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Header files will be on the way. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9298 91177308-0d34-0410-b5e6-96231b3b80d8
641 lines
26 KiB
C++
641 lines
26 KiB
C++
//===- ConstantHandling.cpp - Implement ConstantHandling.h ----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the various intrinsic operations, on constant values.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ConstantHandling.h"
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#include "llvm/iPHINode.h"
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#include "llvm/InstrTypes.h"
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#include "llvm/DerivedTypes.h"
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#include <cmath>
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AnnotationID ConstRules::AID(AnnotationManager::getID("opt::ConstRules",
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&ConstRules::find));
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// ConstantFoldInstruction - Attempt to constant fold the specified instruction.
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// If successful, the constant result is returned, if not, null is returned.
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//
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Constant *ConstantFoldInstruction(Instruction *I) {
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if (PHINode *PN = dyn_cast<PHINode>(I)) {
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if (PN->getNumIncomingValues() == 0)
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return Constant::getNullValue(PN->getType());
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Constant *Result = dyn_cast<Constant>(PN->getIncomingValue(0));
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if (Result == 0) return 0;
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// Handle PHI nodes specially here...
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for (unsigned i = 1, e = PN->getNumIncomingValues(); i != e; ++i)
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if (PN->getIncomingValue(i) != Result)
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return 0; // Not all the same incoming constants...
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// If we reach here, all incoming values are the same constant.
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return Result;
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}
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Constant *Op0 = 0;
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Constant *Op1 = 0;
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if (I->getNumOperands() != 0) { // Get first operand if it's a constant...
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Op0 = dyn_cast<Constant>(I->getOperand(0));
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if (Op0 == 0) return 0; // Not a constant?, can't fold
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if (I->getNumOperands() != 1) { // Get second operand if it's a constant...
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Op1 = dyn_cast<Constant>(I->getOperand(1));
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if (Op1 == 0) return 0; // Not a constant?, can't fold
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}
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}
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if (isa<BinaryOperator>(I))
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return ConstantExpr::get(I->getOpcode(), Op0, Op1);
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switch (I->getOpcode()) {
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case Instruction::Cast:
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return ConstantExpr::getCast(Op0, I->getType());
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case Instruction::Shl:
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case Instruction::Shr:
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return ConstantExpr::getShift(I->getOpcode(), Op0, Op1);
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case Instruction::GetElementPtr: {
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std::vector<Constant*> IdxList;
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IdxList.reserve(I->getNumOperands()-1);
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if (Op1) IdxList.push_back(Op1);
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for (unsigned i = 2, e = I->getNumOperands(); i != e; ++i)
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if (Constant *C = dyn_cast<Constant>(I->getOperand(i)))
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IdxList.push_back(C);
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else
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return 0; // Non-constant operand
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return ConstantExpr::getGetElementPtr(Op0, IdxList);
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}
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default:
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return 0;
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}
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}
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static unsigned getSize(const Type *Ty) {
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unsigned S = Ty->getPrimitiveSize();
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return S ? S : 8; // Treat pointers at 8 bytes
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}
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Constant *ConstantFoldCastInstruction(const Constant *V, const Type *DestTy) {
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if (V->getType() == DestTy) return (Constant*)V;
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if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
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if (CE->getOpcode() == Instruction::Cast) {
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Constant *Op = const_cast<Constant*>(CE->getOperand(0));
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// Try to not produce a cast of a cast, which is almost always redundant.
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if (!Op->getType()->isFloatingPoint() &&
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!CE->getType()->isFloatingPoint() &&
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!DestTy->getType()->isFloatingPoint()) {
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unsigned S1 = getSize(Op->getType()), S2 = getSize(CE->getType());
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unsigned S3 = getSize(DestTy);
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if (Op->getType() == DestTy && S3 >= S2)
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return Op;
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if (S1 >= S2 && S2 >= S3)
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return ConstantExpr::getCast(Op, DestTy);
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if (S1 <= S2 && S2 >= S3 && S1 <= S3)
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return ConstantExpr::getCast(Op, DestTy);
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}
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} else if (CE->getOpcode() == Instruction::GetElementPtr) {
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// If all of the indexes in the GEP are null values, there is no pointer
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// adjustment going on. We might as well cast the source pointer.
