1 //===-- Unittests for logbl -----------------------------------------------===// 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/logbl.h" 11 #include "utils/FPUtil/FPBits.h" 12 #include "utils/FPUtil/ManipulationFunctions.h" 13 #include "utils/UnitTest/Test.h" 14 15 using FPBits = __llvm_libc::fputil::FPBits<long double>; 16 17 TEST(logblTest, SpecialNumbers) { 18 EXPECT_TRUE(FPBits::inf() == __llvm_libc::logbl(FPBits::inf())); 19 EXPECT_TRUE(FPBits::inf() == __llvm_libc::logbl(FPBits::negInf())); 20 21 EXPECT_TRUE(FPBits::negInf() == __llvm_libc::logbl(FPBits::zero())); 22 EXPECT_TRUE(FPBits::negInf() == __llvm_libc::logbl(FPBits::negZero())); 23 24 EXPECT_TRUE(FPBits(__llvm_libc::logbl(FPBits::buildNaN(1))).isNaN()); 25 } 26 27 TEST(logblTest, PowersOfTwo) { 28 EXPECT_TRUE(0.0l == __llvm_libc::logbl(1.0l)); 29 EXPECT_TRUE(0.0l == __llvm_libc::logbl(-1.0l)); 30 31 EXPECT_TRUE(1.0l == __llvm_libc::logbl(2.0l)); 32 EXPECT_TRUE(1.0l == __llvm_libc::logbl(-2.0l)); 33 34 EXPECT_TRUE(2.0l == __llvm_libc::logbl(4.0l)); 35 EXPECT_TRUE(2.0l == __llvm_libc::logbl(-4.0l)); 36 37 EXPECT_TRUE(3.0l == __llvm_libc::logbl(8.0l)); 38 EXPECT_TRUE(3.0l == __llvm_libc::logbl(-8.0l)); 39 40 EXPECT_TRUE(4.0l == __llvm_libc::logbl(16.0l)); 41 EXPECT_TRUE(4.0l == __llvm_libc::logbl(-16.0l)); 42 43 EXPECT_TRUE(5.0l == __llvm_libc::logbl(32.0l)); 44 EXPECT_TRUE(5.0l == __llvm_libc::logbl(-32.0l)); 45 } 46 47 TEST(LogbTest, SomeIntegers) { 48 EXPECT_TRUE(1.0l == __llvm_libc::logbl(3.0l)); 49 EXPECT_TRUE(1.0l == __llvm_libc::logbl(-3.0l)); 50 51 EXPECT_TRUE(2.0l == __llvm_libc::logbl(7.0l)); 52 EXPECT_TRUE(2.0l == __llvm_libc::logbl(-7.0l)); 53 54 EXPECT_TRUE(3.0l == __llvm_libc::logbl(10.0l)); 55 EXPECT_TRUE(3.0l == __llvm_libc::logbl(-10.0l)); 56 57 EXPECT_TRUE(4.0l == __llvm_libc::logbl(31.0l)); 58 EXPECT_TRUE(4.0l == __llvm_libc::logbl(-31.0l)); 59 60 EXPECT_TRUE(5.0l == __llvm_libc::logbl(55.0l)); 61 EXPECT_TRUE(5.0l == __llvm_libc::logbl(-55.0l)); 62 } 63 64 TEST(LogblTest, LongDoubleRange) { 65 using UIntType = FPBits::UIntType; 66 constexpr UIntType count = 10000000; 67 constexpr UIntType step = UIntType(-1) / count; 68 for (UIntType i = 0, v = 0; i <= count; ++i, v += step) { 69 long double x = FPBits(v); 70 if (isnan(x) || isinf(x) || x == 0.0l) 71 continue; 72 73 int exponent; 74 __llvm_libc::fputil::frexp(x, exponent); 75 ASSERT_TRUE((long double)(exponent) == __llvm_libc::logbl(x) + 1.0l); 76 } 77 } 78