1 /* mpfr_pow_uj -- compute the power of a floating-point by a uintmax_t
2
3 Copyright 2021-2023 Free Software Foundation, Inc.
4 Contributed by the AriC and Caramba projects, INRIA.
5
6 This file is part of the GNU MPFR Library.
7
8 The GNU MPFR Library is free software; you can redistribute it and/or modify
9 it under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or (at your
11 option) any later version.
12
13 The GNU MPFR Library is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
16 License for more details.
17
18 You should have received a copy of the GNU Lesser General Public License
19 along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see
20 https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
21 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
22
23 #define MPFR_NEED_LONGLONG_H
24 #define MPFR_NEED_INTMAX_H
25 #include "mpfr-impl.h"
26
27 #ifdef _MPFR_H_HAVE_INTMAX_T
28
29 #define POW_U mpfr_pow_uj
30 #define MPZ_SET_U mpfr_mpz_set_uj
31 #define UTYPE uintmax_t
32 #define FSPEC "j"
33
34 #define ULONG_BITS (sizeof (unsigned long) * CHAR_BIT)
35
36 /* z <- n, assuming uintmax_t is at most twice as wide as unsigned long
37 and assume no padding bits.
38 FIXME: code should be shared with mpfr_set_uj_2exp to avoid such
39 limitations (and this could be more efficient).
40 */
41 static void
mpfr_mpz_set_uj(mpz_t z,uintmax_t n)42 mpfr_mpz_set_uj (mpz_t z, uintmax_t n)
43 {
44 if ((unsigned long) n == n)
45 mpz_set_ui (z, n);
46 else
47 {
48 uintmax_t h = (n >> (ULONG_BITS - 1)) >> 1;
49 /* equivalent to n >> ULONG_BITS, as a workaround to GCC bug 4210
50 "should not warn in dead code". */
51
52 MPFR_ASSERTN ((unsigned long) h == h);
53
54 mpz_set_ui (z, (unsigned long) h);
55 mpz_mul_2exp (z, z, ULONG_BITS);
56 mpz_add_ui (z, z, (unsigned long) n);
57 }
58 }
59
60 #include "pow_ui.c"
61
62 #endif
63