85 lines · cpp
1//===-- Unittests for atan ------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/__support/FPUtil/FPBits.h"10#include "src/math/atan.h"11#include "test/UnitTest/FPMatcher.h"12#include "test/UnitTest/Test.h"13#include "utils/MPFRWrapper/MPFRUtils.h"14 15using LlvmLibcAtanTest = LIBC_NAMESPACE::testing::FPTest<double>;16 17namespace mpfr = LIBC_NAMESPACE::testing::mpfr;18 19using LIBC_NAMESPACE::testing::tlog;20 21TEST_F(LlvmLibcAtanTest, InDoubleRange) {22 constexpr uint64_t COUNT = 123'451;23 uint64_t START = LIBC_NAMESPACE::fputil::FPBits<double>(0x1.0p-60).uintval();24 uint64_t STOP = LIBC_NAMESPACE::fputil::FPBits<double>(0x1.0p60).uintval();25 uint64_t STEP = (STOP - START) / COUNT;26 27 auto test = [&](mpfr::RoundingMode rounding_mode) {28 mpfr::ForceRoundingMode __r(rounding_mode);29 if (!__r.success)30 return;31 32 uint64_t fails = 0;33 uint64_t count = 0;34 uint64_t cc = 0;35 double mx, mr = 0.0;36 double tol = 0.5;37 38 for (uint64_t i = 0, v = START; i <= COUNT; ++i, v += STEP) {39 double x = FPBits(v).get_val();40 if (FPBits(v).is_nan() || FPBits(v).is_inf())41 continue;42 libc_errno = 0;43 double result = LIBC_NAMESPACE::atan(x);44 ++cc;45 if (FPBits(result).is_nan() || FPBits(result).is_inf())46 continue;47 48 ++count;49 50 if (!TEST_MPFR_MATCH_ROUNDING_SILENTLY(mpfr::Operation::Atan, x, result,51 2.0, rounding_mode)) {52 ++fails;53 while (!TEST_MPFR_MATCH_ROUNDING_SILENTLY(mpfr::Operation::Atan, x,54 result, tol, rounding_mode)) {55 mx = x;56 mr = result;57 58 if (tol > 1000.0)59 break;60 61 tol *= 2.0;62 }63 }64 }65 if (fails) {66 tlog << " Atan failed: " << fails << "/" << count << "/" << cc67 << " tests.\n";68 tlog << " Max ULPs is at most: " << static_cast<uint64_t>(tol) << ".\n";69 EXPECT_MPFR_MATCH(mpfr::Operation::Atan, mx, mr, 0.5, rounding_mode);70 }71 };72 73 tlog << " Test Rounding To Nearest...\n";74 test(mpfr::RoundingMode::Nearest);75 76 tlog << " Test Rounding Downward...\n";77 test(mpfr::RoundingMode::Downward);78 79 tlog << " Test Rounding Upward...\n";80 test(mpfr::RoundingMode::Upward);81 82 tlog << " Test Rounding Toward Zero...\n";83 test(mpfr::RoundingMode::TowardZero);84}85