1 //===-- Unittests for exp2m1f ---------------------------------------------===// 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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "hdr/math_macros.h" 10 #include "src/__support/CPP/array.h" 11 #include "src/__support/FPUtil/FPBits.h" 12 #include "src/errno/libc_errno.h" 13 #include "src/math/exp2m1f.h" 14 #include "test/UnitTest/FPMatcher.h" 15 #include "test/UnitTest/Test.h" 16 #include "utils/MPFRWrapper/MPFRUtils.h" 17 18 #include <stdint.h> 19 20 using LlvmLibcExp2m1fTest = LIBC_NAMESPACE::testing::FPTest<float>; 21 22 namespace mpfr = LIBC_NAMESPACE::testing::mpfr; 23 24 TEST_F(LlvmLibcExp2m1fTest, TrickyInputs) { 25 constexpr LIBC_NAMESPACE::cpp::array<float, 10> INPUTS = { 26 // EXP2M1F_EXCEPTS_LO 27 0x1.36dc8ep-36, 28 0x1.224936p-19, 29 0x1.d16d2p-20, 30 0x1.17949ep-14, 31 -0x1.9c3e1ep-38, 32 -0x1.4d89b4p-32, 33 -0x1.a6eac4p-10, 34 -0x1.e7526ep-6, 35 // EXP2M1F_EXCEPTS_HI 36 0x1.16a972p-1, 37 -0x1.9f12acp-5, 38 }; 39 40 for (float x : INPUTS) { 41 LIBC_NAMESPACE::libc_errno = 0; 42 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2m1, x, 43 LIBC_NAMESPACE::exp2m1f(x), 0.5); 44 } 45 } 46 47 TEST_F(LlvmLibcExp2m1fTest, InFloatRange) { 48 constexpr uint32_t COUNT = 100'000; 49 constexpr uint32_t STEP = UINT32_MAX / COUNT; 50 for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) { 51 float x = FPBits(v).get_val(); 52 if (FPBits(v).is_nan() || FPBits(v).is_inf()) 53 continue; 54 LIBC_NAMESPACE::libc_errno = 0; 55 float result = LIBC_NAMESPACE::exp2m1f(x); 56 57 // If the computation resulted in an error or did not produce valid result 58 // in the single-precision floating point range, then ignore comparing with 59 // MPFR result as MPFR can still produce valid results because of its 60 // wider precision. 61 if (FPBits(result).is_nan() || FPBits(result).is_inf() || 62 LIBC_NAMESPACE::libc_errno != 0) 63 continue; 64 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2m1, x, 65 LIBC_NAMESPACE::exp2m1f(x), 0.5); 66 } 67 } 68