112 lines · cpp
1//===-- Unittests for erff ------------------------------------------------===//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 "hdr/math_macros.h"10#include "hdr/stdint_proxy.h"11#include "src/__support/FPUtil/FPBits.h"12#include "src/__support/macros/optimization.h"13#include "src/math/erff.h"14#include "test/UnitTest/FPMatcher.h"15#include "test/UnitTest/Test.h"16#include "utils/MPFRWrapper/MPFRUtils.h"17 18#ifdef LIBC_MATH_HAS_SKIP_ACCURATE_PASS19#define TOLERANCE 120#else21#define TOLERANCE 022#endif // LIBC_MATH_HAS_SKIP_ACCURATE_PASS23 24using LlvmLibcErffTest = LIBC_NAMESPACE::testing::FPTest<float>;25 26namespace mpfr = LIBC_NAMESPACE::testing::mpfr;27using LIBC_NAMESPACE::testing::tlog;28 29TEST_F(LlvmLibcErffTest, SpecialNumbers) {30 EXPECT_FP_EQ_ALL_ROUNDING(aNaN, LIBC_NAMESPACE::erff(aNaN));31 EXPECT_FP_EQ_ALL_ROUNDING(1.0f, LIBC_NAMESPACE::erff(inf));32 EXPECT_FP_EQ_ALL_ROUNDING(-1.0f, LIBC_NAMESPACE::erff(neg_inf));33 EXPECT_FP_EQ_ALL_ROUNDING(zero, LIBC_NAMESPACE::erff(zero));34 EXPECT_FP_EQ_ALL_ROUNDING(neg_zero, LIBC_NAMESPACE::erff(neg_zero));35}36 37TEST_F(LlvmLibcErffTest, TrickyInputs) {38 constexpr int N = 2;39 constexpr uint32_t INPUTS[N] = {40 0x3f65'9229U, // |x| = 0x1.cb2452p-1f41 0x4004'1e6aU, // |x| = 0x1.083cd4p+1f42 };43 for (int i = 0; i < N; ++i) {44 float x = FPBits(INPUTS[i]).get_val();45 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Erf, x,46 LIBC_NAMESPACE::erff(x), TOLERANCE + 0.5);47 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Erf, -x,48 LIBC_NAMESPACE::erff(-x), TOLERANCE + 0.5);49 }50}51 52TEST_F(LlvmLibcErffTest, InFloatRange) {53 constexpr uint32_t COUNT = 234561;54 constexpr uint32_t START = 0; // 055 constexpr uint32_t STOP = 0x4080'0000U; // 4.0f56 57 constexpr uint64_t STEP = (STOP - START) / COUNT;58 59 auto test = [&](mpfr::RoundingMode rounding_mode) {60 mpfr::ForceRoundingMode __r(rounding_mode);61 if (!__r.success)62 return;63 64 uint32_t fails = 0;65 uint32_t count = 0;66 uint32_t cc = 0;67 float mx, mr = 0.0;68 double tol = 0.5;69 70 for (uint32_t i = 0, v = START; i <= COUNT; ++i, v += STEP) {71 float x = FPBits(v).get_val();72 if (FPBits(v).is_nan())73 continue;74 75 float result = LIBC_NAMESPACE::erff(x);76 ++cc;77 if (FPBits(result).is_nan())78 continue;79 80 ++count;81 if (!TEST_MPFR_MATCH_ROUNDING_SILENTLY(mpfr::Operation::Erf, x, result,82 0.5, rounding_mode)) {83 ++fails;84 while (!TEST_MPFR_MATCH_ROUNDING_SILENTLY(mpfr::Operation::Erf, x,85 result, tol, rounding_mode)) {86 mx = x;87 mr = result;88 tol *= 2.0;89 }90 }91 }92 if (fails) {93 tlog << " Log failed: " << fails << "/" << count << "/" << cc94 << " tests.\n";95 tlog << " Max ULPs is at most: " << static_cast<uint64_t>(tol) << ".\n";96 EXPECT_MPFR_MATCH(mpfr::Operation::Erf, mx, mr, 0.5, rounding_mode);97 }98 };99 100 tlog << " Test Rounding To Nearest...\n";101 test(mpfr::RoundingMode::Nearest);102 103 tlog << " Test Rounding Downward...\n";104 test(mpfr::RoundingMode::Downward);105 106 tlog << " Test Rounding Upward...\n";107 test(mpfr::RoundingMode::Upward);108 109 tlog << " Test Rounding Toward Zero...\n";110 test(mpfr::RoundingMode::TowardZero);111}112