[all-commits] [llvm/llvm-project] f74aed: [DAGCombiner] Add basic support for `trunc nsw/nuw...

[Yingwei Zheng via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f74aed793819bf9e0509e802f33c5e29c350540c
      https://github.com/llvm/llvm-project/commit/f74aed793819bf9e0509e802f33c5e29c350540c
  Author: Yingwei Zheng <dtcxzyw2333 at gmail.com>
  Date:   2024-11-07 (Thu, 07 Nov 2024)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
    M llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
    A llvm/test/CodeGen/AArch64/trunc-nsw-nuw.ll
    A llvm/test/CodeGen/RISCV/trunc-nsw-nuw.ll
    A llvm/test/CodeGen/X86/trunc-nsw-nuw.ll

  Log Message:
  -----------
  [DAGCombiner] Add basic support for `trunc nsw/nuw` (#113808)

This patch adds basic support for `trunc nsw/nuw` in SDAG. It will allow
DAGCombiner to further eliminate in-reg `zext/sext` instructions.



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