1 // Copyright (c) Microsoft Corporation.
2 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
3 
4 #ifndef DOUBLE_HEX_PRECISION_TO_CHARS_TEST_CASES_HPP
5 #define DOUBLE_HEX_PRECISION_TO_CHARS_TEST_CASES_HPP
6 
7 #include <charconv>
8 
9 #include "test.hpp"
10 using namespace std;
11 
12 inline constexpr DoublePrecisionToCharsTestCase double_hex_precision_to_chars_test_cases[] = {
13     // Test special cases (zero, inf, nan) and an ordinary case. Also test negative signs.
14     {0.0, chars_format::hex, 4, "0.0000p+0"},
15     {-0.0, chars_format::hex, 4, "-0.0000p+0"},
16     {double_inf, chars_format::hex, 4, "inf"},
17     {-double_inf, chars_format::hex, 4, "-inf"},
18     {double_nan, chars_format::hex, 4, "nan"},
19     {-double_nan, chars_format::hex, 4, "-nan(ind)"},
20     {double_nan_payload, chars_format::hex, 4, "nan"},
21     {-double_nan_payload, chars_format::hex, 4, "-nan"},
22     {0x1.729p+0, chars_format::hex, 4, "1.7290p+0"},
23     {-0x1.729p+0, chars_format::hex, 4, "-1.7290p+0"},
24 
25     // Test hexfloat corner cases.
26     {0x1.728p+0, chars_format::hex, 13, "1.7280000000000p+0"},
27     {0x0.0000000000001p-1022, chars_format::hex, 13, "0.0000000000001p-1022"}, // min subnormal
28     {0x0.fffffffffffffp-1022, chars_format::hex, 13, "0.fffffffffffffp-1022"}, // max subnormal
29     {0x1p-1022, chars_format::hex, 13, "1.0000000000000p-1022"}, // min normal
30     {0x1.fffffffffffffp+1023, chars_format::hex, 13, "1.fffffffffffffp+1023"}, // max normal
31 
32     // Test hexfloat exponents.
33     {0x1p-1009, chars_format::hex, 0, "1p-1009"},
34     {0x1p-999, chars_format::hex, 0, "1p-999"},
35     {0x1p-99, chars_format::hex, 0, "1p-99"},
36     {0x1p-9, chars_format::hex, 0, "1p-9"},
37     {0x1p+0, chars_format::hex, 0, "1p+0"},
38     {0x1p+9, chars_format::hex, 0, "1p+9"},
39     {0x1p+99, chars_format::hex, 0, "1p+99"},
40     {0x1p+999, chars_format::hex, 0, "1p+999"},
41     {0x1p+1009, chars_format::hex, 0, "1p+1009"},
42 
43     // Test hexfloat hexits.
44     {0x1.01234567p+0, chars_format::hex, 8, "1.01234567p+0"},
45     {0x1.89abcdefp+0, chars_format::hex, 8, "1.89abcdefp+0"},
46 
47     // Test varying precision. Negative precision requests full precision, not shortest round-trip.
48     {0x1.1234561234561p+0, chars_format::hex, -2, "1.1234561234561p+0"},
49     {0x1.1234561234561p+0, chars_format::hex, -1, "1.1234561234561p+0"},
50     {0x1.1234561234561p+0, chars_format::hex, 0, "1p+0"},
51     {0x1.1234561234561p+0, chars_format::hex, 1, "1.1p+0"},
52     {0x1.1234561234561p+0, chars_format::hex, 2, "1.12p+0"},
53     {0x1.1234561234561p+0, chars_format::hex, 3, "1.123p+0"},
54     {0x1.1234561234561p+0, chars_format::hex, 4, "1.1234p+0"},
55     {0x1.1234561234561p+0, chars_format::hex, 5, "1.12345p+0"},
56     {0x1.1234561234561p+0, chars_format::hex, 6, "1.123456p+0"},
57     {0x1.1234561234561p+0, chars_format::hex, 7, "1.1234561p+0"},
58     {0x1.1234561234561p+0, chars_format::hex, 8, "1.12345612p+0"},
59     {0x1.1234561234561p+0, chars_format::hex, 9, "1.123456123p+0"},
60     {0x1.1234561234561p+0, chars_format::hex, 10, "1.1234561234p+0"},
61     {0x1.1234561234561p+0, chars_format::hex, 11, "1.12345612345p+0"},
62     {0x1.1234561234561p+0, chars_format::hex, 12, "1.123456123456p+0"},
63     {0x1.1234561234561p+0, chars_format::hex, 13, "1.1234561234561p+0"},
64     {0x1.1234561234561p+0, chars_format::hex, 14, "1.12345612345610p+0"},
65     {0x1.1234561234561p+0, chars_format::hex, 15, "1.123456123456100p+0"},
66     {0x1.1234561234561p+0, chars_format::hex, 16, "1.1234561234561000p+0"},
67 
68     // Test rounding at every position.
