#include "llvm/Instructions.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
+#include "llvm/GlobalAlias.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
for (unsigned i = 0; i != SrcNumElts; ++i) {
ConstantInt *CI = cast<ConstantInt>(CV->getOperand(i));
double V = CI->getValue().bitsToDouble();
- Result.push_back(ConstantFP::get(Type::DoubleTy, V));
+ Result.push_back(ConstantFP::get(Type::DoubleTy, APFloat(V)));
}
return ConstantVector::get(Result);
}
for (unsigned i = 0; i != SrcNumElts; ++i) {
ConstantInt *CI = cast<ConstantInt>(CV->getOperand(i));
float V = CI->getValue().bitsToFloat();
- Result.push_back(ConstantFP::get(Type::FloatTy, V));
+ Result.push_back(ConstantFP::get(Type::FloatTy, APFloat(V)));
}
return ConstantVector::get(Result);
}
if (SrcEltTy->getTypeID() == Type::DoubleTyID) {
for (unsigned i = 0; i != SrcNumElts; ++i) {
- uint64_t V =
- DoubleToBits(cast<ConstantFP>(CV->getOperand(i))->getValue());
+ uint64_t V = cast<ConstantFP>(CV->getOperand(i))->
+ getValueAPF().convertToAPInt().getZExtValue();
Constant *C = ConstantInt::get(Type::Int64Ty, V);
Result.push_back(ConstantExpr::getBitCast(C, DstEltTy ));
}
assert(SrcEltTy->getTypeID() == Type::FloatTyID);
for (unsigned i = 0; i != SrcNumElts; ++i) {
- uint32_t V = FloatToBits(cast<ConstantFP>(CV->getOperand(i))->getValue());
+ uint32_t V = (uint32_t)cast<ConstantFP>(CV->getOperand(i))->
+ getValueAPF().convertToAPInt().getZExtValue();
Constant *C = ConstantInt::get(Type::Int32Ty, V);
Result.push_back(ConstantExpr::getBitCast(C, DstEltTy));
}
/// This function determines which opcode to use to fold two constant cast
/// expressions together. It uses CastInst::isEliminableCastPair to determine
/// the opcode. Consequently its just a wrapper around that function.
-/// @Determine if it is valid to fold a cast of a cast
+/// @brief Determine if it is valid to fold a cast of a cast
static unsigned
foldConstantCastPair(
unsigned opc, ///< opcode of the second cast constant expression
const Type *DestTy) {
const Type *SrcTy = V->getType();
- if (isa<UndefValue>(V))
+ if (isa<UndefValue>(V)) {
+ // zext(undef) = 0, because the top bits will be zero.
+ // sext(undef) = 0, because the top bits will all be the same.
+ if (opc == Instruction::ZExt || opc == Instruction::SExt)
+ return Constant::getNullValue(DestTy);
return UndefValue::get(DestTy);
+ }
// If the cast operand is a constant expression, there's a few things we can
// do to try to simplify it.
switch (opc) {
case Instruction::FPTrunc:
case Instruction::FPExt:
- if (const ConstantFP *FPC = dyn_cast<ConstantFP>(V))
- return ConstantFP::get(DestTy, FPC->getValue());
- return 0; // Can't fold.
- case Instruction::FPToUI:
if (const ConstantFP *FPC = dyn_cast<ConstantFP>(V)) {
- uint32_t DestBitWidth = cast<IntegerType>(DestTy)->getBitWidth();
- APInt Val(APIntOps::RoundDoubleToAPInt(FPC->getValue(), DestBitWidth));
- return ConstantInt::get(Val);
+ APFloat Val = FPC->getValueAPF();
+ Val.convert(DestTy == Type::FloatTy ? APFloat::IEEEsingle :
+ DestTy == Type::DoubleTy ? APFloat::IEEEdouble :
+ DestTy == Type::X86_FP80Ty ? APFloat::x87DoubleExtended :
+ DestTy == Type::FP128Ty ? APFloat::IEEEquad :
+ APFloat::Bogus,
+ APFloat::rmNearestTiesToEven);
+ return ConstantFP::get(DestTy, Val);
}
return 0; // Can't fold.
