926fb685de
Since raw pointers are always passed around for IR construct without implying any ownership transfer, it can be error prone to have implicit ownership transferred the same way. For example this code can seem harmless: Pass *pass = .... pm.addPass(pass); pm.addPass(pass); pm.run(module); PiperOrigin-RevId: 263053082
122 lines
4.2 KiB
C++
122 lines
4.2 KiB
C++
//===- ConvertConst.cpp - Quantizes constant ops --------------------------===//
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//
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// Copyright 2019 The MLIR Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// =============================================================================
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#include "mlir/Dialect/QuantOps/Passes.h"
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#include "mlir/Dialect/QuantOps/QuantOps.h"
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#include "mlir/Dialect/QuantOps/QuantizeUtils.h"
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#include "mlir/Dialect/QuantOps/UniformSupport.h"
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#include "mlir/IR/Attributes.h"
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#include "mlir/IR/Matchers.h"
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#include "mlir/IR/PatternMatch.h"
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#include "mlir/IR/StandardTypes.h"
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#include "mlir/Pass/Pass.h"
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#include "mlir/StandardOps/Ops.h"
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using namespace mlir;
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using namespace mlir::quant;
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namespace {
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class ConvertConstPass : public FunctionPass<ConvertConstPass> {
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public:
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void runOnFunction() override;
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};
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struct QuantizedConstRewrite : public OpRewritePattern<QuantizeCastOp> {
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using OpRewritePattern<QuantizeCastOp>::OpRewritePattern;
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PatternMatchResult matchAndRewrite(QuantizeCastOp qbarrier,
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PatternRewriter &rewriter) const override;
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};
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} // end anonymous namespace
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/// Matches a [constant] -> [qbarrier] where the qbarrier results type is
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/// quantized and the operand type is quantizable.
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PatternMatchResult
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QuantizedConstRewrite::matchAndRewrite(QuantizeCastOp qbarrier,
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PatternRewriter &rewriter) const {
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Attribute value;
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// Is the operand a constant?
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if (!matchPattern(qbarrier.arg(), m_Constant(&value))) {
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return matchFailure();
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}
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// Does the qbarrier convert to a quantized type. This will not be true
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// if a quantized type has not yet been chosen or if the cast to an equivalent
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// storage type is not supported.
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Type qbarrierResultType = qbarrier.getResult()->getType();
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QuantizedType quantizedElementType =
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QuantizedType::getQuantizedElementType(qbarrierResultType);
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if (!quantizedElementType) {
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return matchFailure();
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}
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if (!QuantizedType::castToStorageType(qbarrierResultType)) {
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return matchFailure();
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}
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// Is the operand type compatible with the expressed type of the quantized
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// type? This will not be true if the qbarrier is superfluous (converts
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// from and to a quantized type).
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if (!quantizedElementType.isCompatibleExpressedType(
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qbarrier.arg()->getType())) {
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return matchFailure();
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}
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// Is the constant value a type expressed in a way that we support?
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if (!value.isa<FloatAttr>() && !value.isa<DenseElementsAttr>() &&
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!value.isa<SparseElementsAttr>()) {
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return matchFailure();
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}
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Type newConstValueType;
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auto newConstValue =
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quantizeAttr(value, quantizedElementType, newConstValueType);
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if (!newConstValue) {
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return matchFailure();
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}
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// When creating the new const op, use a fused location that combines the
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// original const and the qbarrier that led to the quantization.
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auto fusedLoc = FusedLoc::get(
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{qbarrier.arg()->getDefiningOp()->getLoc(), qbarrier.getLoc()},
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rewriter.getContext());
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auto newConstOp =
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rewriter.create<ConstantOp>(fusedLoc, newConstValueType, newConstValue);
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rewriter.replaceOpWithNewOp<StorageCastOp>({qbarrier.arg()}, qbarrier,
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qbarrier.getType(), newConstOp);
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return matchSuccess();
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}
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void ConvertConstPass::runOnFunction() {
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OwningRewritePatternList patterns;
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auto func = getFunction();
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auto *context = &getContext();
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patterns.insert<QuantizedConstRewrite>(context);
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applyPatternsGreedily(func, patterns);
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}
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std::unique_ptr<FunctionPassBase> mlir::quant::createConvertConstPass() {
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return llvm::make_unique<ConvertConstPass>();
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}
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static PassRegistration<ConvertConstPass>
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pass("quant-convert-const",
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"Converts constants followed by qbarrier to actual quantized values");
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