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// slang-ir-autodiff-transcriber-base.h
#pragma once
#include "slang-compiler.h"
#include "slang-ir-autodiff.h"
#include "slang-ir-insts.h"
#include "slang-ir.h"
namespace Slang
{
struct AutoDiffTranscriberBase
{
// Stores the mapping of arbitrary 'R-value' instructions to instructions that represent
// their differential values.
Dictionary<IRInst*, IRInst*> instMapD;
// Set of insts currently being transcribed. Used to avoid infinite loops.
HashSet<IRInst*> instsInProgress;
// Cloning environment to hold mapping from old to new copies for the primal
// instructions.
IRCloneEnv cloneEnv;
// Diagnostic sink for error messages.
DiagnosticSink* sink;
// Type conformance information.
AutoDiffSharedContext* autoDiffSharedContext;
// Builder to help with creating and accessing the 'DifferentiablePair<T>' struct
DifferentialPairTypeBuilder* pairBuilder;
DifferentiableTypeConformanceContext differentiableTypeConformanceContext;
AutoDiffTranscriberBase(AutoDiffSharedContext* shared, DiagnosticSink* inSink)
: autoDiffSharedContext(shared), differentiableTypeConformanceContext(shared), sink(inSink)
{
cloneEnv.squashChildrenMapping = true;
}
DiagnosticSink* getSink();
// Returns "dp<var-name>" to use as a name hint for parameters.
// If no primal name is available, returns a blank string.
//
String makeDiffPairName(IRInst* origVar);
void mapDifferentialInst(IRInst* origInst, IRInst* diffInst);
void mapPrimalInst(IRInst* origInst, IRInst* primalInst);
IRInst* lookupDiffInst(IRInst* origInst);
IRInst* lookupDiffInst(IRInst* origInst, IRInst* defaultInst);
bool hasDifferentialInst(IRInst* origInst);
bool shouldUseOriginalAsPrimal(IRInst* currentParent, IRInst* origInst);
IRInst* lookupPrimalInstImpl(IRInst* currentParent, IRInst* origInst);
IRInst* lookupPrimalInst(IRInst* currentParent, IRInst* origInst, IRInst* defaultInst);
IRInst* lookupPrimalInstIfExists(IRBuilder* builder, IRInst* origInst)
{
return lookupPrimalInst(builder->getInsertLoc().getParent(), origInst, origInst);
}
IRInst* lookupPrimalInst(IRBuilder* builder, IRInst* origInst)
{
return lookupPrimalInstImpl(builder->getInsertLoc().getParent(), origInst);
}
IRInst* lookupPrimalInst(IRBuilder* builder, IRInst* origInst, IRInst* defaultInst)
{
return lookupPrimalInst(builder->getInsertLoc().getParent(), origInst, defaultInst);
}
bool hasPrimalInst(IRInst* currentParent, IRInst* origInst);
IRInst* findOrTranscribeDiffInst(IRBuilder* builder, IRInst* origInst);
IRInst* findOrTranscribePrimalInst(IRBuilder* builder, IRInst* origInst);
IRInst* maybeCloneForPrimalInst(IRBuilder* builder, IRInst* inst);
InstPair transcribeExtractExistentialWitnessTable(IRBuilder* builder, IRInst* origInst);
void maybeMigrateDifferentiableDictionaryFromDerivativeFunc(
IRBuilder* builder,
IRInst* origFunc);
IRInst* tryGetDifferentiableWitness(
IRBuilder* builder,
IRInst* originalType,
DiffConformanceKind kind);
IRType* getOrCreateDiffPairType(IRBuilder* builder, IRInst* primalType, IRInst* witness);
IRType* getOrCreateDiffPairType(IRBuilder* builder, IRInst* originalType);
IRType* differentiateType(IRBuilder* builder, IRType* origType);
IRType* differentiateExtractExistentialType(
IRBuilder* builder,
IRExtractExistentialType* origType,
IRInst*& witnessTable);
IRType* tryGetDiffPairType(IRBuilder* builder, IRType* primalType);
IRInst* getDifferentialZeroOfType(IRBuilder* builder, IRType* primalType);
InstPair transcribeNonDiffInst(IRBuilder* builder, IRInst* origInst);
InstPair transcribeReturn(IRBuilder* builder, IRReturn* origReturn);
InstPair transcribeParam(IRBuilder* builder, IRParam* origParam);
virtual InstPair transcribeFuncParam(
IRBuilder* builder,
IRParam* origParam,
IRInst* primalType) = 0;
InstPair transcribeLookupInterfaceMethod(IRBuilder* builder, IRLookupWitnessMethod* lookupInst);
InstPair transcribeBlockImpl(
IRBuilder* builder,
IRBlock* origBlock,
HashSet<IRInst*>& instsToSkip);
InstPair transcribeBlock(IRBuilder* builder, IRBlock* origBlock)
{
HashSet<IRInst*> ignore;
for (auto inst = origBlock->getFirstInst(); inst; inst = inst->next)
{
if (inst->m_op == kIROp_Unmodified)
ignore.add(inst);
}
return transcribeBlockImpl(builder, origBlock, ignore);
}
// Transcribe a generic definition
InstPair transcribeGeneric(IRBuilder* inBuilder, IRGeneric* origGeneric);
IRInst* transcribe(IRBuilder* builder, IRInst* origInst);
InstPair transcribeInst(IRBuilder* builder, IRInst* origInst);
IRType* _differentiateTypeImpl(IRBuilder* builder, IRType* origType);
bool isExistentialType(IRType* type);
void _markInstAsDifferential(
IRBuilder* builder,
IRInst* diffInst,
IRInst* primalInst = nullptr);
void copyOriginalDecorations(IRInst* origFunc, IRInst* diffFunc);
virtual IRFuncType* differentiateFunctionType(
IRBuilder* builder,
IRInst* func,
IRFuncType* funcType) = 0;
// Create an empty func to represent the transcribed func of `origFunc`.
virtual InstPair transcribeFuncHeader(IRBuilder* inBuilder, IRFunc* origFunc) = 0;
virtual InstPair transcribeInstImpl(IRBuilder* builder, IRInst* origInst) = 0;
virtual IROp getInterfaceRequirementDerivativeDecorationOp() = 0;
void markDiffTypeInst(IRBuilder* builder, IRInst* inst, IRType* primalType);
void markDiffPairTypeInst(IRBuilder* builder, IRInst* inst, IRType* primalType);
};
} // namespace Slang
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