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
17COMPILER_RT_ABI du_int __udivmoddi4(du_int a, du_int b, du_int* rem);
18
19/* Returns: a % b */
20
21COMPILER_RT_ABI di_int
22__moddi3(di_int a, di_int b)
23{
24    const int bits_in_dword_m1 = (int)(sizeof(di_int) * CHAR_BIT) - 1;
25    di_int s = b >> bits_in_dword_m1;  /* s = b < 0 ? -1 : 0 */
26    b = (b ^ s) - s;                   /* negate if s == -1 */
27    s = a >> bits_in_dword_m1;         /* s = a < 0 ? -1 : 0 */
28    a = (a ^ s) - s;                   /* negate if s == -1 */
29    di_int r;
30    __udivmoddi4(a, b, (du_int*)&r);
31    return (r ^ s) - s;                /* negate if s == -1 */
32}
33