aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/cxxsupp/builtins/absvdi2.c
blob: f87098395ac465cc72eaf1741e2ab6affc4884d1 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
/*===-- absvdi2.c - Implement __absvdi2 -----------------------------------=== 
 * 
 *                     The LLVM Compiler Infrastructure 
 * 
 * This file is dual licensed under the MIT and the University of Illinois Open 
 * Source Licenses. See LICENSE.TXT for details. 
 * 
 *===----------------------------------------------------------------------=== 
 * 
 * This file implements __absvdi2 for the compiler_rt library. 
 * 
 *===----------------------------------------------------------------------=== 
 */ 
 
#include "int_lib.h" 
 
/* Returns: absolute value */ 
 
/* Effects: aborts if abs(x) < 0 */ 
 
COMPILER_RT_ABI di_int 
__absvdi2(di_int a) 
{ 
    const int N = (int)(sizeof(di_int) * CHAR_BIT); 
    if (a == ((di_int)1 << (N-1))) 
        compilerrt_abort(); 
    const di_int t = a >> (N - 1); 
    return (a ^ t) - t; 
}