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 | |