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Improved fix for buffer reference constants

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This is an alternate fix for the issue described in commit be63facd, whose
solution didn't work if there were non-trivial operations involved in computing
a constant initializer which caused the 'constant unfolding' code to kick in
(addConstantReferenceConversion). Instead, this change does the 'unfolding'
later in createSpvConstantFromConstUnionArray. If a reference-type constant has
survived that long, then folding is already done, this must be a 'real' (inside
a function) use of the constant, and it should be safe to unfold and apply the
bitcast.
This commit is contained in:
Jeff Bolz 2019-03-05 23:27:09 -06:00
parent 79d25ea0ce
commit 3fd1232665
6 changed files with 75 additions and 75 deletions
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18
glslang/MachineIndependent/Intermediate.cpp
View file

@ -725,19 +725,6 @@ TIntermTyped* TIntermediate::createConversion(TBasicType convertTo, TIntermTyped
return newNode;
}
// Convert a constant that is a reference type to a uint64_t constant plus a
// constructor instruction. This is needed because SPIR-V doesn't support
// OpConstant on pointer types.
TIntermTyped* TIntermediate::addConstantReferenceConversion(TIntermTyped* node)
{
if (node->getType().getBasicType() == EbtReference && node->getAsConstantUnion()) {
const TType &type = node->getType();
node = addBuiltInFunctionCall(node->getLoc(), EOpConvPtrToUint64, true, node, TType(EbtUint64));
node = addUnaryNode(EOpConstructReference, node, node->getLoc(), type);
}
return node;
}
TIntermTyped* TIntermediate::addConversion(TBasicType convertTo, TIntermTyped* node) const
{
return createConversion(convertTo, node);
@ -775,9 +762,6 @@ TIntermediate::addConversion(TOperator op, TIntermTyped* node0, TIntermTyped* no
return std::make_tuple(node0, node1);
}
node0 = addConstantReferenceConversion(node0);
node1 = addConstantReferenceConversion(node1);
auto promoteTo = std::make_tuple(EbtNumTypes, EbtNumTypes);
switch (op) {
@ -897,8 +881,6 @@ TIntermTyped* TIntermediate::addConversion(TOperator op, const TType& type, TInt
if (!isConversionAllowed(op, node))
return nullptr;
node = addConstantReferenceConversion(node);
// Otherwise, if types are identical, no problem
if (type == node->getType())
return node;

6
glslang/MachineIndependent/ParseHelper.cpp
View file

@ -6527,11 +6527,7 @@ TIntermNode* TParseContext::executeInitializer(const TSourceLoc& loc, TIntermTyp
// We either have a folded constant in getAsConstantUnion, or we have to use
// the initializer's subtree in the AST to represent the computation of a
// specialization constant.
// A third case arises when a reference type is made non-constant due to
// addConstantReferenceConversion, but reference types can't be const, so
// this is an error.
assert(initializer->getAsConstantUnion() || initializer->getType().getQualifier().isSpecConstant() ||
initializer->getType().getBasicType() == EbtReference);
assert(initializer->getAsConstantUnion() || initializer->getType().getQualifier().isSpecConstant());
if (initializer->getAsConstantUnion())
variable->setConstArray(initializer->getAsConstantUnion()->getConstArray());
else {

1
glslang/MachineIndependent/localintermediate.h
View file

@ -501,7 +501,6 @@ public:
TIntermTyped* addConversion(TBasicType convertTo, TIntermTyped* node) const;
void addBiShapeConversion(TOperator, TIntermTyped*& lhsNode, TIntermTyped*& rhsNode);
TIntermTyped* addShapeConversion(const TType&, TIntermTyped*);
TIntermTyped* addConstantReferenceConversion(TIntermTyped* node);
TIntermTyped* addBinaryMath(TOperator, TIntermTyped* left, TIntermTyped* right, TSourceLoc);
TIntermTyped* addAssign(TOperator op, TIntermTyped* left, TIntermTyped* right, TSourceLoc);
TIntermTyped* addIndex(TOperator op, TIntermTyped* base, TIntermTyped* index, TSourceLoc);