llvm::changeToUnreachable

Insert unreachable before an instruction and make the rest of the block dead.

Synopsis

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

unsigned int
changeToUnreachable(
    Instruction* I,
    bool PreserveLCSSA = false,
    DomTreeUpdater* DTU = nullptr,
    MemorySSAUpdater* MSSAU = nullptr);

Return Value

Number of instructions made unreachable or removed.

Parameters

Name

Description

Instruction before which unreachable is inserted.

PreserveLCSSA

Whether to preserve LCSSA form while rewriting.

DTU

Optional dominator‐tree updater for CFG changes.

MSSAU

Optional MemorySSA updater for deleted instructions.

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