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1d961ba22d
Although I don't plan to bring over new assertions wholesale into the current qualification branch, it's entirely possible that various minor changes in main will use the new assertions; having this basic support in the release branch will simplify that. (This is why I'm adding the includes as a separate pass from rewriting the individual assertions)
73 lines
2.5 KiB
C++
73 lines
2.5 KiB
C++
//===--- DifferentiabilityWitnessDevirtualizer.cpp ------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2020 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// Devirtualizes `differentiability_witness_function` instructions into
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// `function_ref` instructions for differentiability witness definitions.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/Basic/Assertions.h"
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#include "swift/SIL/SILBuilder.h"
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#include "swift/SIL/SILFunction.h"
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#include "swift/SIL/SILInstruction.h"
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#include "swift/SILOptimizer/PassManager/Transforms.h"
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using namespace swift;
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namespace {
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class DifferentiabilityWitnessDevirtualizer : public SILFunctionTransform {
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/// Returns true if any changes were made.
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bool devirtualizeDifferentiabilityWitnessesInFunction(SILFunction &f);
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/// The entry point to the transformation.
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void run() override {
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if (devirtualizeDifferentiabilityWitnessesInFunction(*getFunction()))
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invalidateAnalysis(SILAnalysis::InvalidationKind::CallsAndInstructions);
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}
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};
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} // end anonymous namespace
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bool DifferentiabilityWitnessDevirtualizer::
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devirtualizeDifferentiabilityWitnessesInFunction(SILFunction &f) {
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bool changed = false;
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llvm::SmallVector<DifferentiabilityWitnessFunctionInst *, 8> insts;
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for (auto &bb : f) {
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for (auto &inst : bb) {
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auto *dfwi = dyn_cast<DifferentiabilityWitnessFunctionInst>(&inst);
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if (!dfwi)
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continue;
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insts.push_back(dfwi);
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}
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}
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for (auto *inst : insts) {
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auto *witness = inst->getWitness();
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if (witness->isDeclaration())
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f.getModule().loadDifferentiabilityWitness(witness);
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if (witness->isDeclaration())
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continue;
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changed = true;
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SILBuilderWithScope builder(inst);
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auto kind = inst->getWitnessKind().getAsDerivativeFunctionKind();
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assert(kind.has_value());
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auto *newInst = builder.createFunctionRefFor(inst->getLoc(),
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witness->getDerivative(*kind));
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inst->replaceAllUsesWith(newInst);
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inst->getParent()->erase(inst);
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}
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return changed;
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}
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SILTransform *swift::createDifferentiabilityWitnessDevirtualizer() {
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return new DifferentiabilityWitnessDevirtualizer();
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}
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