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 
21 COMPILER_RT_ABI ti_int
__modti3(ti_int a,ti_int b)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