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//===-- Unittests for erff ------------------------------------------------===//
//
// 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/erff.h"
#include "test/UnitTest/FPMatcher.h"
#include "test/UnitTest/Test.h"
#include "utils/MPFRWrapper/MPFRUtils.h"
#include <math.h>
#include <errno.h>
#include <stdint.h>
using LlvmLibcErffTest = LIBC_NAMESPACE::testing::FPTest<float>;
namespace mpfr = LIBC_NAMESPACE::testing::mpfr;
using LIBC_NAMESPACE::testing::tlog;
TEST_F(LlvmLibcErffTest, SpecialNumbers) {
EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::erff(aNaN));
EXPECT_FP_EQ_ALL_ROUNDING(1.0f, LIBC_NAMESPACE::erff(inf));
EXPECT_FP_EQ_ALL_ROUNDING(-1.0f, LIBC_NAMESPACE::erff(neg_inf));
EXPECT_FP_EQ_ALL_ROUNDING(zero, LIBC_NAMESPACE::erff(zero));
EXPECT_FP_EQ_ALL_ROUNDING(neg_zero, LIBC_NAMESPACE::erff(neg_zero));
}
TEST_F(LlvmLibcErffTest, TrickyInputs) {
constexpr int N = 2;
constexpr uint32_t INPUTS[N] = {
0x3f65'9229U, // |x| = 0x1.cb2452p-1f
0x4004'1e6aU, // |x| = 0x1.083cd4p+1f
};
for (int i = 0; i < N; ++i) {
float x = FPBits(INPUTS[i]).get_val();
EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Erf, x,
LIBC_NAMESPACE::erff(x), 0.5);
EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Erf, -x,
LIBC_NAMESPACE::erff(-x), 0.5);
}
}
TEST_F(LlvmLibcErffTest, InFloatRange) {
constexpr uint32_t COUNT = 234561;
constexpr uint32_t START = 0; // 0
constexpr uint32_t STOP = 0x4080'0000U; // 4.0f
constexpr uint64_t STEP = (STOP - START) / COUNT;
auto test = [&](mpfr::RoundingMode rounding_mode) {
mpfr::ForceRoundingMode __r(rounding_mode);
if (!__r.success)
return;
uint32_t fails = 0;
uint32_t count = 0;
uint32_t cc = 0;
float mx, mr = 0.0;
double tol = 0.5;
for (uint32_t i = 0, v = START; i <= COUNT; ++i, v += STEP) {
float x = FPBits(v).get_val();
if (isnan(x))
continue;
float result = LIBC_NAMESPACE::erff(x);
++cc;
if (isnan(result))
continue;
++count;
if (!TEST_MPFR_MATCH_ROUNDING_SILENTLY(mpfr::Operation::Erf, x, result,
0.5, rounding_mode)) {
++fails;
while (!TEST_MPFR_MATCH_ROUNDING_SILENTLY(mpfr::Operation::Erf, x,
result, tol, rounding_mode)) {
mx = x;
mr = result;
tol *= 2.0;
}
}
}
tlog << " Log failed: " << fails << "/" << count << "/" << cc
<< " tests.\n";
tlog << " Max ULPs is at most: " << static_cast<uint64_t>(tol) << ".\n";
if (fails) {
EXPECT_MPFR_MATCH(mpfr::Operation::Erf, mx, mr, 0.5, rounding_mode);
}
};
tlog << " Test Rounding To Nearest...\n";
test(mpfr::RoundingMode::Nearest);
tlog << " Test Rounding Downward...\n";
test(mpfr::RoundingMode::Downward);
tlog << " Test Rounding Upward...\n";
test(mpfr::RoundingMode::Upward);
tlog << " Test Rounding Toward Zero...\n";
test(mpfr::RoundingMode::TowardZero);
}
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