+ case Instruction::FPToUI:
case Instruction::FPToSI:
if (const ConstantFP *FPC = dyn_cast<ConstantFP>(V)) {
+ APFloat V = FPC->getValueAPF();
+ uint64_t x[2];
uint32_t DestBitWidth = cast<IntegerType>(DestTy)->getBitWidth();
- APInt Val(APIntOps::RoundDoubleToAPInt(FPC->getValue(), DestBitWidth));
+ (void) V.convertToInteger(x, DestBitWidth, opc==Instruction::FPToSI,
+ APFloat::rmTowardZero);
+ APInt Val(DestBitWidth, 2, x);
return ConstantInt::get(Val);
}
return 0; // Can't fold.
return ConstantInt::get(DestTy, 0);
return 0; // Other pointer types cannot be casted
case Instruction::UIToFP:
- if (const ConstantInt *CI = dyn_cast<ConstantInt>(V))
- return ConstantFP::get(DestTy, CI->getValue().roundToDouble());
+ if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
+ double d = CI->getValue().roundToDouble();
+ if (DestTy==Type::FloatTy)
+ return ConstantFP::get(DestTy, APFloat((float)d));
+ else if (DestTy==Type::DoubleTy)
+ return ConstantFP::get(DestTy, APFloat(d));
+ else
+ return 0; // FIXME do this for long double
+ }
return 0;
case Instruction::SIToFP:
- if (const ConstantInt *CI = dyn_cast<ConstantInt>(V))
- return ConstantFP::get(DestTy, CI->getValue().signedRoundToDouble());
+ if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
+ double d = CI->getValue().signedRoundToDouble();
+ if (DestTy==Type::FloatTy)
+ return ConstantFP::get(DestTy, APFloat((float)d));
+ else if (DestTy==Type::DoubleTy)
+ return ConstantFP::get(DestTy, APFloat(d));
+ else
+ return 0; // FIXME do this for long double
+ }
return 0;
case Instruction::ZExt:
if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
return const_cast<Constant*>(V);
if (DestTy->isFloatingPoint()) {
- if (DestTy == Type::FloatTy)
- return ConstantFP::get(DestTy, CI->getValue().bitsToFloat());
- assert(DestTy == Type::DoubleTy && "Unknown FP type!");
- return ConstantFP::get(DestTy, CI->getValue().bitsToDouble());
+ assert((DestTy == Type::DoubleTy || DestTy == Type::FloatTy) &&
+ "Unknown FP type!");
+ return ConstantFP::get(DestTy, APFloat(CI->getValue()));
}
// Otherwise, can't fold this (vector?)
return 0;
if (const ConstantFP *FP = dyn_cast<ConstantFP>(V)) {
// FP -> Integral.
if (DestTy == Type::Int32Ty) {
- APInt Val(32, 0);
- return ConstantInt::get(Val.floatToBits(FP->getValue()));
+ return ConstantInt::get(FP->getValueAPF().convertToAPInt());
} else {
assert(DestTy == Type::Int64Ty && "only support f32/f64 for now!");
- APInt Val(64, 0);
- return ConstantInt::get(Val.doubleToBits(FP->getValue()));
+ return ConstantInt::get(FP->getValueAPF().convertToAPInt());
}
}
return 0;
}
} else if (const ConstantFP *CFP1 = dyn_cast<ConstantFP>(C1)) {
if (const ConstantFP *CFP2 = dyn_cast<ConstantFP>(C2)) {
- double C1Val = CFP1->getValue();
- double C2Val = CFP2->getValue();
+ APFloat C1V = CFP1->getValueAPF();
+ APFloat C2V = CFP2->getValueAPF();
+ APFloat C3V = C1V; // copy for modification
+ bool isDouble = CFP1->getType()==Type::DoubleTy;
switch (Opcode) {
default:
break;
- case Instruction::Add:
