[all-commits] [llvm/llvm-project] 647fbc: [SelectionDAG] Prevent combination on inconsistent...

[XChy via All-commits]

  Branch: refs/heads/release/18.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 647fbc710840d87698d9dbc016a90c3aa634f532
      https://github.com/llvm/llvm-project/commit/647fbc710840d87698d9dbc016a90c3aa634f532
  Author: XChy <xxs_chy at outlook.com>
  Date:   2024-04-16 (Tue, 16 Apr 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.

(cherry picked from commit cb4453dc69d75064c9a82e9a6a9bf0d0ded4b204)



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