| //===-- Utility class to test integer sqrt ----------------------*- C++ -*-===// |
| // |
| // 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 "test/UnitTest/FPMatcher.h" |
| #include "test/UnitTest/Test.h" |
| |
| #include "src/__support/CPP/bit.h" |
| #include "src/__support/FPUtil/BasicOperations.h" |
| #include "src/__support/fixed_point/fx_rep.h" |
| #include "src/__support/fixed_point/sqrt.h" |
| |
| #include "src/math/exp.h" |
| |
| template <typename T> class ExpTest : public LIBC_NAMESPACE::testing::Test { |
| |
| using FXRep = LIBC_NAMESPACE::fixed_point::FXRep<T>; |
| static constexpr T zero = FXRep::ZERO(); |
| static constexpr T one = static_cast<T>(1); |
| static constexpr T eps = FXRep::EPS(); |
| |
| public: |
| typedef T (*ExpFunc)(T); |
| |
| void test_special_numbers(ExpFunc func) { |
| EXPECT_EQ(one, func(T(0))); |
| EXPECT_EQ(FXRep::MAX(), func(T(30))); |
| EXPECT_EQ(zero, func(T(-30))); |
| } |
| |
| void test_range_with_step(ExpFunc func, T step, bool rel_error) { |
| constexpr int COUNT = 255; |
| constexpr double ERR = 3.0 * static_cast<double>(eps); |
| double x_d = 0.0; |
| T x = step; |
| for (int i = 0; i < COUNT; ++i) { |
| x += step; |
| x_d = static_cast<double>(x); |
| double y_d = static_cast<double>(func(x)); |
| double result = LIBC_NAMESPACE::exp(x_d); |
| double errors = rel_error |
| ? LIBC_NAMESPACE::fputil::abs((y_d / result) - 1.0) |
| : LIBC_NAMESPACE::fputil::abs(y_d - result); |
| if (errors > ERR) { |
| // Print out the failure input and output. |
| EXPECT_EQ(x, T(0)); |
| EXPECT_EQ(func(x), zero); |
| } |
| ASSERT_TRUE(errors <= ERR); |
| } |
| } |
| |
| void test_positive_range(ExpFunc func) { |
| test_range_with_step(func, T(0x1.0p-6), /*rel_error*/ true); |
| } |
| |
| void test_negative_range(ExpFunc func) { |
| test_range_with_step(func, T(-0x1.0p-6), /*rel_error*/ false); |
| } |
| }; |
| |
| #define LIST_EXP_TESTS(Name, T, func) \ |
| using LlvmLibcExp##Name##Test = ExpTest<T>; \ |
| TEST_F(LlvmLibcExp##Name##Test, SpecialNumbers) { \ |
| test_special_numbers(&func); \ |
| } \ |
| TEST_F(LlvmLibcExp##Name##Test, PositiveRange) { \ |
| test_positive_range(&func); \ |
| } \ |
| TEST_F(LlvmLibcExp##Name##Test, NegativeRange) { \ |
| test_negative_range(&func); \ |
| } \ |
| static_assert(true, "Require semicolon.") |