126 lines · cpp
1//===-- Unittests for exp2f -----------------------------------------------===//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/libc_errno.h"13#include "src/__support/macros/optimization.h"14#include "src/math/exp2f.h"15#include "test/UnitTest/FPMatcher.h"16#include "test/UnitTest/Test.h"17#include "utils/MPFRWrapper/MPFRUtils.h"18 19#ifdef LIBC_MATH_HAS_SKIP_ACCURATE_PASS20#define TOLERANCE 121#else22#define TOLERANCE 023#endif // LIBC_MATH_HAS_SKIP_ACCURATE_PASS24 25using LlvmLibcExp2fTest = LIBC_NAMESPACE::testing::FPTest<float>;26 27namespace mpfr = LIBC_NAMESPACE::testing::mpfr;28 29TEST_F(LlvmLibcExp2fTest, SpecialNumbers) {30 EXPECT_FP_EQ(aNaN, LIBC_NAMESPACE::exp2f(aNaN));31 EXPECT_MATH_ERRNO(0);32 33 EXPECT_FP_EQ(inf, LIBC_NAMESPACE::exp2f(inf));34 EXPECT_MATH_ERRNO(0);35 36 EXPECT_FP_EQ(0.0f, LIBC_NAMESPACE::exp2f(neg_inf));37 EXPECT_MATH_ERRNO(0);38 39 EXPECT_FP_EQ(1.0f, LIBC_NAMESPACE::exp2f(0.0f));40 EXPECT_MATH_ERRNO(0);41 42 EXPECT_FP_EQ(1.0f, LIBC_NAMESPACE::exp2f(-0.0f));43 EXPECT_MATH_ERRNO(0);44}45 46TEST_F(LlvmLibcExp2fTest, Overflow) {47 EXPECT_FP_EQ_WITH_EXCEPTION(48 inf, LIBC_NAMESPACE::exp2f(FPBits(0x7f7fffffU).get_val()), FE_OVERFLOW);49 EXPECT_MATH_ERRNO(ERANGE);50 51 EXPECT_FP_EQ_WITH_EXCEPTION(52 inf, LIBC_NAMESPACE::exp2f(FPBits(0x43000000U).get_val()), FE_OVERFLOW);53 EXPECT_MATH_ERRNO(ERANGE);54 55 EXPECT_FP_EQ_WITH_EXCEPTION(56 inf, LIBC_NAMESPACE::exp2f(FPBits(0x43000001U).get_val()), FE_OVERFLOW);57 EXPECT_MATH_ERRNO(ERANGE);58}59 60TEST_F(LlvmLibcExp2fTest, TrickyInputs) {61 constexpr int N = 12;62 constexpr uint32_t INPUTS[N] = {63 0x3b429d37U, /*0x1.853a6ep-9f*/64 0x3c02a9adU, /*0x1.05535ap-7f*/65 0x3ca66e26U, /*0x1.4cdc4cp-6f*/66 0x3d92a282U, /*0x1.254504p-4f*/67 0x42fa0001U, /*0x1.f40002p+6f*/68 0x42ffffffU, /*0x1.fffffep+6f*/69 0xb8d3d026U, /*-0x1.a7a04cp-14f*/70 0xbcf3a937U, /*-0x1.e7526ep-6f*/71 0xc2fa0001U, /*-0x1.f40002p+6f*/72 0xc2fc0000U, /*-0x1.f8p+6f*/73 0xc2fc0001U, /*-0x1.f80002p+6f*/74 0xc3150000U, /*-0x1.2ap+7f*/75 };76 for (int i = 0; i < N; ++i) {77 libc_errno = 0;78 float x = FPBits(INPUTS[i]).get_val();79 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2, x,80 LIBC_NAMESPACE::exp2f(x), TOLERANCE + 0.5);81 EXPECT_MATH_ERRNO(0);82 }83}84 85TEST_F(LlvmLibcExp2fTest, Underflow) {86 EXPECT_FP_EQ_WITH_EXCEPTION(87 0.0f, LIBC_NAMESPACE::exp2f(FPBits(0xff7fffffU).get_val()), FE_UNDERFLOW);88 EXPECT_MATH_ERRNO(ERANGE);89 90 float x = FPBits(0xc3158000U).get_val();91 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2, x,92 LIBC_NAMESPACE::exp2f(x), 0.5);93 EXPECT_MATH_ERRNO(0);94 95 x = FPBits(0xc3160000U).get_val();96 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2, x,97 LIBC_NAMESPACE::exp2f(x), 0.5);98 EXPECT_MATH_ERRNO(ERANGE);99 100 x = FPBits(0xc3165432U).get_val();101 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2, x,102 LIBC_NAMESPACE::exp2f(x), 0.5);103 EXPECT_MATH_ERRNO(ERANGE);104}105 106TEST_F(LlvmLibcExp2fTest, InFloatRange) {107 constexpr uint32_t COUNT = 100'000;108 constexpr uint32_t STEP = UINT32_MAX / COUNT;109 for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) {110 float x = FPBits(v).get_val();111 if (FPBits(v).is_nan() || FPBits(v).is_inf())112 continue;113 libc_errno = 0;114 float result = LIBC_NAMESPACE::exp2f(x);115 116 // If the computation resulted in an error or did not produce valid result117 // in the single-precision floating point range, then ignore comparing with118 // MPFR result as MPFR can still produce valid results because of its119 // wider precision.120 if (FPBits(result).is_nan() || FPBits(result).is_inf() || libc_errno != 0)121 continue;122 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2, x,123 LIBC_NAMESPACE::exp2f(x), 0.5);124 }125}126