llvm-project

fa2eabd7 - [SimplifyCFG] Hoist common code for switch multi-case destinations (#165700)

[SimplifyCFG] Hoist common code for switch multi-case destinations (#165700) Previously, hoistCommonCodeFromSuccessors did not support hoisting common code for multi-case destinations of `switch`. However, if all the predecessors of a given Succ are the same (i.e., multi-case destination), it is safe to hoist the common code from Succ to Pred, which is what this PR does. See discussion https://github.com/llvm/llvm-project/pull/165570#discussion_r2473290327. Alive2 proof: https://alive2.llvm.org/ce/z/cYuczq Optimization Impact: https://github.com/dtcxzyw/llvm-opt-benchmark/pull/3003