1//===-- Utility class to test different flavors of fdim ---------*- 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 "hdr/math_macros.h"
10#include "src/__support/FPUtil/BasicOperations.h"
11#include "src/__support/FPUtil/FPBits.h"
12#include "test/UnitTest/FEnvSafeTest.h"
13#include "test/UnitTest/FPMatcher.h"
14#include "test/UnitTest/Test.h"
15
16using LIBC_NAMESPACE::Sign;
17
18template <typename T>
19class FDimTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
20public:
21 using FuncPtr = T (*)(T, T);
22 using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
23 using StorageType = typename FPBits::StorageType;
24
25 const T inf = FPBits::inf(Sign::POS).get_val();
26 const T neg_inf = FPBits::inf(Sign::NEG).get_val();
27 const T zero = FPBits::zero(Sign::POS).get_val();
28 const T neg_zero = FPBits::zero(Sign::NEG).get_val();
29 const T nan = FPBits::quiet_nan().get_val();
30
31 void test_na_n_arg(FuncPtr func) {
32 EXPECT_FP_EQ(nan, func(nan, inf));
33 EXPECT_FP_EQ(nan, func(neg_inf, nan));
34 EXPECT_FP_EQ(nan, func(nan, zero));
35 EXPECT_FP_EQ(nan, func(neg_zero, nan));
36 EXPECT_FP_EQ(nan, func(nan, T(-1.2345)));
37 EXPECT_FP_EQ(nan, func(T(1.2345), nan));
38 EXPECT_FP_EQ(func(nan, nan), nan);
39 }
40
41 void test_inf_arg(FuncPtr func) {
42 EXPECT_FP_EQ(zero, func(neg_inf, inf));
43 EXPECT_FP_EQ(inf, func(inf, zero));
44 EXPECT_FP_EQ(zero, func(neg_zero, inf));
45 EXPECT_FP_EQ(inf, func(inf, T(1.2345)));
46 EXPECT_FP_EQ(zero, func(T(-1.2345), inf));
47 }
48
49 void test_neg_inf_arg(FuncPtr func) {
50 EXPECT_FP_EQ(inf, func(inf, neg_inf));
51 EXPECT_FP_EQ(zero, func(neg_inf, zero));
52 EXPECT_FP_EQ(inf, func(neg_zero, neg_inf));
53 EXPECT_FP_EQ(zero, func(neg_inf, T(-1.2345)));
54 EXPECT_FP_EQ(inf, func(T(1.2345), neg_inf));
55 }
56
57 void test_both_zero(FuncPtr func) {
58 EXPECT_FP_EQ(zero, func(zero, zero));
59 EXPECT_FP_EQ(zero, func(zero, neg_zero));
60 EXPECT_FP_EQ(zero, func(neg_zero, zero));
61 EXPECT_FP_EQ(zero, func(neg_zero, neg_zero));
62 }
63
64 void test_in_range(FuncPtr func) {
65 constexpr StorageType STORAGE_MAX =
66 LIBC_NAMESPACE::cpp::numeric_limits<StorageType>::max();
67 constexpr StorageType COUNT = 100'001;
68 constexpr StorageType STEP = STORAGE_MAX / COUNT;
69 for (StorageType i = 0, v = 0, w = STORAGE_MAX; i <= COUNT;
70 ++i, v += STEP, w -= STEP) {
71 T x = FPBits(v).get_val(), y = FPBits(w).get_val();
72 if (FPBits(v).is_nan() || FPBits(v).is_inf())
73 continue;
74 if (FPBits(w).is_nan() || FPBits(w).is_inf())
75 continue;
76
77 if (x > y) {
78 EXPECT_FP_EQ(x - y, func(x, y));
79 } else {
80 EXPECT_FP_EQ(zero, func(x, y));
81 }
82 }
83 }
84};
85

source code of libc/test/src/math/FDimTest.h