// ConstantExpr::get* methods to automatically fold constants when possible.
//
// The current constant folding implementation is implemented in two pieces: the
-// pieces that don't need TargetData, and the pieces that do. This is to avoid
+// pieces that don't need DataLayout, and the pieces that do. This is to avoid
// a dependence in VMCore on Target.
//
//===----------------------------------------------------------------------===//
#include "ConstantFold.h"
+#include "llvm/ADT/SmallVector.h"
#include "llvm/Constants.h"
-#include "llvm/Instructions.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/GlobalAlias.h"
#include "llvm/GlobalVariable.h"
+#include "llvm/Instructions.h"
#include "llvm/Operator.h"
-#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
Type *DstEltTy = DstTy->getElementType();
- // Check to verify that all elements of the input are simple.
SmallVector<Constant*, 16> Result;
+ Type *Ty = IntegerType::get(CV->getContext(), 32);
for (unsigned i = 0; i != NumElts; ++i) {
- Constant *C = CV->getAggregateElement(i);
- if (C == 0) return 0;
+ Constant *C =
+ ConstantExpr::getExtractElement(CV, ConstantInt::get(Ty, i));
C = ConstantExpr::getBitCast(C, DstEltTy);
- if (isa<ConstantExpr>(C)) return 0;
Result.push_back(C);
}
Instruction::CastOps firstOp = Instruction::CastOps(Op->getOpcode());
Instruction::CastOps secondOp = Instruction::CastOps(opc);
+ // Assume that pointers are never more than 64 bits wide.
+ IntegerType *FakeIntPtrTy = Type::getInt64Ty(DstTy->getContext());
+
// Let CastInst::isEliminableCastPair do the heavy lifting.
return CastInst::isEliminableCastPair(firstOp, secondOp, SrcTy, MidTy, DstTy,
- Type::getInt64Ty(DstTy->getContext()));
+ FakeIntPtrTy, FakeIntPtrTy,
+ FakeIntPtrTy);
}
static Constant *FoldBitCast(Constant *V, Type *DestTy) {
return UndefValue::get(DestTy);
}
- // No compile-time operations on this type yet.
- if (V->getType()->isPPC_FP128Ty() || DestTy->isPPC_FP128Ty())
- return 0;
-
if (V->isNullValue() && !DestTy->isX86_MMXTy())
return Constant::getNullValue(DestTy);
// If the cast operand is a constant vector, perform the cast by
// operating on each element. In the cast of bitcasts, the element
// count may be mismatched; don't attempt to handle that here.
- if (ConstantVector *CV = dyn_cast<ConstantVector>(V))
- if (DestTy->isVectorTy() &&
- cast<VectorType>(DestTy)->getNumElements() ==
- CV->getType()->getNumElements()) {
- std::vector<Constant*> res;
- VectorType *DestVecTy = cast<VectorType>(DestTy);
- Type *DstEltTy = DestVecTy->getElementType();
- for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
- res.push_back(ConstantExpr::getCast(opc,
- CV->getOperand(i), DstEltTy));
- return ConstantVector::get(res);
+ if ((isa<ConstantVector>(V) || isa<ConstantDataVector>(V)) &&
+ DestTy->isVectorTy() &&
+ DestTy->getVectorNumElements() == V->getType()->getVectorNumElements()) {
+ SmallVector<Constant*, 16> res;
+ VectorType *DestVecTy = cast<VectorType>(DestTy);
+ Type *DstEltTy = DestVecTy->getElementType();
+ Type *Ty = IntegerType::get(V->getContext(), 32);
+ for (unsigned i = 0, e = V->getType()->getVectorNumElements(); i != e; ++i) {
+ Constant *C =
+ ConstantExpr::getExtractElement(V, ConstantInt::get(Ty, i));
+ res.push_back(ConstantExpr::getCast(opc, C, DstEltTy));
}
+ return ConstantVector::get(res);
+ }
// We actually have to do a cast now. Perform the cast according to the
// opcode specified.
DestTy->isDoubleTy() ? APFloat::IEEEdouble :
DestTy->isX86_FP80Ty() ? APFloat::x87DoubleExtended :
DestTy->isFP128Ty() ? APFloat::IEEEquad :
+ DestTy->isPPC_FP128Ty() ? APFloat::PPCDoubleDouble :
APFloat::Bogus,
APFloat::rmNearestTiesToEven, &ignored);
return ConstantFP::get(V->getContext(), Val);
case Instruction::SIToFP:
if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
APInt api = CI->getValue();
- APFloat apf(APInt::getNullValue(DestTy->getPrimitiveSizeInBits()), true);
+ APFloat apf(APInt::getNullValue(DestTy->getPrimitiveSizeInBits()),
+ !DestTy->isPPC_FP128Ty() /* isEEEE */);
(void)apf.convertFromAPInt(api,
opc==Instruction::SIToFP,
APFloat::rmNearestTiesToEven);
if (Cond->isNullValue()) return V2;
if (Cond->isAllOnesValue()) return V1;
- // FIXME: CDV Condition.
