[all-commits] [llvm/llvm-project] cb4453: [SelectionDAG] Prevent combination on inconsistent...

[XChy via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cb4453dc69d75064c9a82e9a6a9bf0d0ded4b204
      https://github.com/llvm/llvm-project/commit/cb4453dc69d75064c9a82e9a6a9bf0d0ded4b204
  Author: XChy <xxs_chy at outlook.com>
  Date:   2024-03-22 (Fri, 22 Mar 2024)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/test/CodeGen/X86/addcarry.ll

  Log Message:
  -----------
  [SelectionDAG] Prevent combination on inconsistent type in `combineCarryDiamond` (#84888)

Fixes #84831
When matching carry pattern with `getAsCarry`, it may produce different
type of carryout. This patch checks such case and does early exit.

I'm new to DAG, any suggestion is appreciated.



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