| //===-- iOperators.cpp - Implement binary Operators ------------*- C++ -*--===// |
| // |
| // This file implements the nontrivial binary operator instructions. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/iOperators.h" |
| #include "llvm/Type.h" |
| #include "llvm/Constants.h" |
| |
| //===----------------------------------------------------------------------===// |
| // BinaryOperator Class |
| //===----------------------------------------------------------------------===// |
| |
| BinaryOperator *BinaryOperator::create(BinaryOps Op, Value *S1, Value *S2, |
| const std::string &Name) { |
| switch (Op) { |
| // Binary comparison operators... |
| case SetLT: case SetGT: case SetLE: |
| case SetGE: case SetEQ: case SetNE: |
| return new SetCondInst(Op, S1, S2, Name); |
| |
| default: |
| return new GenericBinaryInst(Op, S1, S2, Name); |
| } |
| } |
| |
| BinaryOperator *BinaryOperator::createNeg(Value *Op, const std::string &Name) { |
| return new GenericBinaryInst(Instruction::Sub, |
| Constant::getNullValue(Op->getType()), Op, Name); |
| } |
| |
| BinaryOperator *BinaryOperator::createNot(Value *Op, const std::string &Name) { |
| return new GenericBinaryInst(Instruction::Xor, Op, |
| ConstantIntegral::getAllOnesValue(Op->getType()), |
| Name); |
| } |
| |
| |
| // isConstantAllOnes - Helper function for several functions below |
| static inline bool isConstantAllOnes(const Value *V) { |
| return isa<ConstantIntegral>(V) &&cast<ConstantIntegral>(V)->isAllOnesValue(); |
| } |
| |
| bool BinaryOperator::isNeg(const Value *V) { |
| if (const BinaryOperator *Bop = dyn_cast<BinaryOperator>(V)) |
| return Bop->getOpcode() == Instruction::Sub && |
| isa<Constant>(Bop->getOperand(0)) && cast<Constant>(V)->isNullValue(); |
| return false; |
| } |
| |
| bool BinaryOperator::isNot(const Value *V) { |
| if (const BinaryOperator *Bop = dyn_cast<BinaryOperator>(V)) |
| return (Bop->getOpcode() == Instruction::Xor && |
| (isConstantAllOnes(Bop->getOperand(1)) || |
| isConstantAllOnes(Bop->getOperand(0)))); |
| return false; |
| } |
| |
| Value *BinaryOperator::getNegArgument(BinaryOperator *Bop) { |
| assert(isNeg(Bop) && "getNegArgument from non-'neg' instruction!"); |
| return Bop->getOperand(1); |
| } |
| |
| const Value *BinaryOperator::getNegArgument(const BinaryOperator *Bop) { |
| return getNegArgument((BinaryOperator*)Bop); |
| } |
| |
| Value *BinaryOperator::getNotArgument(BinaryOperator *Bop) { |
| assert(isNot(Bop) && "getNotArgument on non-'not' instruction!"); |
| Value *Op0 = Bop->getOperand(0); |
| Value *Op1 = Bop->getOperand(1); |
| if (isConstantAllOnes(Op0)) return Op1; |
| |
| assert(isConstantAllOnes(Op1)); |
| return Op0; |
| } |
| |
| const Value *BinaryOperator::getNotArgument(const BinaryOperator *Bop) { |
| return getNotArgument((BinaryOperator*)Bop); |
| } |
| |
| |
| // swapOperands - Exchange the two operands to this instruction. This |
| // instruction is safe to use on any binary instruction and does not |
| // modify the semantics of the instruction. If the instruction is |
| // order dependant (SetLT f.e.) the opcode is changed. |
| // |
| bool BinaryOperator::swapOperands() { |
| if (SetCondInst *SCI = dyn_cast<SetCondInst>(this)) { |
| iType = SCI->getSwappedCondition(); |
| std::swap(Operands[0], Operands[1]); |
| return false; |
| } |
| |
| switch (getOpcode()) { |
| // Instructions that don't need opcode modification |
| case Add: case Mul: |
| case And: case Xor: |
| case Or: |
| // Error on the side of caution |
| default: |
| return true; |
| } |
| std::swap(Operands[0], Operands[1]); |
| return false; |
| } |
| |
| |
| //===----------------------------------------------------------------------===// |
| // SetCondInst Class |
| //===----------------------------------------------------------------------===// |
| |
| SetCondInst::SetCondInst(BinaryOps opType, Value *S1, Value *S2, |
| const std::string &Name) |
| : BinaryOperator(opType, S1, S2, Name) { |
| |
| OpType = opType; |
| setType(Type::BoolTy); // setcc instructions always return bool type. |
| |
| // Make sure it's a valid type... |
| assert(getOpcodeName() != 0); |
| } |
| |
| // getInverseCondition - Return the inverse of the current condition opcode. |
| // For example seteq -> setne, setgt -> setle, setlt -> setge, etc... |
| // |
| Instruction::BinaryOps SetCondInst::getInverseCondition(BinaryOps Opcode) { |
| switch (Opcode) { |
| default: |
| assert(0 && "Unknown setcc opcode!"); |
| case SetEQ: return SetNE; |
| case SetNE: return SetEQ; |
| case SetGT: return SetLE; |
| case SetLT: return SetGE; |
| case SetGE: return SetLT; |
| case SetLE: return SetGT; |
| } |
| } |
| |
| // getSwappedCondition - Return the condition opcode that would be the result |
| // of exchanging the two operands of the setcc instruction without changing |
| // the result produced. Thus, seteq->seteq, setle->setge, setlt->setgt, etc. |
| // |
| Instruction::BinaryOps SetCondInst::getSwappedCondition(BinaryOps Opcode) { |
| switch (Opcode) { |
| default: assert(0 && "Unknown setcc instruction!"); |
| case SetEQ: case SetNE: return Opcode; |
| case SetGT: return SetLT; |
| case SetLT: return SetGT; |
| case SetGE: return SetLE; |
| case SetLE: return SetGE; |
| } |
| } |