ef8821e5db
It seems there have only been a small amount to the compiler-rt source code in the mean time. I'd rather have the code in sync as much as possible by the time we release 9.0. Changes: - The libcompiler_rt library is now dual licensed under both the University of Illinois "BSD-Like" license and the MIT license. - Our local modifications for using .hidden instead of .private_extern have been upstreamed, meaning our changes to lib/assembly.h can now be reverted. - A possible endless recursion in __modsi3() has been fixed. - Support for ARM EABI has been added, but it has no effect on FreeBSD (yet). - The functions __udivmodsi4 and __divmodsi4 have been added. Requested by: many, including bf@ and Pedro Giffuni
36 lines
1.2 KiB
C
36 lines
1.2 KiB
C
/* ===-- divti3.c - Implement __divti3 -------------------------------------===
|
|
*
|
|
* 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 __divti3 for the compiler_rt library.
|
|
*
|
|
* ===----------------------------------------------------------------------===
|
|
*/
|
|
|
|
#if __x86_64
|
|
|
|
#include "int_lib.h"
|
|
|
|
tu_int __udivmodti4(tu_int a, tu_int b, tu_int* rem);
|
|
|
|
/* Returns: a / b */
|
|
|
|
ti_int
|
|
__divti3(ti_int a, ti_int b)
|
|
{
|
|
const int bits_in_tword_m1 = (int)(sizeof(ti_int) * CHAR_BIT) - 1;
|
|
ti_int s_a = a >> bits_in_tword_m1; /* s_a = a < 0 ? -1 : 0 */
|
|
ti_int s_b = b >> bits_in_tword_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 (__udivmodti4(a, b, (tu_int*)0) ^ s_a) - s_a; /* negate if s_a == -1 */
|
|
}
|
|
|
|
#endif
|