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//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file contains the definition of the HostRefChecker class, which
/// verifies the results of a device computation against a reference
/// implementation on the host.
///
//===----------------------------------------------------------------------===//
#ifndef MATHTEST_HOSTREFCHECKER_HPP
#define MATHTEST_HOSTREFCHECKER_HPP
#include "mathtest/Numerics.hpp"
#include "mathtest/Support.hpp"
#include "mathtest/TestResult.hpp"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/Sequence.h"
#include "llvm/Support/Parallel.h"
#include <cstddef>
#include <tuple>
#include <utility>
namespace mathtest {
template <auto Func> class HostRefChecker {
using FunctionTraits = FunctionTraits<Func>;
using InTypesTuple = typename FunctionTraits::ArgTypesTuple;
using FunctionConfig = FunctionConfig<Func>;
template <typename... Ts>
using BuffersTupleType = std::tuple<llvm::ArrayRef<Ts>...>;
public:
using OutType = typename FunctionTraits::ReturnType;
private:
template <typename... Ts>
using PartialResultType = TestResult<OutType, Ts...>;
public:
using ResultType = ApplyTupleTypes_t<InTypesTuple, PartialResultType>;
using InBuffersTupleType = ApplyTupleTypes_t<InTypesTuple, BuffersTupleType>;
HostRefChecker() = delete;
static ResultType check(InBuffersTupleType InBuffersTuple,
llvm::ArrayRef<OutType> OutBuffer) noexcept {
const std::size_t BufferSize = OutBuffer.size();
std::apply(
[&](const auto &...InBuffers) {
assert(
((InBuffers.size() == BufferSize) && ...) &&
"All input buffers must have the same size as the output buffer");
},
InBuffersTuple);
assert((BufferSize != 0) && "Buffer size cannot be zero");
ResultType Init;
auto Transform = [&](std::size_t Index) {
auto CurrentInputsTuple = std::apply(
[&](const auto &...InBuffers) {
return std::make_tuple(InBuffers[Index]...);
},
InBuffersTuple);
const OutType Actual = OutBuffer[Index];
const OutType Expected = std::apply(Func, CurrentInputsTuple);
const auto UlpDistance = computeUlpDistance(Actual, Expected);
const bool IsFailure = UlpDistance > FunctionConfig::UlpTolerance;
return ResultType(UlpDistance, IsFailure,
typename ResultType::TestCase(
std::move(CurrentInputsTuple), Actual, Expected));
};
auto Reduce = [](ResultType A, const ResultType &B) {
A.accumulate(B);
return A;
};
const auto Indexes = llvm::seq(BufferSize);
return llvm::parallelTransformReduce(Indexes.begin(), Indexes.end(), Init,
Reduce, Transform);
}
};
} // namespace mathtest
#endif // MATHTEST_HOSTREFCHECKER_HPP
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