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bool isAllNull = true;
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for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i)
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if (!CE->getOperand(i)->isNullValue()) {
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isAllNull = false;
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break;
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}
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if (isAllNull)
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return ConstantExpr::getCast(CE->getOperand(0), DestTy);
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}
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return ConstRules::get(*V, *V)->castTo(V, DestTy);
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}
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Constant *ConstantFoldBinaryInstruction(unsigned Opcode, const Constant *V1,
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const Constant *V2) {
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switch (Opcode) {
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case Instruction::Add: return *V1 + *V2;
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case Instruction::Sub: return *V1 - *V2;
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case Instruction::Mul: return *V1 * *V2;
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case Instruction::Div: return *V1 / *V2;
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case Instruction::Rem: return *V1 % *V2;
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case Instruction::And: return *V1 & *V2;
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case Instruction::Or: return *V1 | *V2;
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case Instruction::Xor: return *V1 ^ *V2;
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case Instruction::SetEQ: return *V1 == *V2;
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case Instruction::SetNE: return *V1 != *V2;
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case Instruction::SetLE: return *V1 <= *V2;
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case Instruction::SetGE: return *V1 >= *V2;
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case Instruction::SetLT: return *V1 < *V2;
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case Instruction::SetGT: return *V1 > *V2;
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}
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return 0;
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}
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Constant *ConstantFoldShiftInstruction(unsigned Opcode, const Constant *V1,
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const Constant *V2) {
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switch (Opcode) {
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case Instruction::Shl: return *V1 << *V2;
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case Instruction::Shr: return *V1 >> *V2;
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default: return 0;
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}
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}
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Constant *ConstantFoldGetElementPtr(const Constant *C,
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const std::vector<Constant*> &IdxList) {
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if (IdxList.size() == 0 ||
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(IdxList.size() == 1 && IdxList[0]->isNullValue()))
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return const_cast<Constant*>(C);
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// TODO If C is null and all idx's are null, return null of the right type.
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if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
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// Combine Indices - If the source pointer to this getelementptr instruction
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// is a getelementptr instruction, combine the indices of the two
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// getelementptr instructions into a single instruction.
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//
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if (CE->getOpcode() == Instruction::GetElementPtr) {
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if (CE->getOperand(CE->getNumOperands()-1)->getType() == Type::LongTy) {
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std::vector<Constant*> NewIndices;
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NewIndices.reserve(IdxList.size() + CE->getNumOperands());
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for (unsigned i = 1, e = CE->getNumOperands()-1; i != e; ++i)
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NewIndices.push_back(cast<Constant>(CE->getOperand(i)));
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// Add the last index of the source with the first index of the new GEP.
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Constant *Combined =
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ConstantExpr::get(Instruction::Add, IdxList[0],
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CE->getOperand(CE->getNumOperands()-1));
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NewIndices.push_back(Combined);
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NewIndices.insert(NewIndices.end(), IdxList.begin()+1, IdxList.end());
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return ConstantExpr::getGetElementPtr(CE->getOperand(0), NewIndices);
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}
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}
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// Implement folding of:
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// int* getelementptr ([2 x int]* cast ([3 x int]* %X to [2 x int]*),
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// long 0, long 0)
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// To: int* getelementptr ([3 x int]* %X, long 0, long 0)
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//
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if (CE->getOpcode() == Instruction::Cast && IdxList.size() > 1 &&
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IdxList[0]->isNullValue())
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if (const PointerType *SPT =
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dyn_cast<PointerType>(CE->getOperand(0)->getType()))
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if (const ArrayType *SAT = dyn_cast<ArrayType>(SPT->getElementType()))
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if (const ArrayType *CAT =
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dyn_cast<ArrayType>(cast<PointerType>(C->getType())->getElementType()))
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if (CAT->getElementType() == SAT->getElementType())
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return ConstantExpr::getGetElementPtr(
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(Constant*)CE->getOperand(0), IdxList);
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}
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return 0;
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}
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//===----------------------------------------------------------------------===//
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// TemplateRules Class
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//===----------------------------------------------------------------------===//
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//
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// TemplateRules - Implement a subclass of ConstRules that provides all
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// operations as noops. All other rules classes inherit from this class so
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// that if functionality is needed in the future, it can simply be added here
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// and to ConstRules without changing anything else...
