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reapply r148901 with a crucial fix.

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"Introduce a new ConstantVector::getSplat constructor function to 
simplify a really common case."


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148924 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2012-01-25 05:19:54 +00:00
parent bce73e0a8c
commit 3c2c954e0b
2 changed files with 68 additions and 31 deletions
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9
include/llvm/Constants.h
View File

@ -489,6 +489,10 @@ public:
// ConstantVector accessors
static Constant *get(ArrayRef<Constant*> V);
/// getSplat - Return a ConstantVector with the specified constant in each
/// element.
static Constant *getSplat(unsigned NumElts, Constant *Elt);
/// Transparently provide more efficient getOperand methods.
DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
@ -757,6 +761,11 @@ public:
static Constant *get(LLVMContext &Context, ArrayRef<float> Elts);
static Constant *get(LLVMContext &Context, ArrayRef<double> Elts);
/// getSplat - Return a ConstantVector with the specified constant in each
/// element. The specified constant has to be a of a compatible type (i8/i16/
/// i32/i64/float/double) and must be a ConstantFP or ConstantInt.
static Constant *getSplat(unsigned NumElts, Constant *Elt);
/// getType - Specialize the getType() method to always return a VectorType,
/// which reduces the amount of casting needed in parts of the compiler.
///

90
lib/VMCore/Constants.cpp
View File

@ -129,7 +129,7 @@ Constant *Constant::getIntegerValue(Type *Ty, const APInt &V) {
// Broadcast a scalar to a vector, if necessary.
if (VectorType *VTy = dyn_cast<VectorType>(Ty))
C = ConstantVector::get(std::vector<Constant *>(VTy->getNumElements(), C));
C = ConstantVector::getSplat(VTy->getNumElements(), C);
return C;
}
@ -145,11 +145,9 @@ Constant *Constant::getAllOnesValue(Type *Ty) {
return ConstantFP::get(Ty->getContext(), FL);
}
SmallVector<Constant*, 16> Elts;
VectorType *VTy = cast<VectorType>(Ty);
Elts.resize(VTy->getNumElements(), getAllOnesValue(VTy->getElementType()));
assert(Elts[0] && "Invalid AllOnes value!");
return cast<ConstantVector>(ConstantVector::get(Elts));
return ConstantVector::getSplat(VTy->getNumElements(),
getAllOnesValue(VTy->getElementType()));
}
void Constant::destroyConstantImpl() {
@ -394,9 +392,8 @@ Constant *ConstantInt::getTrue(Type *Ty) {
}
assert(VTy->getElementType()->isIntegerTy(1) &&
"True must be vector of i1 or i1.");
SmallVector<Constant*, 16> Splat(VTy->getNumElements(),
ConstantInt::getTrue(Ty->getContext()));
return ConstantVector::get(Splat);
return ConstantVector::getSplat(VTy->getNumElements(),
ConstantInt::getTrue(Ty->getContext()));
}
Constant *ConstantInt::getFalse(Type *Ty) {
@ -407,9 +404,8 @@ Constant *ConstantInt::getFalse(Type *Ty) {
}
assert(VTy->getElementType()->isIntegerTy(1) &&
"False must be vector of i1 or i1.");
SmallVector<Constant*, 16> Splat(VTy->getNumElements(),
ConstantInt::getFalse(Ty->getContext()));
return ConstantVector::get(Splat);
return ConstantVector::getSplat(VTy->getNumElements(),
ConstantInt::getFalse(Ty->getContext()));
}
@ -433,8 +429,7 @@ Constant *ConstantInt::get(Type *Ty, uint64_t V, bool isSigned) {
// For vectors, broadcast the value.
if (VectorType *VTy = dyn_cast<VectorType>(Ty))
return ConstantVector::get(SmallVector<Constant*,
16>(VTy->getNumElements(), C));
return ConstantVector::getSplat(VTy->getNumElements(), C);
return C;
}
@ -459,8 +454,7 @@ Constant *ConstantInt::get(Type* Ty, const APInt& V) {
// For vectors, broadcast the value.
if (VectorType *VTy = dyn_cast<VectorType>(Ty))
return ConstantVector::get(
