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1 | /** @file\r |
2 | Compiler intrinsic for 32--bit unsigned division, ported from LLVM code.\r |
3 | \r |
4 | \r |
5 | Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r |
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6 | \r |
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7 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
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8 | \r |
9 | **/\r |
10 | /**\r |
11 | University of Illinois/NCSA\r |
12 | Open Source License\r |
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13 | \r |
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14 | Copyright (c) 2003-2008 University of Illinois at Urbana-Champaign.\r |
15 | All rights reserved.\r |
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16 | \r |
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17 | Developed by:\r |
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18 | \r |
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19 | LLVM Team\r |
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20 | \r |
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21 | University of Illinois at Urbana-Champaign\r |
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22 | \r |
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23 | http://llvm.org\r |
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24 | \r |
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25 | Permission is hereby granted, free of charge, to any person obtaining a copy of\r |
26 | this software and associated documentation files (the "Software"), to deal with\r |
27 | the Software without restriction, including without limitation the rights to\r |
28 | use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies\r |
29 | of the Software, and to permit persons to whom the Software is furnished to do\r |
30 | so, subject to the following conditions:\r |
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31 | \r |
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32 | * Redistributions of source code must retain the above copyright notice,\r |
33 | this list of conditions and the following disclaimers.\r |
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34 | \r |
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35 | * Redistributions in binary form must reproduce the above copyright notice,\r |
36 | this list of conditions and the following disclaimers in the\r |
37 | documentation and/or other materials provided with the distribution.\r |
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38 | \r |
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39 | * Neither the names of the LLVM Team, University of Illinois at\r |
40 | Urbana-Champaign, nor the names of its contributors may be used to\r |
41 | endorse or promote products derived from this Software without specific\r |
42 | prior written permission.\r |
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43 | \r |
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44 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r |
45 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS\r |
46 | FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\r |
47 | CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\r |
48 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\r |
49 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE\r |
50 | SOFTWARE.\r |
51 | **/\r |
52 | \r |
53 | \r |
54 | #include "Llvm_int_lib.h"\r |
55 | \r |
56 | UINT32 __udivsi3(UINT32 n, UINT32 d);\r |
57 | \r |
58 | // Returns: a / b\r |
59 | \r |
60 | INT32\r |
61 | __divsi3(INT32 a, INT32 b)\r |
62 | {\r |
63 | const int bits_in_word_m1 = (int)(sizeof(INT32) * CHAR_BIT) - 1;\r |
64 | INT32 s_a = a >> bits_in_word_m1; // s_a = a < 0 ? -1 : 0\r |
65 | INT32 s_b = b >> bits_in_word_m1; // s_b = b < 0 ? -1 : 0\r |
66 | a = (a ^ s_a) - s_a; // negate if s_a == -1\r |
67 | b = (b ^ s_b) - s_b; // negate if s_b == -1\r |
68 | s_a ^= s_b; // sign of quotient\r |
69 | return (__udivsi3(a, b) ^ s_a) - s_a; // negate if s_a == -1\r |
70 | }\r |
71 | \r |
72 | \r |