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//===-- Performance test for nearest integer functions --------------------===//
//
// 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/FPUtil/FPBits.h"
#include "src/math/ceilf.h"
#include "src/math/ceilf16.h"
#include "src/math/floorf.h"
#include "src/math/floorf16.h"
#include "src/math/rintf.h"
#include "src/math/rintf16.h"
#include "src/math/roundevenf.h"
#include "src/math/roundevenf16.h"
#include "src/math/roundf.h"
#include "src/math/roundf16.h"
#include "src/math/truncf.h"
#include "src/math/truncf16.h"
#include "test/UnitTest/RoundingModeUtils.h"
#include "test/src/math/performance_testing/Timer.h"
#include <fstream>
#include <math.h>
using LIBC_NAMESPACE::fputil::testing::ForceRoundingMode;
using LIBC_NAMESPACE::fputil::testing::RoundingMode;
namespace LIBC_NAMESPACE::testing {
template <typename T> class NearestIntegerPerf {
using FPBits = fputil::FPBits<T>;
using StorageType = typename FPBits::StorageType;
public:
typedef T Func(T);
static void run_perf_in_range(Func my_func, Func other_func,
StorageType starting_bit,
StorageType ending_bit, StorageType step,
size_t rounds, const char *name_a,
const char *name_b, std::ofstream &log) {
auto runner = [=](Func func) {
[[maybe_unused]] volatile T result;
for (size_t i = 0; i < rounds; i++) {
for (StorageType bits = starting_bit; bits <= ending_bit;
bits += step) {
T x = FPBits(bits).get_val();
result = func(x);
}
}
};
Timer timer;
timer.start();
runner(my_func);
timer.stop();
size_t number_of_runs = (ending_bit - starting_bit) / step + 1;
double my_average =
static_cast<double>(timer.nanoseconds()) / number_of_runs / rounds;
log << "-- Function A: " << name_a << " --\n";
log << " Total time : " << timer.nanoseconds() << " ns \n";
log << " Average runtime : " << my_average << " ns/op \n";
log << " Ops per second : "
<< static_cast<uint64_t>(1'000'000'000.0 / my_average) << " op/s \n";
timer.start();
runner(other_func);
timer.stop();
double other_average =
static_cast<double>(timer.nanoseconds()) / number_of_runs / rounds;
log << "-- Function B: " << name_b << " --\n";
log << " Total time : " << timer.nanoseconds() << " ns \n";
log << " Average runtime : " << other_average << " ns/op \n";
log << " Ops per second : "
<< static_cast<uint64_t>(1'000'000'000.0 / other_average) << " op/s \n";
log << "-- Average ops per second ratio --\n";
log << " A / B : " << other_average / my_average << " \n";
}
static void run_perf(Func my_func, Func other_func, size_t rounds,
const char *name_a, const char *name_b,
const char *log_file) {
std::ofstream log(log_file);
log << "Performance tests with inputs in normal integral range:\n";
run_perf_in_range(
my_func, other_func,
/*starting_bit=*/StorageType((FPBits::EXP_BIAS + 1) << FPBits::SIG_LEN),
/*ending_bit=*/
StorageType((FPBits::EXP_BIAS + FPBits::FRACTION_LEN - 1)
<< FPBits::SIG_LEN),
/*step=*/StorageType(1 << FPBits::SIG_LEN),
rounds * FPBits::EXP_BIAS * FPBits::EXP_BIAS * 2, name_a, name_b, log);
log << "\n Performance tests with inputs in low integral range:\n";
run_perf_in_range(
my_func, other_func,
/*starting_bit=*/StorageType(1 << FPBits::SIG_LEN),
/*ending_bit=*/StorageType((FPBits::EXP_BIAS - 1) << FPBits::SIG_LEN),
/*step_bit=*/StorageType(1 << FPBits::SIG_LEN),
rounds * FPBits::EXP_BIAS * FPBits::EXP_BIAS * 2, name_a, name_b, log);
log << "\n Performance tests with inputs in high integral range:\n";
run_perf_in_range(
my_func, other_func,
/*starting_bit=*/
StorageType((FPBits::EXP_BIAS + FPBits::FRACTION_LEN)
<< FPBits::SIG_LEN),
/*ending_bit=*/
StorageType(FPBits::MAX_BIASED_EXPONENT << FPBits::SIG_LEN),
/*step=*/StorageType(1 << FPBits::SIG_LEN),
rounds * FPBits::EXP_BIAS * FPBits::EXP_BIAS * 2, name_a, name_b, log);
log << "\n Performance tests with inputs in normal fractional range:\n";
run_perf_in_range(
my_func, other_func,
/*starting_bit=*/
StorageType(((FPBits::EXP_BIAS + 1) << FPBits::SIG_LEN) + 1),
/*ending_bit=*/
StorageType(((FPBits::EXP_BIAS + 2) << FPBits::SIG_LEN) - 1),
/*step=*/StorageType(1), rounds * 2, name_a, name_b, log);
log << "\n Performance tests with inputs in subnormal fractional range:\n";
run_perf_in_range(my_func, other_func, /*starting_bit=*/StorageType(1),
/*ending_bit=*/StorageType(FPBits::SIG_MASK),
/*step=*/StorageType(1), rounds, name_a, name_b, log);
}
};
} // namespace LIBC_NAMESPACE::testing
#define NEAREST_INTEGER_PERF(T, my_func, other_func, rounds, filename) \
{ \
LIBC_NAMESPACE::testing::NearestIntegerPerf<T>::run_perf( \
&my_func, &other_func, rounds, #my_func, #other_func, filename); \
}
static constexpr size_t FLOAT16_ROUNDS = 20'000;
static constexpr size_t FLOAT_ROUNDS = 40;
// LLVM libc might be the only libc implementation with support for float16 math
// functions currently. We can't compare our float16 functions against the
// system libc, so we compare them against this placeholder function.
