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The differentiation transform does the following:
- Canonicalizes differentiability witnesses by filling in missing derivative
function entries.
- Canonicalizes `differentiable_function` instructions by filling in missing
derivative function operands.
- If necessary, performs automatic differentiation: generating derivative
functions for original functions.
- When encountering non-differentiability code, produces a diagnostic and
errors out.
Partially resolves TF-1211: add the main canonicalization loop.
To incrementally stage changes, derivative functions are currently created
with empty bodies that fatal error with a nice message.
Derivative emitters will be upstreamed separately.
49 lines
1.8 KiB
C++
49 lines
1.8 KiB
C++
//===--- GenDiffWitness.cpp - IRGen for differentiability witnesses -------===//
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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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// This file implements IR generation for SIL differentiability witnesses.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/AST/PrettyStackTrace.h"
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#include "swift/SIL/SILDifferentiabilityWitness.h"
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#include "ConstantBuilder.h"
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#include "IRGenModule.h"
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using namespace swift;
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using namespace irgen;
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void IRGenModule::emitSILDifferentiabilityWitness(
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SILDifferentiabilityWitness *dw) {
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PrettyStackTraceDifferentiabilityWitness _st(
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"emitting differentiability witness for", dw->getKey());
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// Don't emit declarations.
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if (dw->isDeclaration())
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return;
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// Don't emit `public_external` witnesses.
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if (dw->getLinkage() == SILLinkage::PublicExternal)
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return;
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ConstantInitBuilder builder(*this);
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auto diffWitnessContents = builder.beginStruct();
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assert(dw->getJVP() &&
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"Differentiability witness definition should have JVP");
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assert(dw->getVJP() &&
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"Differentiability witness definition should have VJP");
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diffWitnessContents.addBitCast(
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getAddrOfSILFunction(dw->getJVP(), NotForDefinition), Int8PtrTy);
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diffWitnessContents.addBitCast(
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getAddrOfSILFunction(dw->getVJP(), NotForDefinition), Int8PtrTy);
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getAddrOfDifferentiabilityWitness(
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dw, diffWitnessContents.finishAndCreateFuture());
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}
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