1 //===-- Unittests for modfl -----------------------------------------------===// 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/modfl.h" 11 #include "utils/FPUtil/BasicOperations.h" 12 #include "utils/FPUtil/FPBits.h" 13 #include "utils/FPUtil/NearestIntegerOperations.h" 14 #include "utils/UnitTest/Test.h" 15 16 using FPBits = __llvm_libc::fputil::FPBits<long double>; 17 18 TEST(modflTest, SpecialNumbers) { 19 long double integral; 20 21 EXPECT_TRUE(FPBits::zero() == __llvm_libc::modfl(FPBits::inf(), &integral)); 22 EXPECT_TRUE(FPBits::inf() == integral); 23 24 EXPECT_TRUE(FPBits::negZero() == 25 __llvm_libc::modfl(FPBits::negInf(), &integral)); 26 EXPECT_TRUE(FPBits::negInf() == integral); 27 28 EXPECT_TRUE(FPBits::zero() == __llvm_libc::modfl(FPBits::zero(), &integral)); 29 EXPECT_TRUE(integral == 0.0l); 30 31 EXPECT_TRUE(FPBits::negZero() == 32 __llvm_libc::modfl(FPBits::negZero(), &integral)); 33 EXPECT_TRUE(integral == 0.0l); 34 35 EXPECT_TRUE( 36 FPBits(__llvm_libc::modfl(FPBits::buildNaN(1), &integral)).isNaN()); 37 } 38 39 TEST(modflTest, Integers) { 40 long double integral; 41 42 EXPECT_TRUE(FPBits::zero() == __llvm_libc::modfl(1.0l, &integral)); 43 EXPECT_TRUE(integral == 1.0l); 44 45 EXPECT_TRUE(FPBits::negZero() == __llvm_libc::modfl(-1.0l, &integral)); 46 EXPECT_TRUE(integral == -1.0l); 47 48 EXPECT_TRUE(FPBits::zero() == __llvm_libc::modfl(10.0l, &integral)); 49 EXPECT_TRUE(integral == 10.0l); 50 51 EXPECT_TRUE(FPBits::negZero() == __llvm_libc::modfl(-10.0l, &integral)); 52 EXPECT_TRUE(integral == -10.0l); 53 54 EXPECT_TRUE(FPBits::zero() == __llvm_libc::modfl(12345.0l, &integral)); 55 EXPECT_TRUE(integral == 12345.0l); 56 57 EXPECT_TRUE(FPBits::negZero() == __llvm_libc::modfl(-12345.0l, &integral)); 58 EXPECT_TRUE(integral == -12345.0l); 59 } 60 61 TEST(ModfTest, Fractions) { 62 long double integral; 63 64 EXPECT_TRUE(0.5l == __llvm_libc::modfl(1.5l, &integral)); 65 EXPECT_TRUE(integral == 1.0l); 66 67 EXPECT_TRUE(-0.5l == __llvm_libc::modfl(-1.5l, &integral)); 68 EXPECT_TRUE(integral == -1.0l); 69 70 EXPECT_TRUE(0.75l == __llvm_libc::modfl(10.75l, &integral)); 71 EXPECT_TRUE(integral == 10.0l); 72 73 EXPECT_TRUE(-0.75l == __llvm_libc::modfl(-10.75l, &integral)); 74 EXPECT_TRUE(integral == -10.0l); 75 76 EXPECT_TRUE(0.125l == __llvm_libc::modfl(100.125l, &integral)); 77 EXPECT_TRUE(integral == 100.0l); 78 79 EXPECT_TRUE(-0.125l == __llvm_libc::modfl(-100.125l, &integral)); 80 EXPECT_TRUE(integral == -100.0l); 81 } 82 83 TEST(ModflTest, LongDoubleRange) { 84 using UIntType = FPBits::UIntType; 85 constexpr UIntType count = 10000000; 86 constexpr UIntType step = UIntType(-1) / count; 87 for (UIntType i = 0, v = 0; i <= count; ++i, v += step) { 88 long double x = FPBits(v); 89 if (isnan(x) || isinf(x) || x == 0.0l) 90 continue; 91 92 long double integral; 93 long double frac = __llvm_libc::modfl(x, &integral); 94 ASSERT_TRUE(__llvm_libc::fputil::abs(frac) < 1.0l); 95 ASSERT_TRUE(__llvm_libc::fputil::trunc(x) == integral); 96 ASSERT_TRUE(integral + frac == x); 97 } 98 } 99