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1 | /** @file |
2 | Compiler intrinsic for 64-bit compare, ported from LLVM code. | |
3 | ||
d6ebcab7 | 4 | Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR> |
2ef2b01e | 5 | |
d6ebcab7 | 6 | This program and the accompanying materials |
2ef2b01e A |
7 | are licensed and made available under the terms and conditions of the BSD License |
8 | which accompanies this distribution. The full text of the license may be found at | |
9 | http://opensource.org/licenses/bsd-license.php | |
10 | ||
11 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
12 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
13 | ||
14 | **/ | |
15 | /** | |
16 | University of Illinois/NCSA | |
17 | Open Source License | |
18 | ||
19 | Copyright (c) 2003-2008 University of Illinois at Urbana-Champaign. | |
20 | All rights reserved. | |
21 | ||
22 | Developed by: | |
23 | ||
24 | LLVM Team | |
25 | ||
26 | University of Illinois at Urbana-Champaign | |
27 | ||
28 | http://llvm.org | |
29 | ||
30 | Permission is hereby granted, free of charge, to any person obtaining a copy of | |
31 | this software and associated documentation files (the "Software"), to deal with | |
32 | the Software without restriction, including without limitation the rights to | |
33 | use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies | |
34 | of the Software, and to permit persons to whom the Software is furnished to do | |
35 | so, subject to the following conditions: | |
36 | ||
37 | * Redistributions of source code must retain the above copyright notice, | |
38 | this list of conditions and the following disclaimers. | |
39 | ||
40 | * Redistributions in binary form must reproduce the above copyright notice, | |
41 | this list of conditions and the following disclaimers in the | |
42 | documentation and/or other materials provided with the distribution. | |
43 | ||
44 | * Neither the names of the LLVM Team, University of Illinois at | |
45 | Urbana-Champaign, nor the names of its contributors may be used to | |
46 | endorse or promote products derived from this Software without specific | |
47 | prior written permission. | |
48 | ||
49 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
50 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS | |
51 | FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
52 | CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
53 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
54 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE | |
55 | SOFTWARE. | |
56 | **/ | |
57 | ||
58 | ||
59 | #include "Llvm_int_lib.h" | |
60 | ||
61 | UINT64 __udivmoddi4(UINT64 a, UINT64 b, UINT64* rem); | |
62 | ||
63 | // Returns: a / b | |
64 | ||
65 | INT64 | |
66 | __divdi3(INT64 a, INT64 b) | |
67 | { | |
68 | const int bits_in_dword_m1 = (int)(sizeof(INT64) * CHAR_BIT) - 1; | |
69 | INT64 s_a = a >> bits_in_dword_m1; // s_a = a < 0 ? -1 : 0 | |
70 | INT64 s_b = b >> bits_in_dword_m1; // s_b = b < 0 ? -1 : 0 | |
71 | a = (a ^ s_a) - s_a; // negate if s_a == -1 | |
72 | b = (b ^ s_b) - s_b; // negate if s_b == -1 | |
73 | s_a ^= s_b; // sign of quotient | |
74 | return (__udivmoddi4(a, b, (UINT64*)0) ^ s_a) - s_a; // negate if s_a == -1 | |
75 | } | |
76 | ||
77 |