions.

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6d7be75e3990e34af8ea6660c92ddca853543006
      https://github.com/llvm/llvm-project/commit/6d7be75e3990e34af8ea6660c92ddca853543006
  Author: David Green <david.green at arm.com>
  Date:   2025-07-09 (Wed, 09 Jul 2025)

  Changed paths:
    M llvm/lib/Target/AArch64/GISel/AArch64LegalizerInfo.cpp
    M llvm/test/CodeGen/AArch64/vecreduce-fadd-strict.ll
    M llvm/test/CodeGen/AArch64/vecreduce-fadd.ll

  Log Message:
  -----------
  [AArch64][GISel] Handle small vector fadd reductions.

This adds some test cases for v2 and v3 half vector fadd reductions. In doing
so it appears that GlobalISel was having trouble lowering the smaller vector
sizes. Add some basic handling by widening to a power2 or scalarizing if
necessary. Larger vectors are still having problems as FewerElements currently
requires the number of elements to be modula the vector length.



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