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 |
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 | |