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1 /* Implementation of ishftc intrinsic.
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2 Copyright (C) 2002-2020 Free Software Foundation, Inc.
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3 Contributed by Paul Brook <paul@nowt.org>
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4
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5 This file is part of the GNU Fortran 95 runtime library (libgfortran).
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6
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7 Libgfortran is free software; you can redistribute it and/or
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8 modify it under the terms of the GNU General Public
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9 License as published by the Free Software Foundation; either
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10 version 3 of the License, or (at your option) any later version.
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11
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12 Libgfortran is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 Under Section 7 of GPL version 3, you are granted additional
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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21 You should have received a copy of the GNU General Public License and
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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26 #include "libgfortran.h"
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27
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28 extern GFC_INTEGER_4 ishftc4 (GFC_INTEGER_4, GFC_INTEGER_4, GFC_INTEGER_4);
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29 export_proto(ishftc4);
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30
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31 GFC_INTEGER_4
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32 ishftc4 (GFC_INTEGER_4 i, GFC_INTEGER_4 shift, GFC_INTEGER_4 size)
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33 {
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34 GFC_UINTEGER_4 mask, bits;
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35
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36 if (shift < 0)
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37 shift = shift + size;
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38
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39 if (shift == 0 || shift == size)
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40 return i;
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41
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42 /* In C, the result of the shift operator is undefined if the right operand
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43 is greater than or equal to the number of bits in the left operand. So we
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44 have to special case it for fortran. */
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45 mask = ~((size == 32) ? (GFC_UINTEGER_4)0 : (~(GFC_UINTEGER_4)0 << size));
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46
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47 bits = i & mask;
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48
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49 return (i & ~mask) | ((bits << shift) & mask) | (bits >> (size - shift));
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50 }
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51
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52 extern GFC_INTEGER_8 ishftc8 (GFC_INTEGER_8, GFC_INTEGER_4, GFC_INTEGER_4);
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53 export_proto(ishftc8);
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54
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55 GFC_INTEGER_8
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56 ishftc8 (GFC_INTEGER_8 i, GFC_INTEGER_4 shift, GFC_INTEGER_4 size)
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57 {
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58 GFC_UINTEGER_8 mask, bits;
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59
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60 if (shift < 0)
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61 shift = shift + size;
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62
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63 if (shift == 0 || shift == size)
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64 return i;
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65
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66 /* In C, the result of the shift operator is undefined if the right operand
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67 is greater than or equal to the number of bits in the left operand. So we
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68 have to special case it for fortran. */
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69 mask = ~((size == 64) ? (GFC_UINTEGER_8)0 : (~(GFC_UINTEGER_8)0 << size));
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70
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71 bits = i & mask;
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72
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73 return (i & ~mask) | ((bits << shift) & mask) | (bits >> (size - shift));
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74 }
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75
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76 #ifdef HAVE_GFC_INTEGER_16
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77 extern GFC_INTEGER_16 ishftc16 (GFC_INTEGER_16, GFC_INTEGER_4, GFC_INTEGER_4);
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78 export_proto(ishftc16);
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79
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80 GFC_INTEGER_16
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81 ishftc16 (GFC_INTEGER_16 i, GFC_INTEGER_4 shift, GFC_INTEGER_4 size)
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82 {
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83 GFC_UINTEGER_16 mask, bits;
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84
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85 if (shift < 0)
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86 shift = shift + size;
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87
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88 if (shift == 0 || shift == size)
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89 return i;
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90
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91 /* In C, the result of the shift operator is undefined if the right operand
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92 is greater than or equal to the number of bits in the left operand. So we
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93 have to special case it for fortran. */
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94 mask = ~((size == 128) ? (GFC_UINTEGER_16)0 : (~(GFC_UINTEGER_16)0 << size));
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95
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96 bits = i & mask;
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97
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98 return (i & ~mask) | ((bits << shift) & mask) | (bits >> (size - shift));
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99 }
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100 #endif
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