/*
* File: arch/blackfin/lib/muldi3.c
* Based on:
* Author:
*
* Created:
* Description:
*
* Modified:
* Copyright 2004-2006 Analog Devices Inc.
*
* Bugs: Enter bugs at http://blackfin.uclinux.org/
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef SI_TYPE_SIZE
#define SI_TYPE_SIZE 32
#endif
#define __ll_b (1L << (SI_TYPE_SIZE / 2))
#define __ll_lowpart(t) ((usitype) (t) % __ll_b)
#define __ll_highpart(t) ((usitype) (t) / __ll_b)
#define BITS_PER_UNIT 8
#if !defined(umul_ppmm)
#define umul_ppmm(w1, w0, u, v) \
do { \
usitype __x0, __x1, __x2, __x3; \
usitype __ul, __vl, __uh, __vh; \
\
__ul = __ll_lowpart (u); \
__uh = __ll_highpart (u); \
__vl = __ll_lowpart (v); \
__vh = __ll_highpart (v); \
\
__x0 = (usitype) __ul * __vl; \
__x1 = (usitype) __ul * __vh; \
__x2 = (usitype) __uh * __vl; \
__x3 = (usitype) __uh * __vh; \
\
__x1 += __ll_highpart (__x0);/* this can't give carry */ \
__x1 += __x2; /* but this indeed can */ \
if (__x1 < __x2) /* did we get it? */ \
__x3 += __ll_b; /* yes, add it in the proper pos. */ \
\
(w1) = __x3 + __ll_highpart (__x1); \
(w0) = __ll_lowpart (__x1) * __ll_b + __ll_lowpart (__x0); \
} while (0)
#endif
#if !defined(__umulsidi3)
#define __umulsidi3(u, v) \
({diunion __w; \
umul_ppmm (__w.s.high, __w.s.low, u, v); \
__w.ll; })
#endif
typedef unsigned int usitype __attribute__ ((mode(SI)));
typedef int sitype __attribute__ ((mode(SI)));
typedef int ditype __attribute__ ((mode(DI)));
typedef int word_type __attribute__ ((mode(__word__)));
struct distruct {
sitype low, high;
};
typedef union {
struct distruct s;
ditype ll;
} diunion;
#ifdef CONFIG_ARITHMETIC_OPS_L1
ditype __muldi3(ditype u, ditype v)__attribute__((l1_text));
#endif
ditype __muldi3(ditype u, ditype v)
{
diunion w;
diunion uu, vv;
uu.ll = u, vv.ll = v;
w.ll = __umulsidi3(uu.s.low, vv.s.low);
w.s.high += ((usitype) uu.s.low * (usitype) vv.s.high
+ (usitype) uu.s.high * (usitype) vv.s.low);
return w.ll;
}
