1 //===-- Unittests for frexpl ----------------------------------------------===// 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 "include/math.h" 10 #include "src/math/frexpl.h" 11 #include "utils/FPUtil/BasicOperations.h" 12 #include "utils/FPUtil/FPBits.h" 13 #include "utils/UnitTest/Test.h" 14 15 using FPBits = __llvm_libc::fputil::FPBits<long double>; 16 17 TEST(FrexplTest, SpecialNumbers) { 18 int exponent; 19 20 EXPECT_TRUE(FPBits::inf() == __llvm_libc::frexpl(FPBits::inf(), &exponent)); 21 EXPECT_TRUE(FPBits::negInf() == 22 __llvm_libc::frexpl(FPBits::negInf(), &exponent)); 23 24 EXPECT_TRUE(FPBits::zero() == __llvm_libc::frexpl(FPBits::zero(), &exponent)); 25 EXPECT_EQ(exponent, 0); 26 27 EXPECT_TRUE(FPBits::negZero() == 28 __llvm_libc::frexpl(FPBits::negZero(), &exponent)); 29 EXPECT_EQ(exponent, 0); 30 31 EXPECT_TRUE( 32 FPBits(__llvm_libc::frexpl(FPBits::buildNaN(1), &exponent)).isNaN()); 33 } 34 35 TEST(FrexplTest, PowersOfTwo) { 36 int exponent; 37 38 EXPECT_TRUE(0.5l == __llvm_libc::frexpl(1.0l, &exponent)); 39 EXPECT_EQ(exponent, 1); 40 EXPECT_TRUE(-0.5l == __llvm_libc::frexpl(-1.0l, &exponent)); 41 EXPECT_EQ(exponent, 1); 42 43 EXPECT_TRUE(0.5l == __llvm_libc::frexpl(2.0l, &exponent)); 44 EXPECT_EQ(exponent, 2); 45 EXPECT_TRUE(-0.5l == __llvm_libc::frexpl(-2.0l, &exponent)); 46 EXPECT_EQ(exponent, 2); 47 48 EXPECT_TRUE(0.5l == __llvm_libc::frexpl(4.0l, &exponent)); 49 EXPECT_EQ(exponent, 3); 50 EXPECT_TRUE(-0.5l == __llvm_libc::frexpl(-4.0l, &exponent)); 51 EXPECT_EQ(exponent, 3); 52 53 EXPECT_TRUE(0.5l == __llvm_libc::frexpl(8.0l, &exponent)); 54 EXPECT_EQ(exponent, 4); 55 EXPECT_TRUE(-0.5l == __llvm_libc::frexpl(-8.0l, &exponent)); 56 EXPECT_EQ(exponent, 4); 57 58 EXPECT_TRUE(0.5l == __llvm_libc::frexpl(16.0l, &exponent)); 59 EXPECT_EQ(exponent, 5); 60 EXPECT_TRUE(-0.5l == __llvm_libc::frexpl(-16.0l, &exponent)); 61 EXPECT_EQ(exponent, 5); 62 63 EXPECT_TRUE(0.5l == __llvm_libc::frexpl(32.0l, &exponent)); 64 EXPECT_EQ(exponent, 6); 65 EXPECT_TRUE(-0.5l == __llvm_libc::frexpl(-32.0l, &exponent)); 66 EXPECT_EQ(exponent, 6); 67 } 68 69 TEST(FrexplTest, SomeIntegers) { 70 int exponent; 71 72 EXPECT_TRUE(0.75l == __llvm_libc::frexpl(24.0l, &exponent)); 73 EXPECT_EQ(exponent, 5); 74 EXPECT_TRUE(-0.75l == __llvm_libc::frexpl(-24.0l, &exponent)); 75 EXPECT_EQ(exponent, 5); 76 77 EXPECT_TRUE(0.625l == __llvm_libc::frexpl(40.0l, &exponent)); 78 EXPECT_EQ(exponent, 6); 79 EXPECT_TRUE(-0.625l == __llvm_libc::frexpl(-40.0l, &exponent)); 80 EXPECT_EQ(exponent, 6); 81 82 EXPECT_TRUE(0.78125l == __llvm_libc::frexpl(800.0l, &exponent)); 83 EXPECT_EQ(exponent, 10); 84 EXPECT_TRUE(-0.78125l == __llvm_libc::frexpl(-800.0l, &exponent)); 85 EXPECT_EQ(exponent, 10); 86 } 87 88 TEST(FrexplTest, LongDoubleRange) { 89 using UIntType = FPBits::UIntType; 90 constexpr UIntType count = 10000000; 91 constexpr UIntType step = UIntType(-1) / count; 92 for (UIntType i = 0, v = 0; i <= count; ++i, v += step) { 93 long double x = FPBits(v); 94 if (isnan(x) || isinf(x) || x == 0.0l) 95 continue; 96 97 int exponent; 98 long double frac = __llvm_libc::frexpl(x, &exponent); 99 100 ASSERT_TRUE(__llvm_libc::fputil::abs(frac) < 1.0l); 101 ASSERT_TRUE(__llvm_libc::fputil::abs(frac) >= 0.5l); 102 } 103 } 104