48 строки
1.7 KiB
C
48 строки
1.7 KiB
C
/* ===-- divdi3.c - Implement __divdi3 -------------------------------------===
|
|
*
|
|
* The LLVM Compiler Infrastructure
|
|
*
|
|
* This file is dual licensed under the MIT and the University of Illinois Open
|
|
* Source Licenses. See LICENSE.TXT for details.
|
|
*
|
|
* ===----------------------------------------------------------------------===
|
|
*
|
|
* This file implements __divdi3 for the compiler_rt library.
|
|
*
|
|
* ===----------------------------------------------------------------------===
|
|
*/
|
|
|
|
#include "int_lib.h"
|
|
|
|
du_int COMPILER_RT_ABI __udivmoddi4(du_int a, du_int b, du_int* rem);
|
|
|
|
/* Returns: a / b */
|
|
|
|
COMPILER_RT_ABI di_int
|
|
__divdi3(di_int a, di_int b)
|
|
{
|
|
const int bits_in_dword_m1 = (int)(sizeof(di_int) * CHAR_BIT) - 1;
|
|
di_int s_a = a >> bits_in_dword_m1; /* s_a = a < 0 ? -1 : 0 */
|
|
di_int s_b = b >> bits_in_dword_m1; /* s_b = b < 0 ? -1 : 0 */
|
|
a = (a ^ s_a) - s_a; /* negate if s_a == -1 */
|
|
b = (b ^ s_b) - s_b; /* negate if s_b == -1 */
|
|
s_a ^= s_b; /*sign of quotient */
|
|
return (__udivmoddi4(a, b, (du_int*)0) ^ s_a) - s_a; /* negate if s_a == -1 */
|
|
}
|
|
|
|
/* XXX EMSCRIPTEN */
|
|
|
|
COMPILER_RT_ABI di_int
|
|
__remdi3(di_int a, di_int b)
|
|
{
|
|
const int bits_in_dword_m1 = (int)(sizeof(di_int) * CHAR_BIT) - 1;
|
|
di_int s_a = a >> bits_in_dword_m1; /* s_a = a < 0 ? -1 : 0 */
|
|
di_int s_b = b >> bits_in_dword_m1; /* s_b = b < 0 ? -1 : 0 */
|
|
a = (a ^ s_a) - s_a; /* negate if s_a == -1 */
|
|
b = (b ^ s_b) - s_b; /* negate if s_b == -1 */
|
|
du_int rem;
|
|
__udivmoddi4(a, b, &rem);
|
|
return (rem ^ s_a) - s_a; /* negate if s_a == -1 */
|
|
}
|
|
|