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
19COMPILER_RT_ABI di_int
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