llvm::TargetInstrInfo::buildClearRegister

Insert a target‐specific instruction that clears Reg.

Synopsis

Declared in <llvm/CodeGen/TargetInstrInfo.h>

virtual
void
buildClearRegister(
    Register Reg,
    MachineBasicBlock& MBB,
    MachineBasicBlock::iterator Iter,
    DebugLoc& DL,
    bool AllowSideEffects = true) const;

Description

Insert an architecture‐specific instruction to clear a register. If you need to avoid sideeffects (e.g. avoid XOR on x86, which sets EFLAGS), set

AllowSideEffects to false.

Parameters

Name

Description

Reg

MBB

Machine basic block where code is inserted or analyzed.

Iter

Insertion point or peel iteration index.

Debug location for newly created instructions.

AllowSideEffects

If false, avoid clearing sequences that clobber flags or similar.

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