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Copy pathiBranch.cpp
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51 lines (46 loc) · 1.9 KB
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//===-- iBranch.cpp - Implement the Branch instruction --------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the 'br' instruction, which can represent either a
// conditional or unconditional branch.
//
//===----------------------------------------------------------------------===//
#include "llvm/iTerminators.h"
#include "llvm/BasicBlock.h"
#include "llvm/Type.h"
BranchInst::BranchInst(BasicBlock *True, BasicBlock *False, Value *Cond,
Instruction *InsertBefore)
: TerminatorInst(Instruction::Br, InsertBefore) {
assert(True != 0 && "True branch destination may not be null!!!");
Operands.reserve(False ? 3 : 1);
Operands.push_back(Use(True, this));
if (False) {
Operands.push_back(Use(False, this));
Operands.push_back(Use(Cond, this));
}
assert(!!False == !!Cond &&
"Either both cond and false or neither can be specified!");
assert((Cond == 0 || Cond->getType() == Type::BoolTy) &&
"May only branch on boolean predicates!!!!");
}
BranchInst::BranchInst(BasicBlock *True, Instruction *InsertBefore)
: TerminatorInst(Instruction::Br, InsertBefore) {
assert(True != 0 && "True branch destination may not be null!!!");
Operands.reserve(1);
Operands.push_back(Use(True, this));
}
BranchInst::BranchInst(const BranchInst &BI) : TerminatorInst(Instruction::Br) {
Operands.reserve(BI.Operands.size());
Operands.push_back(Use(BI.Operands[0], this));
if (BI.Operands.size() != 1) {
assert(BI.Operands.size() == 3 && "BR can have 1 or 3 operands!");
Operands.push_back(Use(BI.Operands[1], this));
Operands.push_back(Use(BI.Operands[2], this));
}
}