SmallVector<Constant *, 16>(VTy->getNumElements(), C));
return ConstantVector::getSplat(VTy->getNumElements(), C);
return C;
}
@ -506,8 +500,7 @@ Constant *ConstantFP::get(Type* Ty, double V) {
// For vectors, broadcast the value.
if (VectorType *VTy = dyn_cast<VectorType>(Ty))
return ConstantVector::get(
SmallVector<Constant *, 16>(VTy->getNumElements(), C));
return ConstantVector::getSplat(VTy->getNumElements(), C);
return C;
}
@ -521,31 +514,28 @@ Constant *ConstantFP::get(Type* Ty, StringRef Str) {
// For vectors, broadcast the value.
if (VectorType *VTy = dyn_cast<VectorType>(Ty))
return ConstantVector::get(
SmallVector<Constant *, 16>(VTy->getNumElements(), C));
return ConstantVector::getSplat(VTy->getNumElements(), C);
return C;
}
ConstantFP* ConstantFP::getNegativeZero(Type* Ty) {
ConstantFP *ConstantFP::getNegativeZero(Type *Ty) {
LLVMContext &Context = Ty->getContext();
APFloat apf = cast <ConstantFP>(Constant::getNullValue(Ty))->getValueAPF();
APFloat apf = cast<ConstantFP>(Constant::getNullValue(Ty))->getValueAPF();
apf.changeSign();
return get(Context, apf);
}
Constant *ConstantFP::getZeroValueForNegation(Type* Ty) {
if (VectorType *PTy = dyn_cast<VectorType>(Ty))
if (PTy->getElementType()->isFloatingPointTy()) {
SmallVector<Constant*, 16> zeros(PTy->getNumElements(),
getNegativeZero(PTy->getElementType()));
return ConstantVector::get(zeros);
}
if (Ty->isFloatingPointTy())
return getNegativeZero(Ty);
Constant *ConstantFP::getZeroValueForNegation(Type *Ty) {
Type *ScalarTy = Ty->getScalarType();
if (ScalarTy->isFloatingPointTy()) {
Constant *C = getNegativeZero(ScalarTy);
if (VectorType *VTy = dyn_cast<VectorType>(Ty))
return ConstantVector::getSplat(VTy->getNumElements(), C);
return C;
}
return Constant::getNullValue(Ty);
}
@ -818,6 +808,12 @@ Constant *ConstantVector::get(ArrayRef<Constant*> V) {
return pImpl->VectorConstants.getOrCreate(T, V);
}
Constant *ConstantVector::getSplat(unsigned NumElts, Constant *V) {
SmallVector<Constant*, 32> Elts(NumElts, V);
return get(Elts);
}
// Utility function for determining if a ConstantExpr is a CastOp or not. This
// can't be inline because we don't want to #include Instruction.h into
// Constant.h
@ -2196,6 +2192,38 @@ Constant *ConstantDataVector::get(LLVMContext &Context, ArrayRef<double> Elts) {
return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
}
Constant *ConstantDataVector::getSplat(unsigned NumElts, Constant *V) {
assert(isElementTypeCompatible(V->getType()) &&
"Element type not compatible with ConstantData");
if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
if (CI->getType()->isIntegerTy(8)) {
SmallVector<uint8_t, 16> Elts(NumElts, CI->getZExtValue());
return get(V->getContext(), Elts);
}
if (CI->getType()->isIntegerTy(16)) {
SmallVector<uint16_t, 16> Elts(NumElts, CI->getZExtValue());
return get(V->getContext(), Elts);
}
if (CI->getType()->isIntegerTy(32)) {
SmallVector<uint32_t, 16> Elts(NumElts, CI->getZExtValue());
return get(V->getContext(), Elts);
}
assert(CI->getType()->isIntegerTy(64) && "Unsupported ConstantData type");
SmallVector<uint64_t, 16> Elts(NumElts, CI->getZExtValue());
return get(V->getContext(), Elts);
}
ConstantFP *CFP = cast<ConstantFP>(V);
if (CFP->getType()->isFloatTy()) {
SmallVector<float, 16> Elts(NumElts, CFP->getValueAPF().convertToFloat());
return get(V->getContext(), Elts);
}
assert(CFP->getType()->isDoubleTy() && "Unsupported ConstantData type");
SmallVector<double, 16> Elts(NumElts, CFP->getValueAPF().convertToDouble());
return get(V->getContext(), Elts);
}
/// getElementAsInteger - If this is a sequential container of integers (of
/// any size), return the specified element in the low bits of a uint64_t.
uint64_t ConstantDataSequential::getElementAsInteger(unsigned Elt) const {