[all-commits] [llvm/llvm-project] d8bcb5: DAG: Preserve range metadata when load is narrowed...

[LU-JOHN via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d8bcb53780bf8e2f622380d5f4ccde96fa1d81a9
      https://github.com/llvm/llvm-project/commit/d8bcb53780bf8e2f622380d5f4ccde96fa1d81a9
  Author: LU-JOHN <John.Lu at amd.com>
  Date:   2025-02-26 (Wed, 26 Feb 2025)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/test/CodeGen/AMDGPU/shl64_reduce.ll

  Log Message:
  -----------
  DAG: Preserve range metadata when load is narrowed (#128144)

In DAGCombiner.cpp preserve range metadata when load is narrowed to load
LSBs if original range metadata bounds can fit in the narrower type.

Utilize preserved range metadata to reduce 64-bit shl to 32-bit shl.

---------

Signed-off-by: John Lu <John.Lu at amd.com>



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