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

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