100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
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/*
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* File: arch/blackfin/lib/muldi3.c
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* Based on:
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* Author:
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*
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* Created:
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* Description:
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*
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* Modified:
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* Copyright 2004-2006 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef SI_TYPE_SIZE
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#define SI_TYPE_SIZE 32
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#endif
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#define __ll_b (1L << (SI_TYPE_SIZE / 2))
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#define __ll_lowpart(t) ((usitype) (t) % __ll_b)
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#define __ll_highpart(t) ((usitype) (t) / __ll_b)
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#define BITS_PER_UNIT 8
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#if !defined(umul_ppmm)
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#define umul_ppmm(w1, w0, u, v) \
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do { \
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usitype __x0, __x1, __x2, __x3; \
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usitype __ul, __vl, __uh, __vh; \
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\
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__ul = __ll_lowpart (u); \
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__uh = __ll_highpart (u); \
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__vl = __ll_lowpart (v); \
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__vh = __ll_highpart (v); \
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\
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__x0 = (usitype) __ul * __vl; \
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__x1 = (usitype) __ul * __vh; \
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__x2 = (usitype) __uh * __vl; \
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__x3 = (usitype) __uh * __vh; \
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\
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__x1 += __ll_highpart (__x0);/* this can't give carry */ \
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__x1 += __x2; /* but this indeed can */ \
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if (__x1 < __x2) /* did we get it? */ \
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__x3 += __ll_b; /* yes, add it in the proper pos. */ \
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\
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(w1) = __x3 + __ll_highpart (__x1); \
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(w0) = __ll_lowpart (__x1) * __ll_b + __ll_lowpart (__x0); \
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} while (0)
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#endif
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#if !defined(__umulsidi3)
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#define __umulsidi3(u, v) \
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({diunion __w; \
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umul_ppmm (__w.s.high, __w.s.low, u, v); \
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__w.ll; })
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#endif
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typedef unsigned int usitype __attribute__ ((mode(SI)));
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typedef int sitype __attribute__ ((mode(SI)));
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typedef int ditype __attribute__ ((mode(DI)));
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typedef int word_type __attribute__ ((mode(__word__)));
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struct distruct {
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sitype low, high;
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};
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typedef union {
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struct distruct s;
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ditype ll;
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} diunion;
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#ifdef CONFIG_ARITHMETIC_OPS_L1
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ditype __muldi3(ditype u, ditype v)__attribute__((l1_text));
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#endif
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ditype __muldi3(ditype u, ditype v)
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{
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diunion w;
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diunion uu, vv;
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uu.ll = u, vv.ll = v;
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w.ll = __umulsidi3(uu.s.low, vv.s.low);
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w.s.high += ((usitype) uu.s.low * (usitype) vv.s.high
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+ (usitype) uu.s.high * (usitype) vv.s.low);
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return w.ll;
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}
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