- return ConstantFP::get(CFP1->getType(), C1Val + C2Val);
+ case Instruction::Add:
+ (void)C3V.add(C2V, APFloat::rmNearestTiesToEven);
+ return ConstantFP::get(CFP1->getType(), C3V);
case Instruction::Sub:
- return ConstantFP::get(CFP1->getType(), C1Val - C2Val);
- case Instruction::Mul:
- return ConstantFP::get(CFP1->getType(), C1Val * C2Val);
+ (void)C3V.subtract(C2V, APFloat::rmNearestTiesToEven);
+ return ConstantFP::get(CFP1->getType(), C3V);
+ case Instruction::Mul:
+ (void)C3V.multiply(C2V, APFloat::rmNearestTiesToEven);
+ return ConstantFP::get(CFP1->getType(), C3V);
case Instruction::FDiv:
- if (CFP2->isExactlyValue(0.0) || CFP2->isExactlyValue(-0.0))
- if (CFP1->isExactlyValue(0.0) || CFP1->isExactlyValue(-0.0))
- // IEEE 754, Section 7.1, #4
- return ConstantFP::get(CFP1->getType(),
- std::numeric_limits<double>::quiet_NaN());
- else if (CFP2->isExactlyValue(-0.0) || C1Val < 0.0)
- // IEEE 754, Section 7.2, negative infinity case
- return ConstantFP::get(CFP1->getType(),
- -std::numeric_limits<double>::infinity());
- else
- // IEEE 754, Section 7.2, positive infinity case
- return ConstantFP::get(CFP1->getType(),
- std::numeric_limits<double>::infinity());
- return ConstantFP::get(CFP1->getType(), C1Val / C2Val);
+ (void)C3V.divide(C2V, APFloat::rmNearestTiesToEven);
+ return ConstantFP::get(CFP1->getType(), C3V);
case Instruction::FRem:
- if (CFP2->isExactlyValue(0.0) || CFP2->isExactlyValue(-0.0))
+ if (C2V.isZero())
// IEEE 754, Section 7.1, #5
- return ConstantFP::get(CFP1->getType(),
- std::numeric_limits<double>::quiet_NaN());
- return ConstantFP::get(CFP1->getType(), std::fmod(C1Val, C2Val));
-
+ return ConstantFP::get(CFP1->getType(), isDouble ?
+ APFloat(std::numeric_limits<double>::quiet_NaN()) :
+ APFloat(std::numeric_limits<float>::quiet_NaN()));
+ (void)C3V.mod(C2V, APFloat::rmNearestTiesToEven);
+ return ConstantFP::get(CFP1->getType(), C3V);
}
}
} else if (const ConstantVector *CP1 = dyn_cast<ConstantVector>(C1)) {
// Now we know that the RHS is a GlobalValue or simple constant,
// which (since the types must match) means that it's a ConstantPointerNull.
if (const GlobalValue *CPR2 = dyn_cast<GlobalValue>(V2)) {
- if (!CPR1->hasExternalWeakLinkage() || !CPR2->hasExternalWeakLinkage())
- return ICmpInst::ICMP_NE;
+ // Don't try to decide equality of aliases.
+ if (!isa<GlobalAlias>(CPR1) && !isa<GlobalAlias>(CPR2))
+ if (!CPR1->hasExternalWeakLinkage() || !CPR2->hasExternalWeakLinkage())
+ return ICmpInst::ICMP_NE;
} else {
- // GlobalVals can never be null.
assert(isa<ConstantPointerNull>(V2) && "Canonicalization guarantee!");
- if (!CPR1->hasExternalWeakLinkage())
+ // GlobalVals can never be null. Don't try to evaluate aliases.
+ if (!CPR1->hasExternalWeakLinkage() && !isa<GlobalAlias>(CPR1))
return ICmpInst::ICMP_NE;
}
} else {
// icmp eq/ne(null,GV) -> false/true
if (C1->isNullValue()) {
if (const GlobalValue *GV = dyn_cast<GlobalValue>(C2))
- if (!GV->hasExternalWeakLinkage()) // External weak GV can be null
+ // Don't try to evaluate aliases. External weak GV can be null.
