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
115 lines
3.9 KiB
C++
115 lines
3.9 KiB
C++
//===- ConvertSimQuant.cpp - Converts simulated quant 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/FakeQuantSupport.h"
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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/UniformSupport.h"
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#include "mlir/IR/Attributes.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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using namespace mlir;
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using namespace mlir::quant;
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namespace {
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class ConvertSimulatedQuantPass
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: public FunctionPass<ConvertSimulatedQuantPass> {
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public:
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void runOnFunction() override;
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};
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} // end anonymous namespace
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/// Rewrites ConstFakeQuant into a qbarrier/dbarrier pair.
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class ConstFakeQuantRewrite : public RewritePattern {
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public:
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bool *hadFailure;
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ConstFakeQuantRewrite(MLIRContext *context, bool *hadFailure)
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: RewritePattern(ConstFakeQuant::getOperationName(), 1, context),
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hadFailure(hadFailure) {}
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PatternMatchResult matchAndRewrite(Operation *op,
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PatternRewriter &rewriter) const override {
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// TODO: If this pattern comes up more frequently, consider adding core
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// support for failable rewrites.
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if (failableRewrite(op, rewriter)) {
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*hadFailure = true;
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return matchFailure();
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}
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return matchSuccess();
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}
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bool failableRewrite(Operation *op, PatternRewriter &rewriter) const {
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auto fqOp = cast<ConstFakeQuant>(op);
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auto converter =
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ExpressedToUniformQuantizedConverter::forInputType(fqOp.getType());
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if (!converter) {
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return (op->emitError("unsupported quantized type conversion"), true);
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}
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UniformQuantizedType uniformElementType = fakeQuantAttrsToType(
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fqOp.getLoc(), fqOp.num_bits().getSExtValue(),
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fqOp.min().convertToFloat(), fqOp.max().convertToFloat(),
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fqOp.narrow_range(), converter.expressedType, fqOp.is_signed());
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if (!uniformElementType) {
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// Note that the fakeQuantAttrsToType will have emitted the error.
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return true;
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}
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Type quantizedType = converter.convert(uniformElementType);
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assert(quantizedType &&
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"Converter accepted a type that it did not convert");
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// TODO: Map to a qbarrier with an attribute like [Forced] to signal that
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// this is a forced/hard-coded constraint.
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auto qbarrier = rewriter.create<QuantizeCastOp>(op->getLoc(), quantizedType,
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fqOp.inputs());
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rewriter.replaceOpWithNewOp<DequantizeCastOp>(op, converter.inputType,
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qbarrier.getResult());
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return false;
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}
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};
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void ConvertSimulatedQuantPass::runOnFunction() {
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bool hadFailure = false;
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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<ConstFakeQuantRewrite>(context, &hadFailure);
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applyPatternsGreedily(func, patterns);
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if (hadFailure)
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signalPassFailure();
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}
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std::unique_ptr<FunctionPassBase>
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mlir::quant::createConvertSimulatedQuantPass() {
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return llvm::make_unique<ConvertSimulatedQuantPass>();
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}
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static PassRegistration<ConvertSimulatedQuantPass>
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pass("quant-convert-simulated-quantization",
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"Converts training-time simulated quantization ops to corresponding "
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"quantize/dequantize casts.");
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