[all-commits] [llvm/llvm-project] d27802: [DAGCombiner] Fold setcc of trunc, generalizing so...

[Alex MacLean via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d27802a2173ab3d864d3bf1ac507a4acc656e457
      https://github.com/llvm/llvm-project/commit/d27802a2173ab3d864d3bf1ac507a4acc656e457
  Author: Alex MacLean <amaclean at nvidia.com>
  Date:   2025-08-05 (Tue, 05 Aug 2025)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
    M llvm/lib/Target/NVPTX/NVPTXInstrInfo.td
    M llvm/test/CodeGen/NVPTX/sext-setcc.ll
    A llvm/test/CodeGen/NVPTX/trunc-setcc.ll

  Log Message:
  -----------
  [DAGCombiner] Fold setcc of trunc, generalizing some NVPTX isel logic (#150270)

That change adds support for folding a SETCC when one or both of the
operands is a TRUNCATE with the appropriate no-wrap flags. This pattern
can occur when promoting i8 operations in NVPTX, and we currently have
some ISel rules to try to handle it.



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