| 1 | /* ===-- absvti2.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 __absvti2 for the compiler_rt library. |
| 11 | * |
| 12 | * ===----------------------------------------------------------------------=== |
| 13 | */ |
| 14 | |
| 15 | #include "int_lib.h" |
| 16 | |
| 17 | #ifdef CRT_HAS_128BIT |
| 18 | |
| 19 | /* Returns: absolute value */ |
| 20 | |
| 21 | /* Effects: aborts if abs(x) < 0 */ |
| 22 | |
| 23 | COMPILER_RT_ABI ti_int |
| 24 | __absvti2(ti_int a) |
| 25 | { |
| 26 | const int N = (int)(sizeof(ti_int) * CHAR_BIT); |
| 27 | if (a == ((ti_int)1 << (N-1))) |
| 28 | compilerrt_abort(); |
| 29 | const ti_int s = a >> (N - 1); |
| 30 | return (a ^ s) - s; |
| 31 | } |
| 32 | |
| 33 | #endif /* CRT_HAS_128BIT */ |
| 34 | |
| 35 | |