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//===-- Common utility class for differential analysis --------------------===//
//
// 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 "src/__support/CPP/algorithm.h"
#include "src/__support/FPUtil/FPBits.h"
#include "src/__support/macros/config.h"
#include "test/src/math/performance_testing/Timer.h"
#include <cstddef>
#include <fstream>
namespace LIBC_NAMESPACE_DECL {
namespace testing {
template <typename OutputType, typename InputType> class PerfTest {
using FPBits = fputil::FPBits<OutputType>;
using StorageType = typename FPBits::StorageType;
static constexpr StorageType U_INT_MAX =
cpp::numeric_limits<StorageType>::max();
public:
using BinaryFuncPtr = OutputType (*)(InputType, InputType);
using UnaryFuncPtr = OutputType (*)(InputType);
template <bool binary, typename Func>
static void run_perf_in_range(Func FuncA, Func FuncB, StorageType startingBit,
StorageType endingBit, size_t N, size_t rounds,
const char *name_a, const char *name_b,
std::ofstream &log) {
if (sizeof(StorageType) <= sizeof(size_t))
N = cpp::min(N, static_cast<size_t>(endingBit - startingBit));
auto runner = [=](Func func) {
[[maybe_unused]] volatile OutputType result;
if (endingBit < startingBit) {
return;
}
StorageType step = (endingBit - startingBit) / N;
if (step == 0)
step = 1;
for (size_t i = 0; i < rounds; i++) {
for (StorageType bits_x = startingBit, bits_y = endingBit;;
bits_x += step, bits_y -= step) {
InputType x = FPBits(bits_x).get_val();
if constexpr (binary) {
InputType y = FPBits(bits_y).get_val();
result = func(x, y);
} else {
result = func(x);
}
if (endingBit - bits_x < step) {
break;
}
}
}
};
Timer timer;
timer.start();
runner(FuncA);
timer.stop();
double a_average = static_cast<double>(timer.nanoseconds()) / N / rounds;
log << "-- Function A: " << name_a << " --\n";
log << " Total time : " << timer.nanoseconds() << " ns \n";
log << " Average runtime : " << a_average << " ns/op \n";
log << " Ops per second : "
<< static_cast<uint64_t>(1'000'000'000.0 / a_average) << " op/s \n";
timer.start();
runner(FuncB);
timer.stop();
double b_average = static_cast<double>(timer.nanoseconds()) / N / rounds;
log << "-- Function B: " << name_b << " --\n";
log << " Total time : " << timer.nanoseconds() << " ns \n";
log << " Average runtime : " << b_average << " ns/op \n";
log << " Ops per second : "
<< static_cast<uint64_t>(1'000'000'000.0 / b_average) << " op/s \n";
log << "-- Average ops per second ratio --\n";
log << " A / B : " << b_average / a_average << " \n";
}
template <bool binary, typename Func>
static void run_perf(Func FuncA, Func FuncB, int rounds, const char *name_a,
const char *name_b, const char *logFile) {
std::ofstream log(logFile);
log << " Performance tests with inputs in denormal range:\n";
run_perf_in_range<binary>(
FuncA, FuncB, /* startingBit= */ StorageType(0),
/* endingBit= */ FPBits::max_subnormal().uintval(), 1'000'001, rounds,
name_a, name_b, log);
log << "\n Performance tests with inputs in normal range:\n";
run_perf_in_range<binary>(FuncA, FuncB,
/* startingBit= */ FPBits::min_normal().uintval(),
/* endingBit= */ FPBits::max_normal().uintval(),
1'000'001, rounds, name_a, name_b, log);
log << "\n Performance tests with inputs in normal range with exponents "
"close to each other:\n";
run_perf_in_range<binary>(
FuncA, FuncB,
/* startingBit= */ FPBits(OutputType(0x1.0p-10)).uintval(),
/* endingBit= */ FPBits(OutputType(0x1.0p+10)).uintval(), 1'000'001,
rounds, name_a, name_b, log);
}
};
} // namespace testing
} // namespace LIBC_NAMESPACE_DECL
#define BINARY_INPUT_SINGLE_OUTPUT_PERF(OutputType, InputType, FuncA, FuncB, \
filename) \
{ \
using TargetFuncPtr = \
typename LIBC_NAMESPACE::testing::PerfTest<OutputType, \
InputType>::BinaryFuncPtr; \
LIBC_NAMESPACE::testing::PerfTest<OutputType, InputType>::run_perf<true>( \
static_cast<TargetFuncPtr>(&FuncA), \
static_cast<TargetFuncPtr>(&FuncB), 1, #FuncA, #FuncB, filename); \
return 0; \
}
#define BINARY_INPUT_SINGLE_OUTPUT_PERF_EX(OutputType, InputType, FuncA, \
FuncB, rounds, filename) \
{ \
using TargetFuncPtr = \
typename LIBC_NAMESPACE::testing::PerfTest<OutputType, \
InputType>::BinaryFuncPtr; \
LIBC_NAMESPACE::testing::PerfTest<OutputType, InputType>::run_perf<true>( \
static_cast<TargetFuncPtr>(&FuncA), \
static_cast<TargetFuncPtr>(&FuncB), rounds, #FuncA, #FuncB, filename); \
return 0; \
}
#define SINGLE_INPUT_SINGLE_OUTPUT_PERF(T, FuncA, FuncB, filename) \
{ \
using TargetFuncPtr = \
typename LIBC_NAMESPACE::testing::PerfTest<T, T>::UnaryFuncPtr; \
LIBC_NAMESPACE::testing::PerfTest<T, T>::run_perf<false>( \
static_cast<TargetFuncPtr>(&FuncA), \
static_cast<TargetFuncPtr>(&FuncB), 1, #FuncA, #FuncB, filename); \
return 0; \
}
#define SINGLE_INPUT_SINGLE_OUTPUT_PERF_EX(T, FuncA, FuncB, rounds, filename) \
{ \
using TargetFuncPtr = \
typename LIBC_NAMESPACE::testing::PerfTest<T, T>::UnaryFuncPtr; \
LIBC_NAMESPACE::testing::PerfTest<T, T>::run_perf<false>( \
static_cast<TargetFuncPtr>(&FuncA), \
static_cast<TargetFuncPtr>(&FuncB), rounds, #FuncA, #FuncB, filename); \
return 0; \
}
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