// If the condition is a vector constant, fold the result elementwise.
if (ConstantVector *CondV = dyn_cast<ConstantVector>(Cond)) {
SmallVector<Constant*, 16> Result;
+ Type *Ty = IntegerType::get(CondV->getContext(), 32);
for (unsigned i = 0, e = V1->getType()->getVectorNumElements(); i != e;++i){
ConstantInt *Cond = dyn_cast<ConstantInt>(CondV->getOperand(i));
if (Cond == 0) break;
- Constant *Res = (Cond->getZExtValue() ? V2 : V1)->getAggregateElement(i);
- if (Res == 0) break;
+ Constant *V = Cond->isNullValue() ? V2 : V1;
+ Constant *Res = ConstantExpr::getExtractElement(V, ConstantInt::get(Ty, i));
Result.push_back(Res);
}
return ConstantVector::get(Result);
}
-
if (isa<UndefValue>(Cond)) {
if (isa<UndefValue>(V1)) return V1;
return V2;
if (ConstantExpr *TrueVal = dyn_cast<ConstantExpr>(V1)) {
if (TrueVal->getOpcode() == Instruction::Select)
if (TrueVal->getOperand(0) == Cond)
- return ConstantExpr::getSelect(Cond, TrueVal->getOperand(1), V2);
+ return ConstantExpr::getSelect(Cond, TrueVal->getOperand(1), V2);
}
if (ConstantExpr *FalseVal = dyn_cast<ConstantExpr>(V2)) {
if (FalseVal->getOpcode() == Instruction::Select)
if (FalseVal->getOperand(0) == Cond)
- return ConstantExpr::getSelect(Cond, V1, FalseVal->getOperand(2));
+ return ConstantExpr::getSelect(Cond, V1, FalseVal->getOperand(2));
}
return 0;
Constant *llvm::ConstantFoldExtractElementInstruction(Constant *Val,
Constant *Idx) {
if (isa<UndefValue>(Val)) // ee(undef, x) -> undef
- return UndefValue::get(cast<VectorType>(Val->getType())->getElementType());
+ return UndefValue::get(Val->getType()->getVectorElementType());
if (Val->isNullValue()) // ee(zero, x) -> zero
- return Constant::getNullValue(
- cast<VectorType>(Val->getType())->getElementType());
-
- if (ConstantVector *CVal = dyn_cast<ConstantVector>(Val)) {
- if (ConstantInt *CIdx = dyn_cast<ConstantInt>(Idx)) {
- uint64_t Index = CIdx->getZExtValue();
- if (Index >= CVal->getNumOperands())
- // ee({w,x,y,z}, wrong_value) -> undef
- return UndefValue::get(cast<VectorType>(Val->getType())->getElementType());
- return CVal->getOperand(CIdx->getZExtValue());
- } else if (isa<UndefValue>(Idx)) {
- // ee({w,x,y,z}, undef) -> undef
- return UndefValue::get(cast<VectorType>(Val->getType())->getElementType());
- }
+ return Constant::getNullValue(Val->getType()->getVectorElementType());
+ // ee({w,x,y,z}, undef) -> undef
+ if (isa<UndefValue>(Idx))
+ return UndefValue::get(Val->getType()->getVectorElementType());
+
+ if (ConstantInt *CIdx = dyn_cast<ConstantInt>(Idx)) {
+ uint64_t Index = CIdx->getZExtValue();
+ // ee({w,x,y,z}, wrong_value) -> undef
+ if (Index >= Val->getType()->getVectorNumElements())
+ return UndefValue::get(Val->getType()->getVectorElementType());
+ return Val->getAggregateElement(Index);
}
return 0;
}
const APInt &IdxVal = CIdx->getValue();
SmallVector<Constant*, 16> Result;
+ Type *Ty = IntegerType::get(Val->getContext(), 32);
for (unsigned i = 0, e = Val->getType()->getVectorNumElements(); i != e; ++i){
if (i == IdxVal) {
Result.push_back(Elt);
continue;
}
- if (Constant *C = Val->getAggregateElement(i))
- Result.push_back(C);
- else
- return 0;
+ Constant *C =
+ ConstantExpr::getExtractElement(Val, ConstantInt::get(Ty, i));
+ Result.push_back(C);
}
return ConstantVector::get(Result);
Constant *llvm::ConstantFoldShuffleVectorInstruction(Constant *V1,
Constant *V2,
Constant *Mask) {
+ unsigned MaskNumElts = Mask->getType()->getVectorNumElements();
+ Type *EltTy = V1->getType()->getVectorElementType();
+
// Undefined shuffle mask -> undefined value.
- if (isa<UndefValue>(Mask)) return UndefValue::get(V1->getType());
+ if (isa<UndefValue>(Mask))
+ return UndefValue::get(VectorType::get(EltTy, MaskNumElts));
- unsigned MaskNumElts = cast<VectorType>(Mask->getType())->getNumElements();
- unsigned SrcNumElts = cast<VectorType>(V1->getType())->getNumElements();
- Type *EltTy = cast<VectorType>(V1->getType())->getElementType();
+ // Don't break the bitcode reader hack.
