1/* Test that tininess.h is correct for this architecture.
2 Copyright (C) 2012-2022 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 <fenv.h>
20#include <float.h>
21#include <stdio.h>
22#include <tininess.h>
23
24volatile float a = 0x1.fffp-126;
25volatile float b = 0x1.0008p-1;
26volatile float c;
27volatile float m = FLT_MIN;
28volatile float mm;
29
30static int
31do_test (void)
32{
33 int result = 0;
34#ifdef FE_UNDERFLOW
35 feclearexcept (FE_ALL_EXCEPT);
36 mm = m * m;
37 if (!fetestexcept (FE_UNDERFLOW))
38 {
39 puts (s: "underflow exception not supported at runtime, cannot test");
40 return 0;
41 }
42 feclearexcept (FE_ALL_EXCEPT);
43 c = a * b;
44 if (fetestexcept (FE_UNDERFLOW))
45 {
46 if (TININESS_AFTER_ROUNDING)
47 {
48 puts (s: "tininess.h says after rounding, "
49 "but detected before rounding");
50 result = 1;
51 }
52 }
53 else
54 {
55 if (!TININESS_AFTER_ROUNDING)
56 {
57 puts (s: "tininess.h says before rounding, "
58 "but detected after rounding");
59 result = 1;
60 }
61 }
62#else
63 puts ("underflow exception not supported at compile time, cannot test");
64#endif
65 return result;
66}
67
68#define TEST_FUNCTION do_test ()
69#include "../test-skeleton.c"
70

source code of glibc/stdlib/tst-tininess.c