+ if (!isa<GlobalAlias>(GV) && !GV->hasExternalWeakLinkage())
if (pred == ICmpInst::ICMP_EQ)
return ConstantInt::getFalse();
else if (pred == ICmpInst::ICMP_NE)
// icmp eq/ne(GV,null) -> false/true
} else if (C2->isNullValue()) {
if (const GlobalValue *GV = dyn_cast<GlobalValue>(C1))
- if (!GV->hasExternalWeakLinkage()) // External weak GV can be null
+ // Don't try to evaluate aliases. External weak GV can be null.
+ if (!isa<GlobalAlias>(GV) && !GV->hasExternalWeakLinkage())
if (pred == ICmpInst::ICMP_EQ)
return ConstantInt::getFalse();
else if (pred == ICmpInst::ICMP_NE)
case ICmpInst::ICMP_UGE:return ConstantInt::get(Type::Int1Ty, V1.uge(V2));
}
} else if (isa<ConstantFP>(C1) && isa<ConstantFP>(C2)) {
- double C1Val = cast<ConstantFP>(C1)->getValue();
- double C2Val = cast<ConstantFP>(C2)->getValue();
+ APFloat C1V = cast<ConstantFP>(C1)->getValueAPF();
+ APFloat C2V = cast<ConstantFP>(C2)->getValueAPF();
+ APFloat::cmpResult R = C1V.compare(C2V);
switch (pred) {
default: assert(0 && "Invalid FCmp Predicate"); return 0;
case FCmpInst::FCMP_FALSE: return ConstantInt::getFalse();
case FCmpInst::FCMP_TRUE: return ConstantInt::getTrue();
case FCmpInst::FCMP_UNO:
- return ConstantInt::get(Type::Int1Ty, C1Val != C1Val || C2Val != C2Val);
+ return ConstantInt::get(Type::Int1Ty, R==APFloat::cmpUnordered);
case FCmpInst::FCMP_ORD:
- return ConstantInt::get(Type::Int1Ty, C1Val == C1Val && C2Val == C2Val);
+ return ConstantInt::get(Type::Int1Ty, R!=APFloat::cmpUnordered);
case FCmpInst::FCMP_UEQ:
- if (C1Val != C1Val || C2Val != C2Val)
- return ConstantInt::getTrue();
- /* FALL THROUGH */
+ return ConstantInt::get(Type::Int1Ty, R==APFloat::cmpUnordered ||
+ R==APFloat::cmpEqual);
case FCmpInst::FCMP_OEQ:
- return ConstantInt::get(Type::Int1Ty, C1Val == C2Val);
+ return ConstantInt::get(Type::Int1Ty, R==APFloat::cmpEqual);
case FCmpInst::FCMP_UNE:
- if (C1Val != C1Val || C2Val != C2Val)
- return ConstantInt::getTrue();
- /* FALL THROUGH */
+ return ConstantInt::get(Type::Int1Ty, R!=APFloat::cmpEqual);
case FCmpInst::FCMP_ONE:
- return ConstantInt::get(Type::Int1Ty, C1Val != C2Val);
+ return ConstantInt::get(Type::Int1Ty, R==APFloat::cmpLessThan ||
+ R==APFloat::cmpGreaterThan);
case FCmpInst::FCMP_ULT:
- if (C1Val != C1Val || C2Val != C2Val)
- return ConstantInt::getTrue();
- /* FALL THROUGH */
+ return ConstantInt::get(Type::Int1Ty, R==APFloat::cmpUnordered ||
+ R==APFloat::cmpLessThan);
case FCmpInst::FCMP_OLT:
- return ConstantInt::get(Type::Int1Ty, C1Val < C2Val);
+ return ConstantInt::get(Type::Int1Ty, R==APFloat::cmpLessThan);
case FCmpInst::FCMP_UGT:
- if (C1Val != C1Val || C2Val != C2Val)
- return ConstantInt::getTrue();
- /* FALL THROUGH */
+ return ConstantInt::get(Type::Int1Ty, R==APFloat::cmpUnordered ||
+ R==APFloat::cmpGreaterThan);
case FCmpInst::FCMP_OGT:
- return ConstantInt::get(Type::Int1Ty, C1Val > C2Val);
+ return ConstantInt::get(Type::Int1Ty, R==APFloat::cmpGreaterThan);
case FCmpInst::FCMP_ULE:
- if (C1Val != C1Val || C2Val != C2Val)
