blob: 3ab82f0febe5fcdd9c720ab4a21884f1940d7260 [file] [log] [blame]
/* ===-- divsi3.c - Implement __divsi3 -------------------------------------===
*
* The LLVM Compiler Infrastructure
*
* This file is distributed under the University of Illinois Open Source
* License. See LICENSE.TXT for details.
*
* ===----------------------------------------------------------------------===
*
* This file implements __divsi3 for the compiler_rt library.
*
* ===----------------------------------------------------------------------===
*/
#if !defined(__GNUC__) || __GNUC__ < 4 || \
(__GNUC__ == 4 && __GNUC_MINOR__ < 8 && !defined(HAS_HW_DIV))
// gcc >= 4.8 implements this in libgcc
// gcc 4.7 also implements this in libgcc with -mcpu=cortex-a15
#include "int_lib.h"
su_int __udivsi3(su_int n, su_int d);
/* Returns: a / b */
si_int
__divsi3(si_int a, si_int b)
{
const int bits_in_word_m1 = (int)(sizeof(si_int) * CHAR_BIT) - 1;
si_int s_a = a >> bits_in_word_m1; /* s_a = a < 0 ? -1 : 0 */
si_int s_b = b >> bits_in_word_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 (__udivsi3(a, b) ^ s_a) - s_a; /* negate if s_a == -1 */
}
#endif