| //===-- Unittests for logb ------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "src/math/logb.h" |
| #include "utils/FPUtil/BitPatterns.h" |
| #include "utils/FPUtil/FloatOperations.h" |
| #include "utils/FPUtil/FloatProperties.h" |
| #include "utils/FPUtil/ManipulationFunctions.h" |
| #include "utils/UnitTest/Test.h" |
| #include <math.h> |
| |
| using __llvm_libc::fputil::valueAsBits; |
| using __llvm_libc::fputil::valueFromBits; |
| |
| using BitPatterns = __llvm_libc::fputil::BitPatterns<double>; |
| using Properties = __llvm_libc::fputil::FloatProperties<double>; |
| |
| TEST(LlvmLibcLogbTest, SpecialNumbers) { |
| EXPECT_EQ( |
| BitPatterns::aQuietNaN, |
| valueAsBits(__llvm_libc::logb(valueFromBits(BitPatterns::aQuietNaN)))); |
| EXPECT_EQ(BitPatterns::aNegativeQuietNaN, |
| valueAsBits(__llvm_libc::logb( |
| valueFromBits(BitPatterns::aNegativeQuietNaN)))); |
| |
| EXPECT_EQ(BitPatterns::aSignallingNaN, |
| valueAsBits( |
| __llvm_libc::logb(valueFromBits(BitPatterns::aSignallingNaN)))); |
| EXPECT_EQ(BitPatterns::aNegativeSignallingNaN, |
| valueAsBits(__llvm_libc::logb( |
| valueFromBits(BitPatterns::aNegativeSignallingNaN)))); |
| |
| EXPECT_EQ(BitPatterns::inf, |
| valueAsBits(__llvm_libc::logb(valueFromBits(BitPatterns::inf)))); |
| EXPECT_EQ(BitPatterns::inf, |
| valueAsBits(__llvm_libc::logb(valueFromBits(BitPatterns::negInf)))); |
| |
| EXPECT_EQ(BitPatterns::negInf, |
| valueAsBits(__llvm_libc::logb(valueFromBits(BitPatterns::zero)))); |
| EXPECT_EQ(BitPatterns::negInf, valueAsBits(__llvm_libc::logb( |
| valueFromBits(BitPatterns::negZero)))); |
| } |
| |
| TEST(LlvmLibcLogbTest, PowersOfTwo) { |
| EXPECT_EQ(valueAsBits(0.0), valueAsBits(__llvm_libc::logb(1.0))); |
| EXPECT_EQ(valueAsBits(0.0), valueAsBits(__llvm_libc::logb(-1.0))); |
| |
| EXPECT_EQ(valueAsBits(1.0), valueAsBits(__llvm_libc::logb(2.0))); |
| EXPECT_EQ(valueAsBits(1.0), valueAsBits(__llvm_libc::logb(-2.0))); |
| |
| EXPECT_EQ(valueAsBits(2.0), valueAsBits(__llvm_libc::logb(4.0))); |
| EXPECT_EQ(valueAsBits(2.0), valueAsBits(__llvm_libc::logb(-4.0))); |
| |
| EXPECT_EQ(valueAsBits(3.0), valueAsBits(__llvm_libc::logb(8.0))); |
| EXPECT_EQ(valueAsBits(3.0), valueAsBits(__llvm_libc::logb(-8.0))); |
| |
| EXPECT_EQ(valueAsBits(4.0), valueAsBits(__llvm_libc::logb(16.0))); |
| EXPECT_EQ(valueAsBits(4.0), valueAsBits(__llvm_libc::logb(-16.0))); |
| |
| EXPECT_EQ(valueAsBits(5.0), valueAsBits(__llvm_libc::logb(32.0))); |
| EXPECT_EQ(valueAsBits(5.0), valueAsBits(__llvm_libc::logb(-32.0))); |
| } |
| |
| TEST(LlvmLibcLogbTest, SomeIntegers) { |
| EXPECT_EQ(valueAsBits(1.0), valueAsBits(__llvm_libc::logb(3.0))); |
| EXPECT_EQ(valueAsBits(1.0), valueAsBits(__llvm_libc::logb(-3.0))); |
| |
| EXPECT_EQ(valueAsBits(2.0), valueAsBits(__llvm_libc::logb(7.0))); |
| EXPECT_EQ(valueAsBits(2.0), valueAsBits(__llvm_libc::logb(-7.0))); |
| |
| EXPECT_EQ(valueAsBits(3.0), valueAsBits(__llvm_libc::logb(10.0))); |
| EXPECT_EQ(valueAsBits(3.0), valueAsBits(__llvm_libc::logb(-10.0))); |
| |
| EXPECT_EQ(valueAsBits(4.0), valueAsBits(__llvm_libc::logb(31.0))); |
| EXPECT_EQ(valueAsBits(4.0), valueAsBits(__llvm_libc::logb(-31.0))); |
| |
| EXPECT_EQ(valueAsBits(5.0), valueAsBits(__llvm_libc::logb(55.0))); |
| EXPECT_EQ(valueAsBits(5.0), valueAsBits(__llvm_libc::logb(-55.0))); |
| } |
| |
| TEST(LlvmLibcLogbTest, InDoubleRange) { |
| using BitsType = Properties::BitsType; |
| constexpr BitsType count = 10000000; |
| constexpr BitsType step = UINT64_MAX / count; |
| for (BitsType i = 0, v = 0; i <= count; ++i, v += step) { |
| double x = valueFromBits(v); |
| if (isnan(x) || isinf(x) || x == 0.0) |
| continue; |
| |
| int exponent; |
| __llvm_libc::fputil::frexp(x, exponent); |
| ASSERT_TRUE(double(exponent) == __llvm_libc::logb(x) + 1.0); |
| } |
| } |