[all-commits] [llvm/llvm-project] 50bfa8: [DAGCombiner] Fix scalarizeExtractedBinOp for some...

[David Sherwood via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 50bfa85d7968690aa305ae1b30f0214ced64c4d7
      https://github.com/llvm/llvm-project/commit/50bfa85d7968690aa305ae1b30f0214ced64c4d7
  Author: David Sherwood <david.sherwood at arm.com>
  Date:   2025-01-21 (Tue, 21 Jan 2025)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/test/CodeGen/AArch64/extract-vector-cmp.ll

  Log Message:
  -----------
  [DAGCombiner] Fix scalarizeExtractedBinOp for some SETCC cases (#123071)

PR https://github.com/llvm/llvm-project/pull/118823 added a
DAG combine for extracting elements of a vector returned from
SETCC, however it doesn't correctly deal with the case where
the vector element type is not i1. In this case we have to
take account of the boolean contents, which are represented
differently between vectors and scalars. The code now
explicitly performs an inreg sign extend in order to get the
same result.

Fixes https://github.com/llvm/llvm-project/issues/121372



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