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//
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// This class also provides subclasses with typesafe implementations of methods
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// so that don't have to do type casting.
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//
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template<class ArgType, class SubClassName>
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class TemplateRules : public ConstRules {
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//===--------------------------------------------------------------------===//
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// Redirecting functions that cast to the appropriate types
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//===--------------------------------------------------------------------===//
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virtual Constant *add(const Constant *V1, const Constant *V2) const {
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return SubClassName::Add((const ArgType *)V1, (const ArgType *)V2);
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}
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virtual Constant *sub(const Constant *V1, const Constant *V2) const {
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return SubClassName::Sub((const ArgType *)V1, (const ArgType *)V2);
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}
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virtual Constant *mul(const Constant *V1, const Constant *V2) const {
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return SubClassName::Mul((const ArgType *)V1, (const ArgType *)V2);
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}
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virtual Constant *div(const Constant *V1, const Constant *V2) const {
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return SubClassName::Div((const ArgType *)V1, (const ArgType *)V2);
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}
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virtual Constant *rem(const Constant *V1, const Constant *V2) const {
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return SubClassName::Rem((const ArgType *)V1, (const ArgType *)V2);
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}
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virtual Constant *op_and(const Constant *V1, const Constant *V2) const {
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return SubClassName::And((const ArgType *)V1, (const ArgType *)V2);
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}
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virtual Constant *op_or(const Constant *V1, const Constant *V2) const {
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return SubClassName::Or((const ArgType *)V1, (const ArgType *)V2);
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}
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virtual Constant *op_xor(const Constant *V1, const Constant *V2) const {
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return SubClassName::Xor((const ArgType *)V1, (const ArgType *)V2);
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}
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virtual Constant *shl(const Constant *V1, const Constant *V2) const {
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return SubClassName::Shl((const ArgType *)V1, (const ArgType *)V2);
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}
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virtual Constant *shr(const Constant *V1, const Constant *V2) const {
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return SubClassName::Shr((const ArgType *)V1, (const ArgType *)V2);
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}
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virtual ConstantBool *lessthan(const Constant *V1,
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const Constant *V2) const {
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return SubClassName::LessThan((const ArgType *)V1, (const ArgType *)V2);
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}
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// Casting operators. ick
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virtual ConstantBool *castToBool(const Constant *V) const {
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return SubClassName::CastToBool((const ArgType*)V);
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}
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virtual ConstantSInt *castToSByte(const Constant *V) const {
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return SubClassName::CastToSByte((const ArgType*)V);
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}
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virtual ConstantUInt *castToUByte(const Constant *V) const {
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return SubClassName::CastToUByte((const ArgType*)V);
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}
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virtual ConstantSInt *castToShort(const Constant *V) const {
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return SubClassName::CastToShort((const ArgType*)V);
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}
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virtual ConstantUInt *castToUShort(const Constant *V) const {
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return SubClassName::CastToUShort((const ArgType*)V);
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}
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virtual ConstantSInt *castToInt(const Constant *V) const {
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return SubClassName::CastToInt((const ArgType*)V);
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}
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virtual ConstantUInt *castToUInt(const Constant *V) const {
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return SubClassName::CastToUInt((const ArgType*)V);
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}
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virtual ConstantSInt *castToLong(const Constant *V) const {
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return SubClassName::CastToLong((const ArgType*)V);
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}
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virtual ConstantUInt *castToULong(const Constant *V) const {
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return SubClassName::CastToULong((const ArgType*)V);
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}
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virtual ConstantFP *castToFloat(const Constant *V) const {
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return SubClassName::CastToFloat((const ArgType*)V);
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}
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virtual ConstantFP *castToDouble(const Constant *V) const {
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return SubClassName::CastToDouble((const ArgType*)V);
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}
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virtual Constant *castToPointer(const Constant *V,
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const PointerType *Ty) const {
