1 |
|
|
/* ===-- divdi3.c - Implement __divdi3 -------------------------------------=== |
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 __divdi3 for the compiler_rt library. |
11 |
|
|
* |
12 |
|
|
* ===----------------------------------------------------------------------=== |
13 |
|
|
*/ |
14 |
|
|
|
15 |
|
|
#include "int_lib.h" |
16 |
|
|
|
17 |
|
|
/* Returns: a / b */ |
18 |
|
|
|
19 |
|
|
COMPILER_RT_ABI di_int |
20 |
|
|
__divdi3(di_int a, di_int b) |
21 |
|
|
{ |
22 |
|
|
const int bits_in_dword_m1 = (int)(sizeof(di_int) * CHAR_BIT) - 1; |
23 |
|
|
di_int s_a = a >> bits_in_dword_m1; /* s_a = a < 0 ? -1 : 0 */ |
24 |
|
|
di_int s_b = b >> bits_in_dword_m1; /* s_b = b < 0 ? -1 : 0 */ |
25 |
|
|
a = (a ^ s_a) - s_a; /* negate if s_a == -1 */ |
26 |
|
|
b = (b ^ s_b) - s_b; /* negate if s_b == -1 */ |
27 |
|
|
s_a ^= s_b; /*sign of quotient */ |
28 |
|
|
return (__udivmoddi4(a, b, (du_int*)0) ^ s_a) - s_a; /* negate if s_a == -1 */ |
29 |
|
|
} |