| //===-- Unittests for copysign --------------------------------------------===// |
| // |
| // 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 "include/math.h" |
| #include "src/math/copysign.h" |
| #include "utils/FPUtil/BitPatterns.h" |
| #include "utils/FPUtil/FloatOperations.h" |
| #include "utils/FPUtil/FloatProperties.h" |
| #include "utils/UnitTest/Test.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(CopySignTest, SpecialNumbers) { |
| EXPECT_EQ(BitPatterns::aNegativeQuietNaN, |
| valueAsBits(__llvm_libc::copysign( |
| valueFromBits(BitPatterns::aQuietNaN), -1.0))); |
| EXPECT_EQ(BitPatterns::aQuietNaN, |
| valueAsBits(__llvm_libc::copysign( |
| valueFromBits(BitPatterns::aNegativeQuietNaN), 1.0))); |
| |
| EXPECT_EQ(BitPatterns::aNegativeSignallingNaN, |
| valueAsBits(__llvm_libc::copysign( |
| valueFromBits(BitPatterns::aSignallingNaN), -1.0))); |
| EXPECT_EQ(BitPatterns::aSignallingNaN, |
| valueAsBits(__llvm_libc::copysign( |
| valueFromBits(BitPatterns::aNegativeSignallingNaN), 1.0))); |
| |
| EXPECT_EQ(BitPatterns::negInf, valueAsBits(__llvm_libc::copysign( |
| valueFromBits(BitPatterns::inf), -1.0))); |
| EXPECT_EQ(BitPatterns::inf, valueAsBits(__llvm_libc::copysign( |
| valueFromBits(BitPatterns::negInf), 1.0))); |
| |
| EXPECT_EQ(BitPatterns::negZero, valueAsBits(__llvm_libc::copysign( |
| valueFromBits(BitPatterns::zero), -1.0))); |
| EXPECT_EQ(BitPatterns::zero, valueAsBits(__llvm_libc::copysign( |
| valueFromBits(BitPatterns::negZero), 1.0))); |
| } |
| |
| TEST(CopySignTest, InDoubleRange) { |
| using BitsType = Properties::BitsType; |
| constexpr BitsType count = 1000000; |
| 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) |
| continue; |
| |
| double res1 = __llvm_libc::copysign(x, -x); |
| ASSERT_TRUE(res1 == -x); |
| |
| double res2 = __llvm_libc::copysign(x, x); |
| ASSERT_TRUE(res2 == x); |
| } |
| } |