torch-mlir/lib/Dialect/Numpy/IR/NumpyOps.cpp

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2020-04-27 08:20:58 +08:00
//===- NumpyOps.cpp - Core numpy dialect ops --------------------*- C++ -*-===//
//
// This file is licensed 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 "npcomp/Dialect/Numpy/IR/NumpyOps.h"
#include "mlir/IR/Builders.h"
#include "mlir/IR/FunctionImplementation.h"
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#include "mlir/IR/OpImplementation.h"
#include "mlir/IR/PatternMatch.h"
#include "npcomp/Dialect/Basicpy/IR/BasicpyDialect.h"
#include "npcomp/Dialect/Numpy/IR/NumpyDialect.h"
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using namespace mlir;
using namespace mlir::NPCOMP;
using namespace mlir::NPCOMP::Numpy;
//----------------------------------------------------------------------------//
// Type inference
//----------------------------------------------------------------------------//
/// Adds constraints to relating a unary op that accepts and returns either
/// tensor or ndarray types where the dtype should be the same.
/// Type constraints are added on the dtype, not the outer object type.
static void constrainUnaryDtypeInvariantOp(Typing::CPA::Context &context,
Value source, Value dest,
Operation *op) {
auto &env = context.getCurrentEnvironment();
auto *sourceTn =
llvm::dyn_cast<Typing::CPA::ObjectValueType>(env.mapValueToType(source));
auto *destTn =
llvm::dyn_cast<Typing::CPA::ObjectValueType>(env.mapValueToType(dest));
if (sourceTn && destTn && sourceTn->getFieldCount() == 1 &&
destTn->getFieldCount() == 1) {
context.getConstraint(sourceTn->getFieldTypes().front(),
destTn->getFieldTypes().front());
}
}
void CreateArrayFromTensorOp::addCPAConstraints(Typing::CPA::Context &context) {
constrainUnaryDtypeInvariantOp(context, source(), dest(), *this);
}
void CopyToTensorOp::addCPAConstraints(Typing::CPA::Context &context) {
constrainUnaryDtypeInvariantOp(context, source(), dest(), *this);
}
void BuiltinUfuncCallOp::addCPAConstraints(Typing::CPA::Context &context) {
// TODO: This should really be a function call chosen so as to promote
// arguments. For now, though, we just say that the result is constrained
// to the inputs. Note that not all ufuncs transfer types like this.
// We just pretend this is two unary functions that write into the output.
for (auto input : inputs()) {
constrainUnaryDtypeInvariantOp(context, input, output(), *this);
}
}
//----------------------------------------------------------------------------//
// CreateArrayFromTensorOp
//----------------------------------------------------------------------------//
namespace {
/// Match create_array_from_tensor -> copy_to_tensor and elide in favor
/// of the original tensor.
class ElideCreateRedundantArrayFromTensor
: public OpRewritePattern<CopyToTensorOp> {
public:
using OpRewritePattern::OpRewritePattern;
LogicalResult matchAndRewrite(CopyToTensorOp op,
PatternRewriter &rewriter) const override {
auto createArrayOp =
dyn_cast_or_null<CreateArrayFromTensorOp>(op.source().getDefiningOp());
if (createArrayOp && createArrayOp.dest().hasOneUse()) {
rewriter.replaceOp(op, createArrayOp.source());
}
return success();
}
};
} // namespace
void CopyToTensorOp::getCanonicalizationPatterns(
OwningRewritePatternList &patterns, MLIRContext *context) {
patterns.insert<ElideCreateRedundantArrayFromTensor>(context);
}
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#define GET_OP_CLASSES
#include "npcomp/Dialect/Numpy/IR/NumpyOps.cpp.inc"