1/* ===-- modti3.c - Implement __modti3 -------------------------------------===
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 __modti3 for the compiler_rt library.
11 *
12 * ===----------------------------------------------------------------------===
13 */
14
15#include "int_lib.h"
16
17#ifdef CRT_HAS_128BIT
18
19/*Returns: a % b */
20
21COMPILER_RT_ABI ti_int
22__modti3(ti_int a, ti_int b)
23{
24    const int bits_in_tword_m1 = (int)(sizeof(ti_int) * CHAR_BIT) - 1;
25    ti_int s = b >> bits_in_tword_m1;  /* s = b < 0 ? -1 : 0 */
26    b = (b ^ s) - s;                   /* negate if s == -1 */
27    s = a >> bits_in_tword_m1;         /* s = a < 0 ? -1 : 0 */
28    a = (a ^ s) - s;                   /* negate if s == -1 */
29    tu_int r;
30    __udivmodti4(a, b, &r);
31    return ((ti_int)r ^ s) - s;                /* negate if s == -1 */
32}
33
34#endif /* CRT_HAS_128BIT */
35