69     {0x1.cccccccccccccp+0, chars_format::hex, 0, "2p+0"},
70     {0x1.cccccccccccccp+0, chars_format::hex, 1, "1.dp+0"},
71     {0x1.cccccccccccccp+0, chars_format::hex, 2, "1.cdp+0"},
72     {0x1.cccccccccccccp+0, chars_format::hex, 3, "1.ccdp+0"},
73     {0x1.cccccccccccccp+0, chars_format::hex, 4, "1.cccdp+0"},
74     {0x1.cccccccccccccp+0, chars_format::hex, 5, "1.ccccdp+0"},
75     {0x1.cccccccccccccp+0, chars_format::hex, 6, "1.cccccdp+0"},
76     {0x1.cccccccccccccp+0, chars_format::hex, 7, "1.ccccccdp+0"},
77     {0x1.cccccccccccccp+0, chars_format::hex, 8, "1.cccccccdp+0"},
78     {0x1.cccccccccccccp+0, chars_format::hex, 9, "1.ccccccccdp+0"},
79     {0x1.cccccccccccccp+0, chars_format::hex, 10, "1.cccccccccdp+0"},
80     {0x1.cccccccccccccp+0, chars_format::hex, 11, "1.ccccccccccdp+0"},
81     {0x1.cccccccccccccp+0, chars_format::hex, 12, "1.cccccccccccdp+0"},
82     {0x1.cccccccccccccp+0, chars_format::hex, 13, "1.cccccccccccccp+0"},
83 
84     // Test all combinations of least significant bit, round bit, and trailing bits.
85     {0x1.04000p+0, chars_format::hex, 2, "1.04p+0"}, // Lsb 0, Round 0, Trailing 0
86     {0x1.04001p+0, chars_format::hex, 2, "1.04p+0"}, // Lsb 0, Round 0 and Trailing 1 in different hexits
87     {0x1.04200p+0, chars_format::hex, 2, "1.04p+0"}, // Lsb 0, Round 0 and Trailing 1 in same hexit
88     {0x1.04800p+0, chars_format::hex, 2, "1.04p+0"}, // Lsb 0, Round 1, Trailing 0
89     {0x1.04801p+0, chars_format::hex, 2, "1.05p+0"}, // Lsb 0, Round 1 and Trailing 1 in different hexits
90     {0x1.04900p+0, chars_format::hex, 2, "1.05p+0"}, // Lsb 0, Round 1 and Trailing 1 in same hexit
91     {0x1.05000p+0, chars_format::hex, 2, "1.05p+0"}, // Lsb 1, Round 0, Trailing 0
92     {0x1.05001p+0, chars_format::hex, 2, "1.05p+0"}, // Lsb 1, Round 0 and Trailing 1 in different hexits
93     {0x1.05200p+0, chars_format::hex, 2, "1.05p+0"}, // Lsb 1, Round 0 and Trailing 1 in same hexit
94     {0x1.05800p+0, chars_format::hex, 2, "1.06p+0"}, // Lsb 1, Round 1, Trailing 0
95     {0x1.05801p+0, chars_format::hex, 2, "1.06p+0"}, // Lsb 1, Round 1 and Trailing 1 in different hexits
96     {0x1.05900p+0, chars_format::hex, 2, "1.06p+0"}, // Lsb 1, Round 1 and Trailing 1 in same hexit
97 
98     // Test carry propagation.
99     {0x1.0affffffffffep+0, chars_format::hex, 12, "1.0b0000000000p+0"},
100 
101     // Test carry propagation into the leading hexit.
102     {0x0.fffffffffffffp-1022, chars_format::hex, 12, "1.000000000000p-1022"},
103     {0x1.fffffffffffffp+1023, chars_format::hex, 12, "2.000000000000p+1023"},
104 
105     // Test how the leading hexit participates in the rounding decision.
106     {0x0.000p+0, chars_format::hex, 0, "0p+0"},
107     {0x0.001p-1022, chars_format::hex, 0, "0p-1022"},
108     {0x0.200p-1022, chars_format::hex, 0, "0p-1022"},
109     {0x0.800p-1022, chars_format::hex, 0, "0p-1022"},
110     {0x0.801p-1022, chars_format::hex, 0, "1p-1022"},
111     {0x0.900p-1022, chars_format::hex, 0, "1p-1022"},
112     {0x1.000p+0, chars_format::hex, 0, "1p+0"},
113     {0x1.001p+0, chars_format::hex, 0, "1p+0"},
114     {0x1.200p+0, chars_format::hex, 0, "1p+0"},
115     {0x1.800p+0, chars_format::hex, 0, "2p+0"},
116     {0x1.801p+0, chars_format::hex, 0, "2p+0"},
117     {0x1.900p+0, chars_format::hex, 0, "2p+0"},
118 };
119 
120 #endif // DOUBLE_HEX_PRECISION_TO_CHARS_TEST_CASES_HPP
121