1 //===-- iBranch.cpp - Implement the Branch instruction -----------*- C++ -*--=//
3 // This file implements the 'br' instruction, which can represent either a
4 // conditional or unconditional branch.
6 //===----------------------------------------------------------------------===//
8 #include "llvm/iTerminators.h"
9 #include "llvm/BasicBlock.h"
11 #include "llvm/Type.h" // Only used for assertions...
12 #include "llvm/Assembly/Writer.h"
15 BranchInst::BranchInst(BasicBlock *True, BasicBlock *False, Value *Cond)
16 : TerminatorInst(Instruction::Br) {
17 assert(True != 0 && "True branch destination may not be null!!!");
18 Operands.reserve(False ? 3 : 1);
19 Operands.push_back(Use(True, this));
21 Operands.push_back(Use(False, this));
22 Operands.push_back(Use(Cond, this));
25 assert(!!False == !!Cond &&
26 "Either both cond and false or neither can be specified!");
29 if (Cond != 0 && Cond->getType() != Type::BoolTy)
30 cerr << "Bad Condition: " << Cond << endl;
32 assert((Cond == 0 || Cond->getType() == Type::BoolTy) &&
33 "May only branch on boolean predicates!!!!");
36 BranchInst::BranchInst(const BranchInst &BI) : TerminatorInst(Instruction::Br) {
37 Operands.reserve(BI.Operands.size());
38 Operands.push_back(Use(BI.Operands[0], this));
39 if (BI.Operands.size() != 1) {
40 assert(BI.Operands.size() == 3 && "BR can have 1 or 3 operands!");
41 Operands.push_back(Use(BI.Operands[1], this));
42 Operands.push_back(Use(BI.Operands[2], this));