1 /* Test of splitting a 'long double' into fraction and mantissa.
2 Copyright (C) 2007 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18 /* Written by Bruno Haible <bruno@clisp.org>, 2007. */
22 #include "printf-frexpl.h"
29 #define ASSERT(expr) if (!(expr)) abort ();
32 my_ldexp (long double x, int d)
46 DECL_LONG_DOUBLE_ROUNDING
48 BEGIN_LONG_DOUBLE_ROUNDING ();
50 for (i = 1, x = 1.0L; i <= LDBL_MAX_EXP; i++, x *= 2.0L)
53 long double mantissa = printf_frexpl (x, &exp);
54 ASSERT (exp == i - 1);
55 ASSERT (mantissa == 1.0L);
57 for (i = 1, x = 1.0L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
60 long double mantissa = printf_frexpl (x, &exp);
61 ASSERT (exp == i - 1);
62 ASSERT (mantissa == 1.0L);
64 for (; i >= LDBL_MIN_EXP - 100 && x > 0.0L; i--, x *= 0.5L)
67 long double mantissa = printf_frexpl (x, &exp);
68 ASSERT (exp == LDBL_MIN_EXP - 1);
69 ASSERT (mantissa == my_ldexp (1.0L, i - LDBL_MIN_EXP));
72 for (i = 1, x = 1.01L; i <= LDBL_MAX_EXP; i++, x *= 2.0L)
75 long double mantissa = printf_frexpl (x, &exp);
76 ASSERT (exp == i - 1);
77 ASSERT (mantissa == 1.01L);
79 for (i = 1, x = 1.01L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
82 long double mantissa = printf_frexpl (x, &exp);
83 ASSERT (exp == i - 1);
84 ASSERT (mantissa == 1.01L);
86 for (; i >= LDBL_MIN_EXP - 100 && x > 0.0L; i--, x *= 0.5L)
89 long double mantissa = printf_frexpl (x, &exp);
90 ASSERT (exp == LDBL_MIN_EXP - 1);
91 ASSERT (mantissa >= my_ldexp (1.0L, i - LDBL_MIN_EXP));
92 ASSERT (mantissa <= my_ldexp (2.0L, i - LDBL_MIN_EXP));
93 ASSERT (mantissa == my_ldexp (x, - exp));
96 for (i = 1, x = 1.73205L; i <= LDBL_MAX_EXP; i++, x *= 2.0L)
99 long double mantissa = printf_frexpl (x, &exp);
100 ASSERT (exp == i - 1);
101 ASSERT (mantissa == 1.73205L);
103 for (i = 1, x = 1.73205L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
106 long double mantissa = printf_frexpl (x, &exp);
107 ASSERT (exp == i - 1);
108 ASSERT (mantissa == 1.73205L);
110 for (; i >= LDBL_MIN_EXP - 100 && x > 0.0L; i--, x *= 0.5L)
113 long double mantissa = printf_frexpl (x, &exp);
114 ASSERT (exp == LDBL_MIN_EXP - 1);
115 ASSERT (mantissa >= my_ldexp (1.0L, i - LDBL_MIN_EXP));
116 ASSERT (mantissa <= my_ldexp (2.0L, i - LDBL_MIN_EXP));
117 ASSERT (mantissa == my_ldexp (x, - exp));