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return SubClassName::CastToPointer((const ArgType*)V, Ty);
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}
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//===--------------------------------------------------------------------===//
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// Default "noop" implementations
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//===--------------------------------------------------------------------===//
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static Constant *Add(const ArgType *V1, const ArgType *V2) { return 0; }
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static Constant *Sub(const ArgType *V1, const ArgType *V2) { return 0; }
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static Constant *Mul(const ArgType *V1, const ArgType *V2) { return 0; }
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static Constant *Div(const ArgType *V1, const ArgType *V2) { return 0; }
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static Constant *Rem(const ArgType *V1, const ArgType *V2) { return 0; }
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static Constant *And(const ArgType *V1, const ArgType *V2) { return 0; }
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static Constant *Or (const ArgType *V1, const ArgType *V2) { return 0; }
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static Constant *Xor(const ArgType *V1, const ArgType *V2) { return 0; }
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static Constant *Shl(const ArgType *V1, const ArgType *V2) { return 0; }
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static Constant *Shr(const ArgType *V1, const ArgType *V2) { return 0; }
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static ConstantBool *LessThan(const ArgType *V1, const ArgType *V2) {
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return 0;
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}
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// Casting operators. ick
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static ConstantBool *CastToBool (const Constant *V) { return 0; }
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static ConstantSInt *CastToSByte (const Constant *V) { return 0; }
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static ConstantUInt *CastToUByte (const Constant *V) { return 0; }
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static ConstantSInt *CastToShort (const Constant *V) { return 0; }
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static ConstantUInt *CastToUShort(const Constant *V) { return 0; }
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static ConstantSInt *CastToInt (const Constant *V) { return 0; }
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static ConstantUInt *CastToUInt (const Constant *V) { return 0; }
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static ConstantSInt *CastToLong (const Constant *V) { return 0; }
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static ConstantUInt *CastToULong (const Constant *V) { return 0; }
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static ConstantFP *CastToFloat (const Constant *V) { return 0; }
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static ConstantFP *CastToDouble(const Constant *V) { return 0; }
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static Constant *CastToPointer(const Constant *,
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const PointerType *) {return 0;}
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};
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//===----------------------------------------------------------------------===//
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// EmptyRules Class
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//===----------------------------------------------------------------------===//
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//
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// EmptyRules provides a concrete base class of ConstRules that does nothing
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//
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struct EmptyRules : public TemplateRules<Constant, EmptyRules> {
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};
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//===----------------------------------------------------------------------===//
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// BoolRules Class
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//===----------------------------------------------------------------------===//
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//
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// BoolRules provides a concrete base class of ConstRules for the 'bool' type.
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//
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struct BoolRules : public TemplateRules<ConstantBool, BoolRules> {
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static ConstantBool *LessThan(const ConstantBool *V1, const ConstantBool *V2){
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return ConstantBool::get(V1->getValue() < V2->getValue());
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}
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static Constant *And(const ConstantBool *V1, const ConstantBool *V2) {
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return ConstantBool::get(V1->getValue() & V2->getValue());
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}
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static Constant *Or(const ConstantBool *V1, const ConstantBool *V2) {
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return ConstantBool::get(V1->getValue() | V2->getValue());
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}
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static Constant *Xor(const ConstantBool *V1, const ConstantBool *V2) {
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return ConstantBool::get(V1->getValue() ^ V2->getValue());
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}
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// Casting operators. ick
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#define DEF_CAST(TYPE, CLASS, CTYPE) \
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static CLASS *CastTo##TYPE (const ConstantBool *V) { \
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return CLASS::get(Type::TYPE##Ty, (CTYPE)(bool)V->getValue()); \
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}
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DEF_CAST(Bool , ConstantBool, bool)
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DEF_CAST(SByte , ConstantSInt, signed char)
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DEF_CAST(UByte , ConstantUInt, unsigned char)
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DEF_CAST(Short , ConstantSInt, signed short)
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DEF_CAST(UShort, ConstantUInt, unsigned short)
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DEF_CAST(Int , ConstantSInt, signed int)
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DEF_CAST(UInt , ConstantUInt, unsigned int)
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DEF_CAST(Long , ConstantSInt, int64_t)
