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HLSL: Remove workarounds for assigning to opaques.

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This assumes it will be combined with optimizing transforms
that eliminate assignments to opaques.
This commit is contained in:
John Kessenich 2017-09-07 04:33:11 -06:00 • committed by GregF
parent dabd1bf2f0
commit 15fa7ef5f5
7 changed files with 313 additions and 234 deletions
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133
hlsl/hlslParseHelper.cpp
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@ -166,11 +166,6 @@ bool HlslParseContext::shouldConvertLValue(const TIntermNode* node) const
if (lhsAsAggregate != nullptr && lhsAsAggregate->getOp() == EOpImageLoad)
return true;
// If it's a syntactic write to a sampler, we will use that to establish
// a compile-time alias.
if (node->getAsTyped()->getBasicType() == EbtSampler)
return true;
return false;
}
@ -239,6 +234,13 @@ bool HlslParseContext::lValueErrorCheck(const TSourceLoc& loc, const char* op, T
}
}
// We tolerate samplers as l-values, even though they are nominally
// illegal, because we expect a later optimization to eliminate them.
if (node->getType().getBasicType() == EbtSampler) {
intermediate.setNeedsLegalization();
return false;
}
// Let the base class check errors
return TParseContextBase::lValueErrorCheck(loc, op, node);
}
@ -274,10 +276,6 @@ TIntermTyped* HlslParseContext::handleLvalue(const TSourceLoc& loc, const char*
// *** If we get here, we're going to apply some conversion to an l-value.
// Spin off sampler aliasing
if (node->getAsTyped()->getBasicType() == EbtSampler)
return handleSamplerLvalue(loc, op, node);
// Helper to create a load.
const auto makeLoad = [&](TIntermSymbol* rhsTmp, TIntermTyped* object, TIntermTyped* coord, const TType& derefType) {
TIntermAggregate* loadOp = new TIntermAggregate(EOpImageLoad);
@ -524,58 +522,6 @@ TIntermTyped* HlslParseContext::handleLvalue(const TSourceLoc& loc, const char*
return node;
}
// Deal with sampler aliasing: turning assignments into aliases
// Return a placeholder node for higher-level code that think assignments must
// generate code.
TIntermTyped* HlslParseContext::handleSamplerLvalue(const TSourceLoc& loc, const char* op, TIntermTyped*& node)
{
// Can only alias an assignment: "s1 = s2"
TIntermBinary* binary = node->getAsBinaryNode();
if (binary == nullptr || node->getAsOperator()->getOp() != EOpAssign ||
binary->getLeft()->getAsSymbolNode() == nullptr ||
binary->getRight()->getAsSymbolNode() == nullptr) {
error(loc, "can't modify sampler", op, "");
return node;
}
if (controlFlowNestingLevel > 0)
warn(loc, "sampler or image aliased under control flow; consumption must be in same path", op, "");
TIntermTyped* set = setOpaqueLvalue(binary->getLeft(), binary->getRight());
if (set == nullptr)
warn(loc, "could not create alias for sampler", op, "");
else
node = set;
return node;
}
// Do an opaque assignment that needs to turn into an alias.
// Return nullptr if it can't be done, otherwise return a placeholder
// node for higher-level code that think assignments must generate code.
TIntermTyped* HlslParseContext::setOpaqueLvalue(TIntermTyped* leftTyped, TIntermTyped* rightTyped)
{
// Best is if we are aliasing a flattened struct member "S.s1 = s2",
// in which case we want to update the flattening information with the alias,
// making everything else work seamlessly.
TIntermSymbol* left = leftTyped->getAsSymbolNode();
TIntermSymbol* right = rightTyped->getAsSymbolNode();
for (auto fit = flattenMap.begin(); fit != flattenMap.end(); ++fit) {
for (auto mit = fit->second.members.begin(); mit != fit->second.members.end(); ++mit) {
if ((*mit)->getUniqueId() == left->getId()) {
// found it: update with alias to the existing variable, and don't emit any code
(*mit) = new TVariable(&right->getName(), right->getType());
(*mit)->setUniqueId(right->getId());
// replace node (rest of compiler expects either an error or code to generate)
// with pointless access
return right;
}
}
}
return nullptr;
}
void HlslParseContext::handlePragma(const TSourceLoc& loc, const TVector<TString>& tokens)
{
if (pragmaCallback)
@ -2513,41 +2459,6 @@ TIntermAggregate* HlslParseContext::assignClipCullDistance(const TSourceLoc& loc
return assignList;
}
// For a declaration with an initializer, where the initialized symbol is flattened,
// and possibly contains opaque values, such that the initializer should never exist
// as emitted code, because even creating the initializer would write opaques.
