annotate gcc/ada/libgnat/s-casi64.adb @ 131:84e7813d76e9

gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
parents 04ced10e8804
children 1830386684a0
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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME LIBRARY COMPONENTS --
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4 -- --
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5 -- S Y S T E M . C O M P A R E _ A R R A Y _ S I G N E D _ 6 4 --
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6 -- --
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7 -- B o d y --
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8 -- --
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9 -- Copyright (C) 2002-2018, Free Software Foundation, Inc. --
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 with System.Address_Operations; use System.Address_Operations;
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33
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34 with Ada.Unchecked_Conversion;
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35
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36 package body System.Compare_Array_Signed_64 is
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37
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38 type Word is range -2**63 .. 2**63 - 1;
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39 for Word'Size use 64;
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40 -- Used to process operands by words
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41
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42 type Uword is new Word;
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43 for Uword'Alignment use 1;
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44 -- Used to process operands when unaligned
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45
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46 type WP is access Word;
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47 type UP is access Uword;
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48
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49 function W is new Ada.Unchecked_Conversion (Address, WP);
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50 function U is new Ada.Unchecked_Conversion (Address, UP);
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51
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52 -----------------------
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53 -- Compare_Array_S64 --
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54 -----------------------
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55
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56 function Compare_Array_S64
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57 (Left : System.Address;
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58 Right : System.Address;
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59 Left_Len : Natural;
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60 Right_Len : Natural) return Integer
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61 is
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62 Clen : Natural := Natural'Min (Left_Len, Right_Len);
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63 -- Number of elements left to compare
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64
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65 L : Address := Left;
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66 R : Address := Right;
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67 -- Pointers to next elements to compare
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68
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69 begin
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70 -- Case of going by aligned double words
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71
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72 if ModA (OrA (Left, Right), 8) = 0 then
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73 while Clen /= 0 loop
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74 if W (L).all /= W (R).all then
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75 if W (L).all > W (R).all then
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76 return +1;
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77 else
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78 return -1;
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79 end if;
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80 end if;
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81
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82 Clen := Clen - 1;
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83 L := AddA (L, 8);
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84 R := AddA (R, 8);
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85 end loop;
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86
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87 -- Case of going by unaligned double words
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88
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89 else
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90 while Clen /= 0 loop
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91 if U (L).all /= U (R).all then
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92 if U (L).all > U (R).all then
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93 return +1;
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94 else
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95 return -1;
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96 end if;
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97 end if;
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98
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99 Clen := Clen - 1;
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100 L := AddA (L, 8);
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101 R := AddA (R, 8);
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102 end loop;
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103 end if;
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104
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105 -- Here if common section equal, result decided by lengths
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106
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107 if Left_Len = Right_Len then
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108 return 0;
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109 elsif Left_Len > Right_Len then
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110 return +1;
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111 else
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112 return -1;
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113 end if;
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114 end Compare_Array_S64;
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115
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116 end System.Compare_Array_Signed_64;