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DEF_CAST(ULong , ConstantUInt, uint64_t)
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DEF_CAST(Float , ConstantFP , float)
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DEF_CAST(Double, ConstantFP , double)
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#undef DEF_CAST
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};
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//===----------------------------------------------------------------------===//
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// PointerRules Class
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//===----------------------------------------------------------------------===//
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//
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// PointerRules provides a concrete base class of ConstRules for pointer types
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//
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struct PointerRules : public TemplateRules<ConstantPointer, PointerRules> {
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static ConstantBool *CastToBool (const Constant *V) {
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if (V->isNullValue()) return ConstantBool::False;
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return 0; // Can't const prop other types of pointers
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}
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static ConstantSInt *CastToSByte (const Constant *V) {
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if (V->isNullValue()) return ConstantSInt::get(Type::SByteTy, 0);
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return 0; // Can't const prop other types of pointers
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}
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static ConstantUInt *CastToUByte (const Constant *V) {
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if (V->isNullValue()) return ConstantUInt::get(Type::UByteTy, 0);
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return 0; // Can't const prop other types of pointers
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}
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static ConstantSInt *CastToShort (const Constant *V) {
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if (V->isNullValue()) return ConstantSInt::get(Type::ShortTy, 0);
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return 0; // Can't const prop other types of pointers
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}
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static ConstantUInt *CastToUShort(const Constant *V) {
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if (V->isNullValue()) return ConstantUInt::get(Type::UShortTy, 0);
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return 0; // Can't const prop other types of pointers
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}
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static ConstantSInt *CastToInt (const Constant *V) {
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if (V->isNullValue()) return ConstantSInt::get(Type::IntTy, 0);
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return 0; // Can't const prop other types of pointers
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}
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static ConstantUInt *CastToUInt (const Constant *V) {
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if (V->isNullValue()) return ConstantUInt::get(Type::UIntTy, 0);
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return 0; // Can't const prop other types of pointers
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}
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static ConstantSInt *CastToLong (const Constant *V) {
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if (V->isNullValue()) return ConstantSInt::get(Type::LongTy, 0);
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return 0; // Can't const prop other types of pointers
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}
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static ConstantUInt *CastToULong (const Constant *V) {
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if (V->isNullValue()) return ConstantUInt::get(Type::ULongTy, 0);
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return 0; // Can't const prop other types of pointers
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}
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static ConstantFP *CastToFloat (const Constant *V) {
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if (V->isNullValue()) return ConstantFP::get(Type::FloatTy, 0);
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return 0; // Can't const prop other types of pointers
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}
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static ConstantFP *CastToDouble(const Constant *V) {
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if (V->isNullValue()) return ConstantFP::get(Type::DoubleTy, 0);
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return 0; // Can't const prop other types of pointers
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}
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static Constant *CastToPointer(const ConstantPointer *V,
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const PointerType *PTy) {
|
|
if (V->getType() == PTy)
|
|
return const_cast<ConstantPointer*>(V); // Allow cast %PTy %ptr to %PTy
|
|
if (V->isNullValue())
|
|
return ConstantPointerNull::get(PTy);
|
|
return 0; // Can't const prop other types of pointers
|
|
}
|
|
};
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// DirectRules Class
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// DirectRules provides a concrete base classes of ConstRules for a variety of
|
|
// different types. This allows the C++ compiler to automatically generate our
|
|
// constant handling operations in a typesafe and accurate manner.
|
|
//
|
|
template<class ConstantClass, class BuiltinType, Type **Ty, class SuperClass>
|
|
struct DirectRules : public TemplateRules<ConstantClass, SuperClass> {
|
|
static Constant *Add(const ConstantClass *V1, const ConstantClass *V2) {
|
|
BuiltinType R = (BuiltinType)V1->getValue() + (BuiltinType)V2->getValue();
|
|
return ConstantClass::get(*Ty, R);
|
|
}
|
|
|
|
static Constant *Sub(const ConstantClass *V1, const ConstantClass *V2) {
|
|
BuiltinType R = (BuiltinType)V1->getValue() - (BuiltinType)V2->getValue();
|
|
return ConstantClass::get(*Ty, R);
|
|
}
|
|
|
|
static Constant *Mul(const ConstantClass *V1, const ConstantClass *V2) {
|
|
BuiltinType R = (BuiltinType)V1->getValue() * (BuiltinType)V2->getValue();
|
|
return ConstantClass::get(*Ty, R);
|
|
}
|
|
|
|
static Constant *Div(const ConstantClass *V1, const ConstantClass *V2) {
|
|
if (V2->isNullValue()) return 0;
|
|
BuiltinType R = (BuiltinType)V1->getValue() / (BuiltinType)V2->getValue();
|
|
return ConstantClass::get(*Ty, R);
|
|
}
|
|
|
|
static ConstantBool *LessThan(const ConstantClass *V1,
|
|
const ConstantClass *V2) {
|
|
bool R = (BuiltinType)V1->getValue() < (BuiltinType)V2->getValue();
|
|
return ConstantBool::get(R);
|
|
}
|
|
|
|
static Constant *CastToPointer(const ConstantClass *V,
|
|
const PointerType *PTy) {
|
|
if (V->isNullValue()) // Is it a FP or Integral null value?
