| 1 | /*===-- absvdi2.c - Implement __absvdi2 -----------------------------------=== |
| 2 | * |
| 3 | * The LLVM Compiler Infrastructure |
| 4 | * |
| 5 | * This file is dual licensed under the MIT and the University of Illinois Open |
| 6 | * Source Licenses. See LICENSE.TXT for details. |
| 7 | * |
| 8 | *===----------------------------------------------------------------------=== |
| 9 | * |
| 10 | * This file implements __absvdi2 for the compiler_rt library. |
| 11 | * |
| 12 | *===----------------------------------------------------------------------=== |
| 13 | */ |
| 14 | |
| 15 | #include "int_lib.h" |
| 16 | |
| 17 | /* Returns: absolute value */ |
| 18 | |
| 19 | /* Effects: aborts if abs(x) < 0 */ |
| 20 | |
| 21 | COMPILER_RT_ABI di_int |
| 22 | __absvdi2(di_int a) |
| 23 | { |
| 24 | const int N = (int)(sizeof(di_int) * CHAR_BIT); |
| 25 | if (a == ((di_int)1 << (N-1))) |
| 26 | compilerrt_abort(); |
| 27 | const di_int t = a >> (N - 1); |
| 28 | return (a ^ t) - t; |
| 29 | } |
| 30 | |