tsan: relax checking of errno spoiling in signal handlers
[blocksruntime.git] / lib / modti3.c
blob752202d45e017bf89064f61d86e9960d6aeb9257
1 /* ===-- modti3.c - Implement __modti3 -------------------------------------===
3 * The LLVM Compiler Infrastructure
5 * This file is dual licensed under the MIT and the University of Illinois Open
6 * Source Licenses. See LICENSE.TXT for details.
8 * ===----------------------------------------------------------------------===
10 * This file implements __modti3 for the compiler_rt library.
12 * ===----------------------------------------------------------------------===
15 #include "int_lib.h"
17 #if __x86_64
19 tu_int __udivmodti4(tu_int a, tu_int b, tu_int* rem);
21 /*Returns: a % b */
23 ti_int
24 __modti3(ti_int a, ti_int b)
26 const int bits_in_tword_m1 = (int)(sizeof(ti_int) * CHAR_BIT) - 1;
27 ti_int s = b >> bits_in_tword_m1; /* s = b < 0 ? -1 : 0 */
28 b = (b ^ s) - s; /* negate if s == -1 */
29 s = a >> bits_in_tword_m1; /* s = a < 0 ? -1 : 0 */
30 a = (a ^ s) - s; /* negate if s == -1 */
31 ti_int r;
32 __udivmodti4(a, b, (tu_int*)&r);
33 return (r ^ s) - s; /* negate if s == -1 */
36 #endif