|
|
return ConstantPointerNull::get(PTy);
|
|
return 0; // Can't const prop other types of pointers
|
|
}
|
|
|
|
// Casting operators. ick
|
|
#define DEF_CAST(TYPE, CLASS, CTYPE) \
|
|
static CLASS *CastTo##TYPE (const ConstantClass *V) { \
|
|
return CLASS::get(Type::TYPE##Ty, (CTYPE)(BuiltinType)V->getValue()); \
|
|
}
|
|
|
|
DEF_CAST(Bool , ConstantBool, bool)
|
|
DEF_CAST(SByte , ConstantSInt, signed char)
|
|
DEF_CAST(UByte , ConstantUInt, unsigned char)
|
|
DEF_CAST(Short , ConstantSInt, signed short)
|
|
DEF_CAST(UShort, ConstantUInt, unsigned short)
|
|
DEF_CAST(Int , ConstantSInt, signed int)
|
|
DEF_CAST(UInt , ConstantUInt, unsigned int)
|
|
DEF_CAST(Long , ConstantSInt, int64_t)
|
|
DEF_CAST(ULong , ConstantUInt, uint64_t)
|
|
DEF_CAST(Float , ConstantFP , float)
|
|
DEF_CAST(Double, ConstantFP , double)
|
|
#undef DEF_CAST
|
|
};
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// DirectIntRules Class
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// DirectIntRules provides implementations of functions that are valid on
|
|
// integer types, but not all types in general.
|
|
//
|
|
template <class ConstantClass, class BuiltinType, Type **Ty>
|
|
struct DirectIntRules
|
|
: public DirectRules<ConstantClass, BuiltinType, Ty,
|
|
DirectIntRules<ConstantClass, BuiltinType, Ty> > {
|
|
|
|
static Constant *Div(const ConstantClass *V1, const ConstantClass *V2) {
|
|
if (V2->isNullValue()) return 0;
|
|
if (V2->isAllOnesValue() && // MIN_INT / -1
|
|
(BuiltinType)V1->getValue() == -(BuiltinType)V1->getValue())
|
|
return 0;
|
|
BuiltinType R = (BuiltinType)V1->getValue() / (BuiltinType)V2->getValue();
|
|
return ConstantClass::get(*Ty, R);
|
|
}
|
|
|
|
static Constant *Rem(const ConstantClass *V1,
|
|
const ConstantClass *V2) {
|
|
if (V2->isNullValue()) return 0; // X / 0
|
|
if (V2->isAllOnesValue() && // MIN_INT / -1
|
|
(BuiltinType)V1->getValue() == -(BuiltinType)V1->getValue())
|
|
return 0;
|
|
BuiltinType R = (BuiltinType)V1->getValue() % (BuiltinType)V2->getValue();
|
|
return ConstantClass::get(*Ty, R);
|
|
}
|
|
|
|
static Constant *And(const ConstantClass *V1, const ConstantClass *V2) {
|
|
BuiltinType R = (BuiltinType)V1->getValue() & (BuiltinType)V2->getValue();
|
|
return ConstantClass::get(*Ty, R);
|
|
}
|
|
static Constant *Or(const ConstantClass *V1, const ConstantClass *V2) {
|
|
BuiltinType R = (BuiltinType)V1->getValue() | (BuiltinType)V2->getValue();
|
|
return ConstantClass::get(*Ty, R);
|
|
}
|
|
static Constant *Xor(const ConstantClass *V1, const ConstantClass *V2) {
|
|
BuiltinType R = (BuiltinType)V1->getValue() ^ (BuiltinType)V2->getValue();
|
|
return ConstantClass::get(*Ty, R);
|
|
}
|
|
|
|
static Constant *Shl(const ConstantClass *V1, const ConstantClass *V2) {
|
|
BuiltinType R = (BuiltinType)V1->getValue() << (BuiltinType)V2->getValue();
|
|
return ConstantClass::get(*Ty, R);
|
|
}
|
|
|
|
static Constant *Shr(const ConstantClass *V1, const ConstantClass *V2) {
|
|
BuiltinType R = (BuiltinType)V1->getValue() >> (BuiltinType)V2->getValue();
|
|
return ConstantClass::get(*Ty, R);
|
|
}
|
|
};
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// DirectFPRules Class
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// DirectFPRules provides implementations of functions that are valid on
|
|
// floating point types, but not all types in general.
