1 //===-- Unittests for copysignf
2 //--------------------------------------------===//
3 //
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "include/math.h"
11 #include "src/math/copysignf.h"
12 #include "utils/FPUtil/BitPatterns.h"
13 #include "utils/FPUtil/FloatOperations.h"
14 #include "utils/FPUtil/FloatProperties.h"
15 #include "utils/UnitTest/Test.h"
16 
17 using __llvm_libc::fputil::valueAsBits;
18 using __llvm_libc::fputil::valueFromBits;
19 
20 using BitPatterns = __llvm_libc::fputil::BitPatterns<float>;
21 using Properties = __llvm_libc::fputil::FloatProperties<float>;
22 
23 TEST(CopySignFTest, SpecialNumbers) {
24   EXPECT_EQ(BitPatterns::aNegativeQuietNaN,
25             valueAsBits(__llvm_libc::copysignf(
26                 valueFromBits(BitPatterns::aQuietNaN), -1.0f)));
27   EXPECT_EQ(BitPatterns::aQuietNaN,
28             valueAsBits(__llvm_libc::copysignf(
29                 valueFromBits(BitPatterns::aNegativeQuietNaN), 1.0f)));
30 
31   EXPECT_EQ(BitPatterns::aNegativeSignallingNaN,
32             valueAsBits(__llvm_libc::copysignf(
33                 valueFromBits(BitPatterns::aSignallingNaN), -1.0f)));
34   EXPECT_EQ(BitPatterns::aSignallingNaN,
35             valueAsBits(__llvm_libc::copysignf(
36                 valueFromBits(BitPatterns::aNegativeSignallingNaN), 1.0f)));
37 
38   EXPECT_EQ(BitPatterns::negInf, valueAsBits(__llvm_libc::copysignf(
39                                      valueFromBits(BitPatterns::inf), -1.0f)));
40   EXPECT_EQ(BitPatterns::inf, valueAsBits(__llvm_libc::copysignf(
41                                   valueFromBits(BitPatterns::negInf), 1.0f)));
42 
43   EXPECT_EQ(BitPatterns::negZero,
44             valueAsBits(__llvm_libc::copysignf(valueFromBits(BitPatterns::zero),
45                                                -1.0f)));
46   EXPECT_EQ(BitPatterns::zero, valueAsBits(__llvm_libc::copysignf(
47                                    valueFromBits(BitPatterns::negZero), 1.0f)));
48 }
49 
50 TEST(CopySignFTest, InDoubleRange) {
51   using BitsType = Properties::BitsType;
52   constexpr BitsType count = 1000000;
53   constexpr BitsType step = UINT32_MAX / count;
54   for (BitsType i = 0, v = 0; i <= count; ++i, v += step) {
55     float x = valueFromBits(v);
56     if (isnan(x) || isinf(x) || x == 0)
57       continue;
58 
59     float res1 = __llvm_libc::copysignf(x, -x);
60     ASSERT_TRUE(res1 == -x);
61 
62     float res2 = __llvm_libc::copysignf(x, x);
63     ASSERT_TRUE(res2 == x);
64   }
65 }
66