float16 placeholderf16(float16 x) { return x; }
// The system libc might not provide the roundeven* C23 math functions either.
float placeholderf(float x) { return x; }
int main() {
NEAREST_INTEGER_PERF(float16, LIBC_NAMESPACE::ceilf16, ::placeholderf16,
FLOAT16_ROUNDS, "ceilf16_perf.log")
NEAREST_INTEGER_PERF(float16, LIBC_NAMESPACE::floorf16, ::placeholderf16,
FLOAT16_ROUNDS, "floorf16_perf.log")
NEAREST_INTEGER_PERF(float16, LIBC_NAMESPACE::roundf16, ::placeholderf16,
FLOAT16_ROUNDS, "roundf16_perf.log")
NEAREST_INTEGER_PERF(float16, LIBC_NAMESPACE::roundevenf16, ::placeholderf16,
FLOAT16_ROUNDS, "roundevenf16_perf.log")
NEAREST_INTEGER_PERF(float16, LIBC_NAMESPACE::truncf16, ::placeholderf16,
FLOAT16_ROUNDS, "truncf16_perf.log")
NEAREST_INTEGER_PERF(float, LIBC_NAMESPACE::ceilf, ::ceilf, FLOAT_ROUNDS,
"ceilf_perf.log")
NEAREST_INTEGER_PERF(float, LIBC_NAMESPACE::floorf, ::floorf, FLOAT_ROUNDS,
"floorf_perf.log")
NEAREST_INTEGER_PERF(float, LIBC_NAMESPACE::roundf, ::roundf, FLOAT_ROUNDS,
"roundf_perf.log")
NEAREST_INTEGER_PERF(float, LIBC_NAMESPACE::roundevenf, ::placeholderf,
FLOAT_ROUNDS, "roundevenf_perf.log")
NEAREST_INTEGER_PERF(float, LIBC_NAMESPACE::truncf, ::truncf, FLOAT_ROUNDS,
"truncf_perf.log")
if (ForceRoundingMode r(RoundingMode::Upward); r.success) {
NEAREST_INTEGER_PERF(float16, LIBC_NAMESPACE::rintf16, ::placeholderf16,
FLOAT16_ROUNDS, "rintf16_upward_perf.log")
NEAREST_INTEGER_PERF(float, LIBC_NAMESPACE::rintf, ::rintf, FLOAT_ROUNDS,
"rintf_upward_perf.log")
}
if (ForceRoundingMode r(RoundingMode::Downward); r.success) {
NEAREST_INTEGER_PERF(float16, LIBC_NAMESPACE::rintf16, ::placeholderf16,
FLOAT16_ROUNDS, "rintf16_downward_perf.log")
NEAREST_INTEGER_PERF(float, LIBC_NAMESPACE::rintf, ::rintf, FLOAT_ROUNDS,
"rintf_downward_perf.log")
}
if (ForceRoundingMode r(RoundingMode::TowardZero); r.success) {
NEAREST_INTEGER_PERF(float16, LIBC_NAMESPACE::rintf16, ::placeholderf16,
FLOAT16_ROUNDS, "rintf16_towardzero_perf.log")
NEAREST_INTEGER_PERF(float, LIBC_NAMESPACE::rintf, ::rintf, FLOAT_ROUNDS,
"rintf_towardzero_perf.log")
}
if (ForceRoundingMode r(RoundingMode::Nearest); r.success) {
NEAREST_INTEGER_PERF(float16, LIBC_NAMESPACE::rintf16, ::placeholderf16,
FLOAT16_ROUNDS, "rintf16_nearest_perf.log")
NEAREST_INTEGER_PERF(float, LIBC_NAMESPACE::rintf, ::rintf, FLOAT_ROUNDS,
"rintf_nearest_perf.log")
}
return 0;
}
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