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6de9cd9a | 1 | /* Implementation of ishftc intrinsic. |
56746a07 | 2 | Copyright 2002, 2004 Free Software Foundation, Inc. |
6de9cd9a DN |
3 | Contributed by Paul Brook <paul@nowt.org> |
4 | ||
57dea9f6 | 5 | This file is part of the GNU Fortran 95 runtime library (libgfortran). |
6de9cd9a DN |
6 | |
7 | Libgfortran is free software; you can redistribute it and/or | |
57dea9f6 | 8 | modify it under the terms of the GNU General Public |
6de9cd9a | 9 | License as published by the Free Software Foundation; either |
57dea9f6 TM |
10 | version 2 of the License, or (at your option) any later version. |
11 | ||
12 | In addition to the permissions in the GNU General Public License, the | |
13 | Free Software Foundation gives you unlimited permission to link the | |
14 | compiled version of this file into combinations with other programs, | |
15 | and to distribute those combinations without any restriction coming | |
16 | from the use of this file. (The General Public License restrictions | |
17 | do apply in other respects; for example, they cover modification of | |
18 | the file, and distribution when not linked into a combine | |
19 | executable.) | |
6de9cd9a DN |
20 | |
21 | Libgfortran is distributed in the hope that it will be useful, | |
22 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
57dea9f6 | 24 | GNU General Public License for more details. |
6de9cd9a | 25 | |
57dea9f6 TM |
26 | You should have received a copy of the GNU General Public |
27 | License along with libgfortran; see the file COPYING. If not, | |
6de9cd9a DN |
28 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
29 | Boston, MA 02111-1307, USA. */ | |
30 | ||
31 | #include "libgfortran.h" | |
32 | ||
7d7b8bfe RH |
33 | extern GFC_INTEGER_4 ishftc4 (GFC_INTEGER_4, GFC_INTEGER_4, GFC_INTEGER_4); |
34 | export_proto(ishftc4); | |
6de9cd9a DN |
35 | |
36 | GFC_INTEGER_4 | |
37 | ishftc4 (GFC_INTEGER_4 i, GFC_INTEGER_4 shift, GFC_INTEGER_4 size) | |
38 | { | |
39 | GFC_INTEGER_4 mask; | |
40 | GFC_UINTEGER_4 bits; | |
41 | ||
42 | if (shift < 0) | |
43 | shift = shift + size; | |
44 | ||
45 | if (shift == 0 || shift == size) | |
46 | return i; | |
47 | ||
48 | mask = (~(GFC_INTEGER_4)0) << size; | |
49 | bits = i & ~mask; | |
50 | return (i & mask) | (bits >> (size - shift)) | ((i << shift) & ~mask); | |
51 | } | |
52 | ||
56746a07 | 53 | extern GFC_INTEGER_8 ishftc8 (GFC_INTEGER_8, GFC_INTEGER_4, GFC_INTEGER_4); |
7d7b8bfe | 54 | export_proto(ishftc8); |
6de9cd9a DN |
55 | |
56 | GFC_INTEGER_8 | |
56746a07 | 57 | ishftc8 (GFC_INTEGER_8 i, GFC_INTEGER_4 shift, GFC_INTEGER_4 size) |
6de9cd9a DN |
58 | { |
59 | GFC_INTEGER_8 mask; | |
60 | GFC_UINTEGER_8 bits; | |
61 | ||
62 | if (shift < 0) | |
63 | shift = shift + size; | |
64 | ||
65 | if (shift == 0 || shift == size) | |
66 | return i; | |
67 | ||
68 | mask = (~(GFC_INTEGER_8)0) << size; | |
69 | bits = i & ~mask; | |
70 | return (i & mask) | (bits >> (size - shift)) | ((i << shift) & ~mask); | |
71 | } |