+ if (isa<ConstantExpr>(Mask)) return 0;
+
+ unsigned SrcNumElts = V1->getType()->getVectorNumElements();
// Loop over the shuffle mask, evaluating each element.
SmallVector<Constant*, 32> Result;
for (unsigned i = 0; i != MaskNumElts; ++i) {
- Constant *InElt = Mask->getAggregateElement(i);
- if (InElt == 0) return 0;
-
- if (isa<UndefValue>(InElt)) {
+ int Elt = ShuffleVectorInst::getMaskValue(Mask, i);
+ if (Elt == -1) {
Result.push_back(UndefValue::get(EltTy));
continue;
}
- unsigned Elt = cast<ConstantInt>(InElt)->getZExtValue();
- if (Elt >= SrcNumElts*2)
+ Constant *InElt;
+ if (unsigned(Elt) >= SrcNumElts*2)
InElt = UndefValue::get(EltTy);
- else if (Elt >= SrcNumElts)
- InElt = V2->getAggregateElement(Elt - SrcNumElts);
- else
- InElt = V1->getAggregateElement(Elt);
- if (InElt == 0) return 0;
+ else if (unsigned(Elt) >= SrcNumElts) {
+ Type *Ty = IntegerType::get(V2->getContext(), 32);
+ InElt =
+ ConstantExpr::getExtractElement(V2,
+ ConstantInt::get(Ty, Elt - SrcNumElts));
+ } else {
+ Type *Ty = IntegerType::get(V1->getContext(), 32);
+ InElt = ConstantExpr::getExtractElement(V1, ConstantInt::get(Ty, Elt));
+ }
Result.push_back(InElt);
}
Constant *llvm::ConstantFoldBinaryInstruction(unsigned Opcode,
Constant *C1, Constant *C2) {
- // No compile-time operations on this type yet.
- if (C1->getType()->isPPC_FP128Ty())
- return 0;
-
// Handle UndefValue up front.
if (isa<UndefValue>(C1) || isa<UndefValue>(C2)) {
switch (Opcode) {
} else if (VectorType *VTy = dyn_cast<VectorType>(C1->getType())) {
// Perform elementwise folding.
SmallVector<Constant*, 16> Result;
+ Type *Ty = IntegerType::get(VTy->getContext(), 32);
for (unsigned i = 0, e = VTy->getNumElements(); i != e; ++i) {
- Constant *LHS = C1->getAggregateElement(i);
- Constant *RHS = C2->getAggregateElement(i);
- if (LHS == 0 || RHS == 0) break;
+ Constant *LHS =
+ ConstantExpr::getExtractElement(C1, ConstantInt::get(Ty, i));
+ Constant *RHS =
+ ConstantExpr::getExtractElement(C2, ConstantInt::get(Ty, i));
Result.push_back(ConstantExpr::get(Opcode, LHS, RHS));
}
- if (Result.size() == VTy->getNumElements())
- return ConstantVector::get(Result);
+ return ConstantVector::get(Result);
}
if (ConstantExpr *CE1 = dyn_cast<ConstantExpr>(C1)) {
assert(V1->getType() == V2->getType() &&
"Cannot compare values of different types!");
- // No compile-time operations on this type yet.
- if (V1->getType()->isPPC_FP128Ty())
- return FCmpInst::BAD_FCMP_PREDICATE;
-
// Handle degenerate case quickly
if (V1 == V2) return FCmpInst::FCMP_OEQ;
return ConstantInt::get(ResultTy, CmpInst::isTrueWhenEqual(pred));
}
- // No compile-time operations on this type yet.
- if (C1->getType()->isPPC_FP128Ty())
- return 0;
-
// icmp eq/ne(null,GV) -> false/true
if (C1->isNullValue()) {
if (const GlobalValue *GV = dyn_cast<GlobalValue>(C2))
R==APFloat::cmpEqual);
}
} else if (C1->getType()->isVectorTy()) {
- SmallVector<Constant*, 16> C1Elts, C2Elts;
- C1->getVectorElements(C1Elts);
- C2->getVectorElements(C2Elts);
- if (C1Elts.empty() || C2Elts.empty())
- return 0;
-
// If we can constant fold the comparison of each element, constant fold
// the whole vector comparison.
SmallVector<Constant*, 4> ResElts;
+ Type *Ty = IntegerType::get(C1->getContext(), 32);
// Compare the elements, producing an i1 result or constant expr.
- for (unsigned i = 0, e = C1Elts.size(); i != e; ++i)
- ResElts.push_back(ConstantExpr::getCompare(pred, C1Elts[i], C2Elts[i]));
-
+ for (unsigned i = 0, e = C1->getType()->getVectorNumElements(); i != e;++i){
+ Constant *C1E =
+ ConstantExpr::getExtractElement(C1, ConstantInt::get(Ty, i));
+ Constant *C2E =
+ ConstantExpr::getExtractElement(C2, ConstantInt::get(Ty, i));
+
+ ResElts.push_back(ConstantExpr::getCompare(pred, C1E, C2E));
+ }
+
return ConstantVector::get(ResElts);
}
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