6fb3d59746
Summary: Remove 'valuesToRemoveIfDead' from PatternRewriter API. The removal functionality wasn't implemented and we decided [1] not to implement it in favor of having more powerful DCE approaches. [1] https://github.com/tensorflow/mlir/pull/212 Reviewers: rriddle, bondhugula Reviewed By: rriddle Subscribers: liufengdb, mehdi_amini, rriddle, jpienaar, burmako, shauheen, antiagainst, nicolasvasilache, arpith-jacob, mgester, lucyrfox, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D72545
113 lines
3.8 KiB
C++
113 lines
3.8 KiB
C++
//===- ConvertConst.cpp - Quantizes constant ops --------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "mlir/Dialect/QuantOps/Passes.h"
|
|
#include "mlir/Dialect/QuantOps/QuantOps.h"
|
|
#include "mlir/Dialect/QuantOps/QuantizeUtils.h"
|
|
#include "mlir/Dialect/QuantOps/UniformSupport.h"
|
|
#include "mlir/Dialect/StandardOps/Ops.h"
|
|
#include "mlir/IR/Attributes.h"
|
|
#include "mlir/IR/Matchers.h"
|
|
#include "mlir/IR/PatternMatch.h"
|
|
#include "mlir/IR/StandardTypes.h"
|
|
#include "mlir/Pass/Pass.h"
|
|
|
|
using namespace mlir;
|
|
using namespace mlir::quant;
|
|
|
|
namespace {
|
|
|
|
class ConvertConstPass : public FunctionPass<ConvertConstPass> {
|
|
public:
|
|
void runOnFunction() override;
|
|
};
|
|
|
|
struct QuantizedConstRewrite : public OpRewritePattern<QuantizeCastOp> {
|
|
using OpRewritePattern<QuantizeCastOp>::OpRewritePattern;
|
|
|
|
PatternMatchResult matchAndRewrite(QuantizeCastOp qbarrier,
|
|
PatternRewriter &rewriter) const override;
|
|
};
|
|
|
|
} // end anonymous namespace
|
|
|
|
/// Matches a [constant] -> [qbarrier] where the qbarrier results type is
|
|
/// quantized and the operand type is quantizable.
|
|
|
|
PatternMatchResult
|
|
QuantizedConstRewrite::matchAndRewrite(QuantizeCastOp qbarrier,
|
|
PatternRewriter &rewriter) const {
|
|
Attribute value;
|
|
|
|
// Is the operand a constant?
|
|
if (!matchPattern(qbarrier.arg(), m_Constant(&value))) {
|
|
return matchFailure();
|
|
}
|
|
|
|
// Does the qbarrier convert to a quantized type. This will not be true
|
|
// if a quantized type has not yet been chosen or if the cast to an equivalent
|
|
// storage type is not supported.
|
|
Type qbarrierResultType = qbarrier.getResult().getType();
|
|
QuantizedType quantizedElementType =
|
|
QuantizedType::getQuantizedElementType(qbarrierResultType);
|
|
if (!quantizedElementType) {
|
|
return matchFailure();
|
|
}
|
|
if (!QuantizedType::castToStorageType(qbarrierResultType)) {
|
|
return matchFailure();
|
|
}
|
|
|
|
// Is the operand type compatible with the expressed type of the quantized
|
|
// type? This will not be true if the qbarrier is superfluous (converts
|
|
// from and to a quantized type).
|
|
if (!quantizedElementType.isCompatibleExpressedType(
|
|
qbarrier.arg().getType())) {
|
|
return matchFailure();
|
|
}
|
|
|
|
// Is the constant value a type expressed in a way that we support?
|
|
if (!value.isa<FloatAttr>() && !value.isa<DenseElementsAttr>() &&
|
|
!value.isa<SparseElementsAttr>()) {
|
|
return matchFailure();
|
|
}
|
|
|
|
Type newConstValueType;
|
|
auto newConstValue =
|
|
quantizeAttr(value, quantizedElementType, newConstValueType);
|
|
if (!newConstValue) {
|
|
return matchFailure();
|
|
}
|
|
|
|
// When creating the new const op, use a fused location that combines the
|
|
// original const and the qbarrier that led to the quantization.
|
|
auto fusedLoc = FusedLoc::get(
|
|
{qbarrier.arg().getDefiningOp()->getLoc(), qbarrier.getLoc()},
|
|
rewriter.getContext());
|
|
auto newConstOp =
|
|
rewriter.create<ConstantOp>(fusedLoc, newConstValueType, newConstValue);
|
|
rewriter.replaceOpWithNewOp<StorageCastOp>(qbarrier, qbarrier.getType(),
|
|
newConstOp);
|
|
return matchSuccess();
|
|
}
|
|
|
|
void ConvertConstPass::runOnFunction() {
|
|
OwningRewritePatternList patterns;
|
|
auto func = getFunction();
|
|
auto *context = &getContext();
|
|
patterns.insert<QuantizedConstRewrite>(context);
|
|
applyPatternsGreedily(func, patterns);
|
|
}
|
|
|
|
std::unique_ptr<OpPassBase<FuncOp>> mlir::quant::createConvertConstPass() {
|
|
return std::make_unique<ConvertConstPass>();
|
|
}
|
|
|
|
static PassRegistration<ConvertConstPass>
|
|
pass("quant-convert-const",
|
|
"Converts constants followed by qbarrier to actual quantized values");
|