1 //===-- Utility class to test copysign[f|l] ---------------------*- C++ -*-===//
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 "utils/FPUtil/TestHelpers.h"
10 #include "utils/MPFRWrapper/MPFRUtils.h"
11 #include "utils/UnitTest/Test.h"
12 
13 #include <math.h>
14 
15 namespace mpfr = __llvm_libc::testing::mpfr;
16 
17 template <typename T> class CopySignTest : public __llvm_libc::testing::Test {
18 
19   DECLARE_SPECIAL_CONSTANTS(T)
20 
21 public:
22   typedef T (*CopySignFunc)(T, T);
23 
testSpecialNumbers(CopySignFunc func)24   void testSpecialNumbers(CopySignFunc func) {
25     EXPECT_FP_EQ(aNaN, func(aNaN, -1.0));
26     EXPECT_FP_EQ(aNaN, func(aNaN, 1.0));
27 
28     EXPECT_FP_EQ(negInf, func(inf, -1.0));
29     EXPECT_FP_EQ(inf, func(negInf, 1.0));
30 
31     EXPECT_FP_EQ(negZero, func(zero, -1.0));
32     EXPECT_FP_EQ(zero, func(negZero, 1.0));
33   }
34 
testRange(CopySignFunc func)35   void testRange(CopySignFunc func) {
36     constexpr UIntType count = 10000000;
37     constexpr UIntType step = UIntType(-1) / count;
38     for (UIntType i = 0, v = 0; i <= count; ++i, v += step) {
39       T x = T(FPBits(v));
40       if (isnan(x) || isinf(x))
41         continue;
42 
43       double res1 = func(x, -x);
44       ASSERT_FP_EQ(res1, -x);
45 
46       double res2 = func(x, x);
47       ASSERT_FP_EQ(res2, x);
48     }
49   }
50 };
51 
52 #define LIST_COPYSIGN_TESTS(T, func)                                           \
53   using LlvmLibcCopySignTest = CopySignTest<T>;                                \
54   TEST_F(LlvmLibcCopySignTest, SpecialNumbers) { testSpecialNumbers(&func); }  \
55   TEST_F(LlvmLibcCopySignTest, Range) { testRange(&func); }
56