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1e57a462 | 1 | /** @file\r |
2 | \r | |
3 | Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r | |
3402aac7 | 4 | \r |
1e57a462 | 5 | This program and the accompanying materials\r |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | **/\r | |
14 | /**\r | |
15 | University of Illinois/NCSA\r | |
16 | Open Source License\r | |
3402aac7 | 17 | \r |
1e57a462 | 18 | Copyright (c) 2003-2008 University of Illinois at Urbana-Champaign.\r |
19 | All rights reserved.\r | |
3402aac7 | 20 | \r |
1e57a462 | 21 | Developed by:\r |
3402aac7 | 22 | \r |
1e57a462 | 23 | LLVM Team\r |
3402aac7 | 24 | \r |
1e57a462 | 25 | University of Illinois at Urbana-Champaign\r |
3402aac7 | 26 | \r |
1e57a462 | 27 | http://llvm.org\r |
3402aac7 | 28 | \r |
1e57a462 | 29 | Permission is hereby granted, free of charge, to any person obtaining a copy of\r |
30 | this software and associated documentation files (the "Software"), to deal with\r | |
31 | the Software without restriction, including without limitation the rights to\r | |
32 | use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies\r | |
33 | of the Software, and to permit persons to whom the Software is furnished to do\r | |
34 | so, subject to the following conditions:\r | |
3402aac7 | 35 | \r |
1e57a462 | 36 | * Redistributions of source code must retain the above copyright notice,\r |
37 | this list of conditions and the following disclaimers.\r | |
3402aac7 | 38 | \r |
1e57a462 | 39 | * Redistributions in binary form must reproduce the above copyright notice,\r |
40 | this list of conditions and the following disclaimers in the\r | |
41 | documentation and/or other materials provided with the distribution.\r | |
3402aac7 | 42 | \r |
1e57a462 | 43 | * Neither the names of the LLVM Team, University of Illinois at\r |
44 | Urbana-Champaign, nor the names of its contributors may be used to\r | |
45 | endorse or promote products derived from this Software without specific\r | |
46 | prior written permission.\r | |
3402aac7 | 47 | \r |
1e57a462 | 48 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r |
49 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS\r | |
50 | FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r | |
51 | CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r | |
52 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r | |
53 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE\r | |
54 | SOFTWARE.\r | |
55 | **/\r | |
56 | \r | |
57 | #include "Llvm_int_lib.h"\r | |
58 | \r | |
59 | // Returns: logical a >> b\r | |
60 | \r | |
61 | // Precondition: 0 <= b < bits_in_dword\r | |
62 | \r | |
63 | INT64\r | |
64 | __lshrdi3(INT64 a, INT32 b)\r | |
65 | {\r | |
66 | const int bits_in_word = (int)(sizeof(INT32) * CHAR_BIT);\r | |
67 | udwords input;\r | |
68 | udwords result;\r | |
69 | input.all = a;\r | |
70 | if (b & bits_in_word) // bits_in_word <= b < bits_in_dword\r | |
71 | {\r | |
72 | result.high = 0;\r | |
73 | result.low = input.high >> (b - bits_in_word);\r | |
74 | }\r | |
75 | else // 0 <= b < bits_in_word\r | |
76 | {\r | |
77 | if (b == 0)\r | |
78 | return a;\r | |
79 | result.high = input.high >> b;\r | |
80 | result.low = (input.high << (bits_in_word - b)) | (input.low >> b);\r | |
81 | }\r | |
82 | return result.all;\r | |
83 | }\r |