[all-commits] [llvm/llvm-project] c1716e: [DAGCombiner][RISCV] CSE zext nneg and sext. (#82597)

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c1716e3fcf4e43b4a328731920f76b2fce9485d0
      https://github.com/llvm/llvm-project/commit/c1716e3fcf4e43b4a328731920f76b2fce9485d0
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2024-02-22 (Thu, 22 Feb 2024)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/test/CodeGen/RISCV/sext-zext-trunc.ll

  Log Message:
  -----------
  [DAGCombiner][RISCV] CSE zext nneg and sext. (#82597)

If we have a sext and a zext nneg with the same types and operand
we should combine them into the sext. We can't go the other way
because the nneg flag may only be valid in the context of the uses
of the zext nneg.



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