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//===- MemRefUtils.cpp - MLIR runtime utilities for memrefs ---------------===//
//
// Copyright 2019 The MLIR Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// =============================================================================
//
// This is a set of utilities to working with objects of memref type in an JIT
// context using the MLIR execution engine.
//
//===----------------------------------------------------------------------===//
#include "mlir/ExecutionEngine/MemRefUtils.h"
#include "mlir/IR/Function.h"
#include "mlir/IR/StandardTypes.h"
#include "mlir/Support/LLVM.h"
#include "llvm/Support/Error.h"
#include <numeric>
using namespace mlir;
static inline llvm::Error make_string_error(const llvm::Twine &message) {
return llvm::make_error<llvm::StringError>(message.str(),
llvm::inconvertibleErrorCode());
}
static llvm::Expected<StaticFloatMemRef *>
allocMemRefDescriptor(Type type, bool allocateData = true,
float initialValue = 0.0) {
auto memRefType = type.dyn_cast<MemRefType>();
if (!memRefType)
return make_string_error("non-memref argument not supported");
if (!memRefType.hasStaticShape())
return make_string_error("memref with dynamic shapes not supported");
auto elementType = memRefType.getElementType();
if (!elementType.isF32())
return make_string_error(
"memref with element other than f32 not supported");
auto *descriptor =
reinterpret_cast<StaticFloatMemRef *>(malloc(sizeof(StaticFloatMemRef)));
if (!allocateData) {
descriptor->data = nullptr;
return descriptor;
}
auto shape = memRefType.getShape();
int64_t size = std::accumulate(shape.begin(), shape.end(), 1,
std::multiplies<int64_t>());
descriptor->data = reinterpret_cast<float *>(malloc(sizeof(float) * size));
for (int64_t i = 0; i < size; ++i) {
descriptor->data[i] = initialValue;
}
return descriptor;
}
llvm::Expected<SmallVector<void *, 8>>
mlir::allocateMemRefArguments(Function func, float initialValue) {
SmallVector<void *, 8> args;
args.reserve(func.getNumArguments());
for (const auto &arg : func.getArguments()) {
auto descriptor =
allocMemRefDescriptor(arg->getType(),
/*allocateData=*/true, initialValue);
if (!descriptor)
return descriptor.takeError();
args.push_back(*descriptor);
}
if (func.getType().getNumResults() > 1)
return make_string_error("functions with more than 1 result not supported");
for (Type resType : func.getType().getResults()) {
auto descriptor = allocMemRefDescriptor(resType, /*allocateData=*/false);
if (!descriptor)
return descriptor.takeError();
args.push_back(*descriptor);
}
return args;
}
// Because the function can return the same descriptor as passed in arguments,
// we check that we don't attempt to free the underlying data twice.
void mlir::freeMemRefArguments(ArrayRef<void *> args) {
llvm::DenseSet<void *> dataPointers;
for (void *arg : args) {
float *dataPtr = reinterpret_cast<StaticFloatMemRef *>(arg)->data;
if (dataPointers.count(dataPtr) == 0) {
free(dataPtr);
dataPointers.insert(dataPtr);
}
free(arg);
}
}
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