1 /*===-- moddi3.c - Implement __moddi3 -------------------------------------===
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 __moddi3 for the compiler_rt library.
11  *
12  * ===----------------------------------------------------------------------===
13  */
14 
15 #include "int_lib.h"
16 
17 /* Returns: a % b */
18 
19 di_int
__moddi3(di_int a,di_int b)20 __moddi3(di_int a, di_int b)
21 {
22     const int bits_in_dword_m1 = (int)(sizeof(di_int) * CHAR_BIT) - 1;
23     di_int s = b >> bits_in_dword_m1;  /* s = b < 0 ? -1 : 0 */
24     b = (b ^ s) - s;                   /* negate if s == -1 */
25     s = a >> bits_in_dword_m1;         /* s = a < 0 ? -1 : 0 */
26     a = (a ^ s) - s;                   /* negate if s == -1 */
27     du_int r;
28     __udivmoddi4(a, b, &r);
29     return ((di_int)r ^ s) - s;                /* negate if s == -1 */
30 }
31