1 //===-- Utility class to test fmin[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 FMaxTest : public __llvm_libc::testing::Test {
18 
19   DECLARE_SPECIAL_CONSTANTS(T)
20 
21 public:
22   typedef T (*FMaxFunc)(T, T);
23 
testNaN(FMaxFunc func)24   void testNaN(FMaxFunc func) {
25     EXPECT_FP_EQ(inf, func(aNaN, inf));
26     EXPECT_FP_EQ(negInf, func(negInf, aNaN));
27     EXPECT_FP_EQ(0.0, func(aNaN, 0.0));
28     EXPECT_FP_EQ(-0.0, func(-0.0, aNaN));
29     EXPECT_FP_EQ(T(-1.2345), func(aNaN, T(-1.2345)));
30     EXPECT_FP_EQ(T(1.2345), func(T(1.2345), aNaN));
31     EXPECT_FP_EQ(aNaN, func(aNaN, aNaN));
32   }
33 
testInfArg(FMaxFunc func)34   void testInfArg(FMaxFunc func) {
35     EXPECT_FP_EQ(inf, func(negInf, inf));
36     EXPECT_FP_EQ(inf, func(inf, 0.0));
37     EXPECT_FP_EQ(inf, func(-0.0, inf));
38     EXPECT_FP_EQ(inf, func(inf, T(1.2345)));
39     EXPECT_FP_EQ(inf, func(T(-1.2345), inf));
40   }
41 
testNegInfArg(FMaxFunc func)42   void testNegInfArg(FMaxFunc func) {
43     EXPECT_FP_EQ(inf, func(inf, negInf));
44     EXPECT_FP_EQ(0.0, func(negInf, 0.0));
45     EXPECT_FP_EQ(-0.0, func(-0.0, negInf));
46     EXPECT_FP_EQ(T(-1.2345), func(negInf, T(-1.2345)));
47     EXPECT_FP_EQ(T(1.2345), func(T(1.2345), negInf));
48   }
49 
testBothZero(FMaxFunc func)50   void testBothZero(FMaxFunc func) {
51     EXPECT_FP_EQ(0.0, func(0.0, 0.0));
52     EXPECT_FP_EQ(0.0, func(-0.0, 0.0));
53     EXPECT_FP_EQ(0.0, func(0.0, -0.0));
54     EXPECT_FP_EQ(-0.0, func(-0.0, -0.0));
55   }
56 
testRange(FMaxFunc func)57   void testRange(FMaxFunc func) {
58     constexpr UIntType count = 10000001;
59     constexpr UIntType step = UIntType(-1) / count;
60     for (UIntType i = 0, v = 0, w = UIntType(-1); i <= count;
61          ++i, v += step, w -= step) {
62       T x = T(FPBits(v)), y = T(FPBits(w));
63       if (isnan(x) || isinf(x))
64         continue;
65       if (isnan(y) || isinf(y))
66         continue;
67       if ((x == 0) && (y == 0))
68         continue;
69 
70       if (x > y) {
71         EXPECT_FP_EQ(x, func(x, y));
72       } else {
73         EXPECT_FP_EQ(y, func(x, y));
74       }
75     }
76   }
77 };
78 
79 #define LIST_FMAX_TESTS(T, func)                                               \
80   using LlvmLibcFMaxTest = FMaxTest<T>;                                        \
81   TEST_F(LlvmLibcFMaxTest, NaN) { testNaN(&func); }                            \
82   TEST_F(LlvmLibcFMaxTest, InfArg) { testInfArg(&func); }                      \
83   TEST_F(LlvmLibcFMaxTest, NegInfArg) { testNegInfArg(&func); }                \
84   TEST_F(LlvmLibcFMaxTest, BothZero) { testBothZero(&func); }                  \
85   TEST_F(LlvmLibcFMaxTest, Range) { testRange(&func); }
86