1 |
|
|
/* ===-- absvsi2.c - Implement __absvsi2 -----------------------------------=== |
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 __absvsi2 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 si_int |
22 |
|
|
__absvsi2(si_int a) |
23 |
|
|
{ |
24 |
|
|
const int N = (int)(sizeof(si_int) * CHAR_BIT); |
25 |
|
|
if (a == (1 << (N-1))) |
26 |
|
|
compilerrt_abort(); |
27 |
|
|
const si_int t = a >> (N - 1); |
28 |
|
|
return (a ^ t) - t; |
29 |
|
|
} |