118 lines
2.0 KiB
C
118 lines
2.0 KiB
C
/* Copyright (C) 2012-2019 Free Software Foundation, Inc.
|
|
Contributed by Altera and Mentor Graphics, Inc.
|
|
|
|
This file is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU General Public License as published by the
|
|
Free Software Foundation; either version 3, or (at your option) any
|
|
later version.
|
|
|
|
This file is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
General Public License for more details.
|
|
|
|
Under Section 7 of GPL version 3, you are granted additional
|
|
permissions described in the GCC Runtime Library Exception, version
|
|
3.1, as published by the Free Software Foundation.
|
|
|
|
You should have received a copy of the GNU General Public License and
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include "lib2-nios2.h"
|
|
|
|
/* 32-bit SI divide and modulo as used in Nios II. */
|
|
|
|
static USItype
|
|
udivmodsi4 (USItype num, USItype den, word_type modwanted)
|
|
{
|
|
USItype bit = 1;
|
|
USItype res = 0;
|
|
|
|
while (den < num && bit && !(den & (1L<<31)))
|
|
{
|
|
den <<=1;
|
|
bit <<=1;
|
|
}
|
|
while (bit)
|
|
{
|
|
if (num >= den)
|
|
{
|
|
num -= den;
|
|
res |= bit;
|
|
}
|
|
bit >>=1;
|
|
den >>=1;
|
|
}
|
|
if (modwanted)
|
|
return num;
|
|
return res;
|
|
}
|
|
|
|
|
|
SItype
|
|
__divsi3 (SItype a, SItype b)
|
|
{
|
|
word_type neg = 0;
|
|
SItype res;
|
|
|
|
if (a < 0)
|
|
{
|
|
a = -a;
|
|
neg = !neg;
|
|
}
|
|
|
|
if (b < 0)
|
|
{
|
|
b = -b;
|
|
neg = !neg;
|
|
}
|
|
|
|
res = udivmodsi4 (a, b, 0);
|
|
|
|
if (neg)
|
|
res = -res;
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
SItype
|
|
__modsi3 (SItype a, SItype b)
|
|
{
|
|
word_type neg = 0;
|
|
SItype res;
|
|
|
|
if (a < 0)
|
|
{
|
|
a = -a;
|
|
neg = 1;
|
|
}
|
|
|
|
if (b < 0)
|
|
b = -b;
|
|
|
|
res = udivmodsi4 (a, b, 1);
|
|
|
|
if (neg)
|
|
res = -res;
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
SItype
|
|
__udivsi3 (SItype a, SItype b)
|
|
{
|
|
return udivmodsi4 (a, b, 0);
|
|
}
|
|
|
|
|
|
SItype
|
|
__umodsi3 (SItype a, SItype b)
|
|
{
|
|
return udivmodsi4 (a, b, 1);
|
|
}
|
|
|