Edward O'Callaghan | 37a6a45 | 2009-08-07 20:30:09 +0000 | [diff] [blame] | 1 | /*===-- absvdi2.c - Implement __absvdi2 -----------------------------------=== |
| 2 | * |
| 3 | * The LLVM Compiler Infrastructure |
| 4 | * |
Howard Hinnant | 9ad441f | 2010-11-16 22:13:33 +0000 | [diff] [blame] | 5 | * This file is dual licensed under the MIT and the University of Illinois Open |
| 6 | * Source Licenses. See LICENSE.TXT for details. |
Edward O'Callaghan | 37a6a45 | 2009-08-07 20:30:09 +0000 | [diff] [blame] | 7 | * |
| 8 | *===----------------------------------------------------------------------=== |
| 9 | * |
| 10 | * This file implements __absvdi2 for the compiler_rt library. |
| 11 | * |
| 12 | *===----------------------------------------------------------------------=== |
| 13 | */ |
Anton Korobeynikov | 1c5f89b | 2011-04-19 17:52:09 +0000 | [diff] [blame^] | 14 | #include "abi.h" |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 15 | |
| 16 | #include "int_lib.h" |
| 17 | #include <stdlib.h> |
| 18 | |
Edward O'Callaghan | 37a6a45 | 2009-08-07 20:30:09 +0000 | [diff] [blame] | 19 | /* Returns: absolute value */ |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 20 | |
Edward O'Callaghan | 37a6a45 | 2009-08-07 20:30:09 +0000 | [diff] [blame] | 21 | /* Effects: aborts if abs(x) < 0 */ |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 22 | |
Anton Korobeynikov | 1c5f89b | 2011-04-19 17:52:09 +0000 | [diff] [blame^] | 23 | COMPILER_RT_ABI di_int |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 24 | __absvdi2(di_int a) |
| 25 | { |
| 26 | const int N = (int)(sizeof(di_int) * CHAR_BIT); |
| 27 | if (a == ((di_int)1 << (N-1))) |
Daniel Dunbar | 48f46ac | 2010-03-31 17:00:45 +0000 | [diff] [blame] | 28 | compilerrt_abort(); |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 29 | const di_int t = a >> (N - 1); |
| 30 | return (a ^ t) - t; |
| 31 | } |