1/* Test nan functions payload handling (bug 16961).
2 Copyright (C) 2015-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <float.h>
20#include <math.h>
21#include <stdio.h>
22#include <stdlib.h>
23#include <string.h>
24
25/* Avoid built-in functions. */
26#define WRAP_NAN(FUNC, STR) \
27 ({ const char *volatile wns = (STR); FUNC (wns); })
28#define WRAP_STRTO(FUNC, STR) \
29 ({ const char *volatile wss = (STR); FUNC (wss, NULL); })
30
31#define CHECK_IS_NAN(TYPE, A) \
32 do \
33 { \
34 if (isnan (A)) \
35 puts ("PASS: " #TYPE " " #A); \
36 else \
37 { \
38 puts ("FAIL: " #TYPE " " #A); \
39 result = 1; \
40 } \
41 } \
42 while (0)
43
44#define CHECK_SAME_NAN(TYPE, A, B) \
45 do \
46 { \
47 if (memcmp (&(A), &(B), sizeof (A)) == 0) \
48 puts ("PASS: " #TYPE " " #A " = " #B); \
49 else \
50 { \
51 puts ("FAIL: " #TYPE " " #A " = " #B); \
52 result = 1; \
53 } \
54 } \
55 while (0)
56
57#define CHECK_DIFF_NAN(TYPE, A, B) \
58 do \
59 { \
60 if (memcmp (&(A), &(B), sizeof (A)) != 0) \
61 puts ("PASS: " #TYPE " " #A " != " #B); \
62 else \
63 { \
64 puts ("FAIL: " #TYPE " " #A " != " #B); \
65 result = 1; \
66 } \
67 } \
68 while (0)
69
70/* Cannot test payloads by memcmp for formats where NaNs have padding
71 bits. */
72#define CAN_TEST_EQ(MANT_DIG) ((MANT_DIG) != 64 && (MANT_DIG) != 106)
73
74#define RUN_TESTS(TYPE, SFUNC, FUNC, MANT_DIG) \
75 do \
76 { \
77 TYPE n123 = WRAP_NAN (FUNC, "123"); \
78 CHECK_IS_NAN (TYPE, n123); \
79 TYPE s123 = WRAP_STRTO (SFUNC, "NAN(123)"); \
80 CHECK_IS_NAN (TYPE, s123); \
81 TYPE n456 = WRAP_NAN (FUNC, "456"); \
82 CHECK_IS_NAN (TYPE, n456); \
83 TYPE s456 = WRAP_STRTO (SFUNC, "NAN(456)"); \
84 CHECK_IS_NAN (TYPE, s456); \
85 TYPE n123x = WRAP_NAN (FUNC, "123)"); \
86 CHECK_IS_NAN (TYPE, n123x); \
87 TYPE nemp = WRAP_NAN (FUNC, ""); \
88 CHECK_IS_NAN (TYPE, nemp); \
89 TYPE semp = WRAP_STRTO (SFUNC, "NAN()"); \
90 CHECK_IS_NAN (TYPE, semp); \
91 TYPE sx = WRAP_STRTO (SFUNC, "NAN"); \
92 CHECK_IS_NAN (TYPE, sx); \
93 if (CAN_TEST_EQ (MANT_DIG)) \
94 CHECK_SAME_NAN (TYPE, n123, s123); \
95 if (CAN_TEST_EQ (MANT_DIG)) \
96 CHECK_SAME_NAN (TYPE, n456, s456); \
97 if (CAN_TEST_EQ (MANT_DIG)) \
98 CHECK_SAME_NAN (TYPE, nemp, semp); \
99 if (CAN_TEST_EQ (MANT_DIG)) \
100 CHECK_SAME_NAN (TYPE, n123x, sx); \
101 CHECK_DIFF_NAN (TYPE, n123, n456); \
102 CHECK_DIFF_NAN (TYPE, n123, nemp); \
103 CHECK_DIFF_NAN (TYPE, n123, n123x); \
104 CHECK_DIFF_NAN (TYPE, n456, nemp); \
105 CHECK_DIFF_NAN (TYPE, n456, n123x); \
106 } \
107 while (0)
108
109static int
110do_test (void)
111{
112 int result = 0;
113 RUN_TESTS (float, strtof, nanf, FLT_MANT_DIG);
114 RUN_TESTS (double, strtod, nan, DBL_MANT_DIG);
115 RUN_TESTS (long double, strtold, nanl, LDBL_MANT_DIG);
116 return result;
117}
118
119#define TEST_FUNCTION do_test ()
120#include "../test-skeleton.c"
121

source code of glibc/math/test-nan-payload.c