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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "src/__support/FPUtil/FPBits.h" 10 #include "src/math/exp2f.h" 11 #include "utils/MPFRWrapper/MPFRUtils.h" 12 #include "utils/UnitTest/FPMatcher.h" 13 #include "utils/UnitTest/Test.h" 14 #include <math.h> 15 16 #include <errno.h> 17 #include <stdint.h> 18 19 namespace mpfr = __llvm_libc::testing::mpfr; 20 21 DECLARE_SPECIAL_CONSTANTS(float) 22 23 TEST(LlvmLibcExp2fTest, SpecialNumbers) { 24 errno = 0; 25 26 EXPECT_FP_EQ(aNaN, __llvm_libc::exp2f(aNaN)); 27 EXPECT_MATH_ERRNO(0); 28 29 EXPECT_FP_EQ(inf, __llvm_libc::exp2f(inf)); 30 EXPECT_MATH_ERRNO(0); 31 32 EXPECT_FP_EQ(0.0f, __llvm_libc::exp2f(neg_inf)); 33 EXPECT_MATH_ERRNO(0); 34 35 EXPECT_FP_EQ(1.0f, __llvm_libc::exp2f(0.0f)); 36 EXPECT_MATH_ERRNO(0); 37 38 EXPECT_FP_EQ(1.0f, __llvm_libc::exp2f(-0.0f)); 39 EXPECT_MATH_ERRNO(0); 40 } 41 42 TEST(LlvmLibcExp2fTest, Overflow) { 43 errno = 0; 44 EXPECT_FP_EQ(inf, __llvm_libc::exp2f(float(FPBits(0x7f7fffffU)))); 45 EXPECT_MATH_ERRNO(ERANGE); 46 47 EXPECT_FP_EQ(inf, __llvm_libc::exp2f(float(FPBits(0x43000000U)))); 48 EXPECT_MATH_ERRNO(ERANGE); 49 50 EXPECT_FP_EQ(inf, __llvm_libc::exp2f(float(FPBits(0x43000001U)))); 51 EXPECT_MATH_ERRNO(ERANGE); 52 } 53 54 TEST(LlvmLibcExp2fTest, TrickyInputs) { 55 constexpr int N = 12; 56 constexpr uint32_t INPUTS[N] = { 57 0x3b429d37U, /*0x1.853a6ep-9f*/ 58 0x3c02a9adU, /*0x1.05535ap-7f*/ 59 0x3ca66e26U, /*0x1.4cdc4cp-6f*/ 60 0x3d92a282U, /*0x1.254504p-4f*/ 61 0x42fa0001U, /*0x1.f40002p+6f*/ 62 0x42ffffffU, /*0x1.fffffep+6f*/ 63 0xb8d3d026U, /*-0x1.a7a04cp-14f*/ 64 0xbcf3a937U, /*-0x1.e7526ep-6f*/ 65 0xc2fa0001U, /*-0x1.f40002p+6f*/ 66 0xc2fc0000U, /*-0x1.f8p+6f*/ 67 0xc2fc0001U, /*-0x1.f80002p+6f*/ 68 0xc3150000U, /*-0x1.2ap+7f*/ 69 }; 70 for (int i = 0; i < N; ++i) { 71 errno = 0; 72 float x = float(FPBits(INPUTS[i])); 73 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2, x, 74 __llvm_libc::exp2f(x), 0.5); 75 EXPECT_MATH_ERRNO(0); 76 } 77 } 78 79 TEST(LlvmLibcExp2fTest, Underflow) { 80 errno = 0; 81 EXPECT_FP_EQ(0.0f, __llvm_libc::exp2f(float(FPBits(0xff7fffffU)))); 82 EXPECT_MATH_ERRNO(ERANGE); 83 84 float x = float(FPBits(0xc3158000U)); 85 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2, x, 86 __llvm_libc::exp2f(x), 0.5); 87 EXPECT_MATH_ERRNO(0); 88 89 x = float(FPBits(0xc3160000U)); 90 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2, x, 91 __llvm_libc::exp2f(x), 0.5); 92 EXPECT_MATH_ERRNO(ERANGE); 93 94 x = float(FPBits(0xc3165432U)); 95 EXPECT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2, x, 96 __llvm_libc::exp2f(x), 0.5); 97 EXPECT_MATH_ERRNO(ERANGE); 98 } 99 100 TEST(LlvmLibcExp2fTest, InFloatRange) { 101 constexpr uint32_t COUNT = 1000000; 102 constexpr uint32_t STEP = UINT32_MAX / COUNT; 103 for (uint32_t i = 0, v = 0; i <= COUNT; ++i, v += STEP) { 104 float x = float(FPBits(v)); 105 if (isnan(x) || isinf(x)) 106 continue; 107 errno = 0; 108 float result = __llvm_libc::exp2f(x); 109 110 // If the computation resulted in an error or did not produce valid result 111 // in the single-precision floating point range, then ignore comparing with 112 // MPFR result as MPFR can still produce valid results because of its 113 // wider precision. 114 if (isnan(result) || isinf(result) || errno != 0) 115 continue; 116 ASSERT_MPFR_MATCH_ALL_ROUNDING(mpfr::Operation::Exp2, x, 117 __llvm_libc::exp2f(x), 0.5); 118 } 119 } 120