- return ConstantInt::getTrue();
- /* FALL THROUGH */
+ return ConstantInt::get(Type::Int1Ty, R!=APFloat::cmpGreaterThan);
case FCmpInst::FCMP_OLE:
- return ConstantInt::get(Type::Int1Ty, C1Val <= C2Val);
+ return ConstantInt::get(Type::Int1Ty, R==APFloat::cmpLessThan ||
+ R==APFloat::cmpEqual);
case FCmpInst::FCMP_UGE:
- if (C1Val != C1Val || C2Val != C2Val)
- return ConstantInt::getTrue();
- /* FALL THROUGH */
+ return ConstantInt::get(Type::Int1Ty, R!=APFloat::cmpLessThan);
case FCmpInst::FCMP_OGE:
- return ConstantInt::get(Type::Int1Ty, C1Val >= C2Val);
+ return ConstantInt::get(Type::Int1Ty, R==APFloat::cmpGreaterThan ||
+ R==APFloat::cmpEqual);
}
} else if (const ConstantVector *CP1 = dyn_cast<ConstantVector>(C1)) {
if (const ConstantVector *CP2 = dyn_cast<ConstantVector>(C2)) {
}
Constant *llvm::ConstantFoldGetElementPtr(const Constant *C,
- Constant* const *Idxs,
+ Constant* const *Idxs,
unsigned NumIdx) {
if (NumIdx == 0 ||
(NumIdx == 1 && Idxs[0]->isNullValue()))
if (isa<UndefValue>(C)) {
const Type *Ty = GetElementPtrInst::getIndexedType(C->getType(),
- (Value**)Idxs, NumIdx,
+ (Value **)Idxs,
+ (Value **)Idxs+NumIdx,
true);
assert(Ty != 0 && "Invalid indices for GEP!");
return UndefValue::get(PointerType::get(Ty));
}
if (isNull) {
const Type *Ty = GetElementPtrInst::getIndexedType(C->getType(),
- (Value**)Idxs, NumIdx,
+ (Value**)Idxs,
+ (Value**)Idxs+NumIdx,
true);
assert(Ty != 0 && "Invalid indices for GEP!");
return ConstantPointerNull::get(PointerType::get(Ty));
// long 0, long 0)
// To: int* getelementptr ([3 x int]* %X, long 0, long 0)
//
- if (CE->isCast() && NumIdx > 1 && Idx0->isNullValue())
+ if (CE->isCast() && NumIdx > 1 && Idx0->isNullValue()) {
if (const PointerType *SPT =
dyn_cast<PointerType>(CE->getOperand(0)->getType()))
if (const ArrayType *SAT = dyn_cast<ArrayType>(SPT->getElementType()))
if (CAT->getElementType() == SAT->getElementType())
return ConstantExpr::getGetElementPtr(
(Constant*)CE->getOperand(0), Idxs, NumIdx);
+ }
+
+ // Fold: getelementptr (i8* inttoptr (i64 1 to i8*), i32 -1)
+ // Into: inttoptr (i64 0 to i8*)
+ // This happens with pointers to member functions in C++.
+ if (CE->getOpcode() == Instruction::IntToPtr && NumIdx == 1 &&
+ isa<ConstantInt>(CE->getOperand(0)) && isa<ConstantInt>(Idxs[0]) &&
+ cast<PointerType>(CE->getType())->getElementType() == Type::Int8Ty) {
+ Constant *Base = CE->getOperand(0);
+ Constant *Offset = Idxs[0];
+
+ // Convert the smaller integer to the larger type.
+ if (Offset->getType()->getPrimitiveSizeInBits() <
+ Base->getType()->getPrimitiveSizeInBits())
+ Offset = ConstantExpr::getSExt(Offset, Base->getType());
+ else if (Base->getType()->getPrimitiveSizeInBits() <
+ Offset->getType()->getPrimitiveSizeInBits())
+ Base = ConstantExpr::getZExt(Base, Base->getType());
+
+ Base = ConstantExpr::getAdd(Base, Offset);
+ return ConstantExpr::getIntToPtr(Base, CE->getType());
+ }
}
return 0;
}
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