//
// If possible, decompose this into individual member-wise assignments, which themselves
// are expected to then not exist for opaque types, because they will turn into aliases.
//
// Return a node that contains the non-aliased assignments that must continue to exist.
TIntermTyped* HlslParseContext::executeFlattenedInitializer(const TSourceLoc& loc, TIntermSymbol* symbol,
TIntermAggregate& initializer)
{
// We need individual RHS initializers per member to do this
const TTypeList* typeList = symbol->getType().getStruct();
if (typeList == nullptr || initializer.getSequence().size() != typeList->size()) {
warn(loc, "cannot do member-wise aliasing for opaque members with this initializer", "=", "");
return handleAssign(loc, EOpAssign, symbol, &initializer);
}
TIntermAggregate* initList = nullptr;
// synthesize an access to each member, and then an assignment to it
for (int member = 0; member < (int)typeList->size(); ++member) {
TIntermTyped* memberInitializer = initializer.getSequence()[member]->getAsTyped();
TIntermTyped* flattenedMember = flattenAccess(symbol, member);
if (flattenedMember->getType().containsOpaque())
setOpaqueLvalue(flattenedMember, memberInitializer);
else
initList = intermediate.growAggregate(initList, handleAssign(loc, EOpAssign, flattenedMember,
memberInitializer));
}
if (initList)
initList->setOperator(EOpSequence);
return initList;
}
// Some simple source assignments need to be flattened to a sequence
// of AST assignments. Catch these and flatten, otherwise, pass through
// to intermediate.addAssign().
@ -2560,6 +2471,10 @@ TIntermTyped* HlslParseContext::handleAssign(const TSourceLoc& loc, TOperator op
if (left == nullptr || right == nullptr)
return nullptr;
// writing to opaques will require fixing transforms
if (left->getType().containsOpaque())
intermediate.setNeedsLegalization();
if (left->getAsOperator() && left->getAsOperator()->getOp() == EOpMatrixSwizzle)
return handleAssignToMatrixSwizzle(loc, op, left, right);
@ -2720,7 +2635,8 @@ TIntermTyped* HlslParseContext::handleAssign(const TSourceLoc& loc, TOperator op
const int elementsL = left->getType().isArray() ? left->getType().getOuterArraySize() : 1;
const int elementsR = right->getType().isArray() ? right->getType().getOuterArraySize() : 1;
// The arrays may not be the same size, e.g, if the size has been forced for EbvTessLevelInner or Outer.
// The arrays might not be the same size,
// e.g., if the size has been forced for EbvTessLevelInner/Outer.
const int elementsToCopy = std::min(elementsL, elementsR);
// array case
@ -7616,20 +7532,10 @@ TIntermNode* HlslParseContext::executeInitializer(const TSourceLoc& loc, TInterm
// normal assigning of a value to a variable...
specializationCheck(loc, initializer->getType(), "initializer");
TIntermSymbol* intermSymbol = intermediate.addSymbol(*variable, loc);
// If we are flattening, it could be due to setting opaques, which must be handled
// as aliases, and the 'initializer' node cannot actually be emitted, because it
// itself stores the result of the constructor, and we can't store to opaques.
// handleAssign() will emit the initializer.
TIntermNode* initNode = nullptr;
if (flattened && intermSymbol->getType().containsOpaque())
return executeFlattenedInitializer(loc, intermSymbol, *initializer->getAsAggregate());
else {
initNode = handleAssign(loc, EOpAssign, intermSymbol, initializer);
if (initNode == nullptr)
assignError(loc, "=", intermSymbol->getCompleteString(), initializer->getCompleteString());
return initNode;
}
TIntermNode* initNode = handleAssign(loc, EOpAssign, intermSymbol, initializer);
if (initNode == nullptr)
assignError(loc, "=", intermSymbol->getCompleteString(), initializer->getCompleteString());
return initNode;
}
return nullptr;
@ -9517,6 +9423,11 @@ void HlslParseContext::finish()
error(mipsOperatorMipArg.back().loc, "unterminated mips operator:", "", "");
}
// Communicate out (esp. for command line) that we formed AST that will make
// illegal AST SPIR-V and it needs transforms to legalize it.
if (intermediate.needsLegalization())
infoSink.info << "WARNING: AST will form illegal SPIR-V; need to transform to legalize";
removeUnusedStructBufferCounters();
addPatchConstantInvocation();
fixTextureShadowModes();