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 "src/__support/FPUtil/BasicOperations.h"
10#include "src/__support/FPUtil/FPBits.h"
11#include "test/UnitTest/FEnvSafeTest.h"
12#include "test/UnitTest/FPMatcher.h"
13#include "test/UnitTest/Test.h"
14
15template <typename T>
16class FDimTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
17public:
18 using FuncPtr = T (*)(T, T);
19 using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
20 using StorageType = typename FPBits::StorageType;
21
22 const T inf = FPBits::inf(Sign::POS).get_val();
23 const T neg_inf = FPBits::inf(Sign::NEG).get_val();
24 const T zero = FPBits::zero(Sign::POS).get_val();
25 const T neg_zero = FPBits::zero(Sign::NEG).get_val();
26 const T nan = FPBits::quiet_nan().get_val();
27
28 void test_nan_arg(FuncPtr func) {
29 EXPECT_FP_EQ(nan, func(nan, inf));
30 EXPECT_FP_EQ(nan, func(neg_inf, nan));
31 EXPECT_FP_EQ(nan, func(nan, zero));
32 EXPECT_FP_EQ(nan, func(neg_zero, nan));
33 EXPECT_FP_EQ(nan, func(nan, T(-1.2345)));
34 EXPECT_FP_EQ(nan, func(T(1.2345), nan));
35 EXPECT_FP_EQ(func(nan, nan), nan);
36 }
37
38 void test_inf_arg(FuncPtr func) {
39 EXPECT_FP_EQ(zero, func(neg_inf, inf));
40 EXPECT_FP_EQ(inf, func(inf, zero));
41 EXPECT_FP_EQ(zero, func(neg_zero, inf));
42 EXPECT_FP_EQ(inf, func(inf, T(1.2345)));
43 EXPECT_FP_EQ(zero, func(T(-1.2345), inf));
44 }
45
46 void test_neg_inf_arg(FuncPtr func) {
47 EXPECT_FP_EQ(inf, func(inf, neg_inf));
48 EXPECT_FP_EQ(zero, func(neg_inf, zero));
49 EXPECT_FP_EQ(inf, func(neg_zero, neg_inf));
50 EXPECT_FP_EQ(zero, func(neg_inf, T(-1.2345)));
51 EXPECT_FP_EQ(inf, func(T(1.2345), neg_inf));
52 }
53
54 void test_both_zero(FuncPtr func) {
55 EXPECT_FP_EQ(zero, func(zero, zero));
56 EXPECT_FP_EQ(zero, func(zero, neg_zero));
57 EXPECT_FP_EQ(zero, func(neg_zero, zero));
58 EXPECT_FP_EQ(zero, func(neg_zero, neg_zero));
59 }
60
61 void test_in_range(FuncPtr func) {
62 constexpr StorageType STORAGE_MAX =
63 LIBC_NAMESPACE::cpp::numeric_limits<StorageType>::max();
64 constexpr StorageType COUNT = 100'001;
65 constexpr StorageType STEP = STORAGE_MAX / COUNT;
66 for (StorageType i = 0, v = 0, w = STORAGE_MAX; i <= COUNT;
67 ++i, v += STEP, w -= STEP) {
68 FPBits xbits(v), ybits(w);
69 if (xbits.is_inf_or_nan())
70 continue;
71 if (ybits.is_inf_or_nan())
72 continue;
73
74 T x = xbits.get_val();
75 T y = ybits.get_val();
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
86#define LIST_FDIM_TESTS(T, func) \
87 using LlvmLibcFDimTest = FDimTestTemplate<T>; \
88 TEST_F(LlvmLibcFDimTest, NaNArg) { test_nan_arg(&func); } \
89 TEST_F(LlvmLibcFDimTest, InfArg) { test_inf_arg(&func); } \
90 TEST_F(LlvmLibcFDimTest, NegInfArg) { test_neg_inf_arg(&func); } \
91 TEST_F(LlvmLibcFDimTest, BothZero) { test_both_zero(&func); } \
92 TEST_F(LlvmLibcFDimTest, InFloatRange) { test_in_range(&func); } \
93 static_assert(true, "Require semicolon.")
94

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