xref: /aosp_15_r20/external/llvm-libc/test/src/math/smoke/RemQuoTest.h (revision 71db0c75aadcf003ffe3238005f61d7618a3fead)
1 //===-- Utility class to test different flavors of remquo -------*- 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 #ifndef LLVM_LIBC_TEST_SRC_MATH_REMQUOTEST_H
10 #define LLVM_LIBC_TEST_SRC_MATH_REMQUOTEST_H
11 
12 #include "src/__support/FPUtil/FPBits.h"
13 #include "test/UnitTest/FEnvSafeTest.h"
14 #include "test/UnitTest/FPMatcher.h"
15 #include "test/UnitTest/Test.h"
16 
17 using LIBC_NAMESPACE::Sign;
18 
19 template <typename T>
20 class RemQuoTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest {
21   using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>;
22   using StorageType = typename FPBits::StorageType;
23 
24   const T inf = FPBits::inf(Sign::POS).get_val();
25   const T neg_inf = FPBits::inf(Sign::NEG).get_val();
26   const T zero = FPBits::zero(Sign::POS).get_val();
27   const T neg_zero = FPBits::zero(Sign::NEG).get_val();
28   const T nan = FPBits::quiet_nan().get_val();
29 
30 public:
31   typedef T (*RemQuoFunc)(T, T, int *);
32 
testSpecialNumbers(RemQuoFunc func)33   void testSpecialNumbers(RemQuoFunc func) {
34     int quotient;
35     T x, y;
36 
37     y = T(1.0);
38     x = inf;
39     EXPECT_FP_EQ(nan, func(x, y, &quotient));
40     x = neg_inf;
41     EXPECT_FP_EQ(nan, func(x, y, &quotient));
42 
43     x = T(1.0);
44     y = zero;
45     EXPECT_FP_EQ(nan, func(x, y, &quotient));
46     y = neg_zero;
47     EXPECT_FP_EQ(nan, func(x, y, &quotient));
48 
49     y = nan;
50     x = T(1.0);
51     EXPECT_FP_EQ(nan, func(x, y, &quotient));
52 
53     y = T(1.0);
54     x = nan;
55     EXPECT_FP_EQ(nan, func(x, y, &quotient));
56 
57     x = nan;
58     y = nan;
59     EXPECT_FP_EQ(nan, func(x, y, &quotient));
60 
61     x = zero;
62     y = T(1.0);
63     EXPECT_FP_EQ(func(x, y, &quotient), zero);
64 
65     x = neg_zero;
66     y = T(1.0);
67     EXPECT_FP_EQ(func(x, y, &quotient), neg_zero);
68 
69     x = T(1.125);
70     y = inf;
71     EXPECT_FP_EQ(func(x, y, &quotient), x);
72     EXPECT_EQ(quotient, 0);
73   }
74 
testEqualNumeratorAndDenominator(RemQuoFunc func)75   void testEqualNumeratorAndDenominator(RemQuoFunc func) {
76     T x = T(1.125), y = T(1.125);
77     int q;
78 
79     // When the remainder is zero, the standard requires it to
80     // have the same sign as x.
81 
82     EXPECT_FP_EQ(func(x, y, &q), zero);
83     EXPECT_EQ(q, 1);
84 
85     EXPECT_FP_EQ(func(x, -y, &q), zero);
86     EXPECT_EQ(q, -1);
87 
88     EXPECT_FP_EQ(func(-x, y, &q), neg_zero);
89     EXPECT_EQ(q, -1);
90 
91     EXPECT_FP_EQ(func(-x, -y, &q), neg_zero);
92     EXPECT_EQ(q, 1);
93   }
94 };
95 
96 #define LIST_REMQUO_TESTS(T, func)                                             \
97   using LlvmLibcRemQuoTest = RemQuoTestTemplate<T>;                            \
98   TEST_F(LlvmLibcRemQuoTest, SpecialNumbers) { testSpecialNumbers(&func); }    \
99   TEST_F(LlvmLibcRemQuoTest, EqualNumeratorAndDenominator) {                   \
100     testEqualNumeratorAndDenominator(&func);                                   \
101   }
102 
103 #endif // LLVM_LIBC_TEST_SRC_MATH_REMQUOTEST_H
104