llvm::SplitBlockAndInsertIfThenElse

Split a block and insert optional then/else blocks at an instruction.

Synopsis

Declared in <llvm/Transforms/Utils/BasicBlockUtils.h>

void
SplitBlockAndInsertIfThenElse(
    Value* Cond,
    Instruction* SplitBefore,
    BasicBlock** ThenBlock,
    BasicBlock** ElseBlock,
    bool UnreachableThen = false,
    bool UnreachableElse = false,
    MDNode* BranchWeights = nullptr,
    DomTreeUpdater* DTU = nullptr,
    LoopInfo* LI = nullptr);

Parameters

Name

Description

Cond

Condition controlling the inserted branch.

SplitBefore

Instruction at which the block is split.

ThenBlock

In/out then‐block pointer controlling then‐path creation.

ElseBlock

In/out else‐block pointer controlling else‐path creation.

UnreachableThen

Whether a newly created then‐block ends with unreachable.

UnreachableElse

Whether a newly created else‐block ends with unreachable.

BranchWeights

Optional branch‐weight metadata for the new branch.

DTU

Optional dominator‐tree updater for CFG changes.

Optional loop info to update.

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