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Front-end: propagate specialization-constness through conversions and swizzles.

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This commit is contained in:
John Kessenich 2016-03-20 18:45:23 -06:00
parent a5845766e0
commit 6d2b07dc39
3 changed files with 15 additions and 2 deletions
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1
glslang/Include/Types.h
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@ -740,6 +740,7 @@ public:
}
void makeSpecConstant()
{
storage = EvqConst;
specConstant = true;
}
static const char* getLayoutPackingString(TLayoutPacking packing)

10
glslang/MachineIndependent/Intermediate.cpp
View File

@ -262,6 +262,7 @@ TIntermTyped* TIntermediate::addUnaryMath(TOperator op, TIntermTyped* child, TSo
//
// For constructors, we are now done, it was all in the conversion.
// TODO: but, did this bypass constant folding?
//
switch (op) {
case EOpConstructInt:
@ -291,7 +292,7 @@ TIntermTyped* TIntermediate::addUnaryMath(TOperator op, TIntermTyped* child, TSo
if (child->getAsConstantUnion())
return child->getAsConstantUnion()->fold(op, node->getType());
// If it's a specialiation constant, the result is too.
// If it's a specialization constant, the result is too.
if (child->getType().getQualifier().isSpecConstant())
node->getWritableType().getQualifier().makeSpecConstant();
@ -616,6 +617,12 @@ TIntermTyped* TIntermediate::addConversion(TOperator op, const TType& type, TInt
newNode->setLoc(node->getLoc());
newNode->setOperand(node);
// TODO: it seems that some unary folding operations should occur here, but are not
// Propagate specialization-constant-ness.
if (node->getType().getQualifier().isSpecConstant())
newNode->getWritableType().getQualifier().makeSpecConstant();
return newNode;
}
@ -883,7 +890,6 @@ TIntermConstantUnion* TIntermediate::addConstantUnion(double d, TBasicType baseT
TIntermTyped* TIntermediate::addSwizzle(TVectorFields& fields, const TSourceLoc& loc)
{
TIntermAggregate* node = new TIntermAggregate(EOpSequence);
node->setLoc(loc);

6
glslang/MachineIndependent/ParseHelper.cpp
View File

@ -820,6 +820,9 @@ TIntermTyped* TParseContext::handleDotDereference(const TSourceLoc& loc, TInterm
return result;
else {
TType type(base->getBasicType(), EvqTemporary, fields.num);
// Swizzle operations propagate specialization-constantness
if (base->getQualifier().isSpecConstant())
type.getQualifier().makeSpecConstant();
return addConstructor(loc, base, type, mapTypeToConstructorOp(type));
}
}
@ -837,6 +840,9 @@ TIntermTyped* TParseContext::handleDotDereference(const TSourceLoc& loc, TInterm
result = intermediate.addIndex(EOpVectorSwizzle, base, index, loc);
result->setType(TType(base->getBasicType(), EvqTemporary, base->getType().getQualifier().precision, (int) vectorString.size()));
}
// Swizzle operations propagate specialization-constantness
if (base->getType().getQualifier().isSpecConstant())
result->getWritableType().getQualifier().makeSpecConstant();
}
} else if (base->getBasicType() == EbtStruct || base->getBasicType() == EbtBlock) {
const TTypeList* fields = base->getType().getStruct();