|
|
//
|
|
template <class ConstantClass, class BuiltinType, Type **Ty>
|
|
struct DirectFPRules
|
|
: public DirectRules<ConstantClass, BuiltinType, Ty,
|
|
DirectFPRules<ConstantClass, BuiltinType, Ty> > {
|
|
static Constant *Rem(const ConstantClass *V1, const ConstantClass *V2) {
|
|
if (V2->isNullValue()) return 0;
|
|
BuiltinType Result = std::fmod((BuiltinType)V1->getValue(),
|
|
(BuiltinType)V2->getValue());
|
|
return ConstantClass::get(*Ty, Result);
|
|
}
|
|
};
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// DirectRules Subclasses
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Given the DirectRules class we can now implement lots of types with little
|
|
// code. Thank goodness C++ compilers are great at stomping out layers of
|
|
// templates... can you imagine having to do this all by hand? (/me is lazy :)
|
|
//
|
|
|
|
// ConstRules::find - Return the constant rules that take care of the specified
|
|
// type.
|
|
//
|
|
Annotation *ConstRules::find(AnnotationID AID, const Annotable *TyA, void *) {
|
|
assert(AID == ConstRules::AID && "Bad annotation for factory!");
|
|
const Type *Ty = cast<Type>((const Value*)TyA);
|
|
|
|
switch (Ty->getPrimitiveID()) {
|
|
case Type::BoolTyID: return new BoolRules();
|
|
case Type::PointerTyID: return new PointerRules();
|
|
case Type::SByteTyID:
|
|
return new DirectIntRules<ConstantSInt, signed char , &Type::SByteTy>();
|
|
case Type::UByteTyID:
|
|
return new DirectIntRules<ConstantUInt, unsigned char , &Type::UByteTy>();
|
|
case Type::ShortTyID:
|
|
return new DirectIntRules<ConstantSInt, signed short, &Type::ShortTy>();
|
|
case Type::UShortTyID:
|
|
return new DirectIntRules<ConstantUInt, unsigned short, &Type::UShortTy>();
|
|
case Type::IntTyID:
|
|
return new DirectIntRules<ConstantSInt, signed int , &Type::IntTy>();
|
|
case Type::UIntTyID:
|
|
return new DirectIntRules<ConstantUInt, unsigned int , &Type::UIntTy>();
|
|
case Type::LongTyID:
|
|
return new DirectIntRules<ConstantSInt, int64_t , &Type::LongTy>();
|
|
case Type::ULongTyID:
|
|
return new DirectIntRules<ConstantUInt, uint64_t , &Type::ULongTy>();
|
|
case Type::FloatTyID:
|
|
return new DirectFPRules<ConstantFP , float , &Type::FloatTy>();
|
|
case Type::DoubleTyID:
|
|
return new DirectFPRules<ConstantFP , double , &Type::DoubleTy>();
|
|
default:
|
|
return new EmptyRules();
|
|
}
|
|
}
|
|
|
|
ConstRules *ConstRules::getConstantExprRules() {
|
|
static EmptyRules CERules;
|
|
return &CERules;
|
|
}
|