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
58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
/* ===-- muldi3.c - Implement __muldi3 -------------------------------------===
|
|
*
|
|
* 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 __muldi3 for the compiler_rt library.
|
|
*
|
|
* ===----------------------------------------------------------------------===
|
|
*/
|
|
#include "abi.h"
|
|
|
|
#include "int_lib.h"
|
|
|
|
/* Returns: a * b */
|
|
|
|
static
|
|
di_int
|
|
__muldsi3(su_int a, su_int b)
|
|
{
|
|
dwords r;
|
|
const int bits_in_word_2 = (int)(sizeof(si_int) * CHAR_BIT) / 2;
|
|
const su_int lower_mask = (su_int)~0 >> bits_in_word_2;
|
|
r.s.low = (a & lower_mask) * (b & lower_mask);
|
|
su_int t = r.s.low >> bits_in_word_2;
|
|
r.s.low &= lower_mask;
|
|
t += (a >> bits_in_word_2) * (b & lower_mask);
|
|
r.s.low += (t & lower_mask) << bits_in_word_2;
|
|
r.s.high = t >> bits_in_word_2;
|
|
t = r.s.low >> bits_in_word_2;
|
|
r.s.low &= lower_mask;
|
|
t += (b >> bits_in_word_2) * (a & lower_mask);
|
|
r.s.low += (t & lower_mask) << bits_in_word_2;
|
|
r.s.high += t >> bits_in_word_2;
|
|
r.s.high += (a >> bits_in_word_2) * (b >> bits_in_word_2);
|
|
return r.all;
|
|
}
|
|
|
|
/* Returns: a * b */
|
|
|
|
ARM_EABI_FNALIAS(lmul, muldi3);
|
|
|
|
COMPILER_RT_ABI di_int
|
|
__muldi3(di_int a, di_int b)
|
|
{
|
|
dwords x;
|
|
x.all = a;
|
|
dwords y;
|
|
y.all = b;
|
|
dwords r;
|
|
r.all = __muldsi3(x.s.low, y.s.low);
|
|
r.s.high += x.s.high * y.s.low + x.s.low * y.s.high;
|
|
return r.all;
|
|
}
|