mirror of
https://github.com/AsahiLinux/u-boot
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92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
/*
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* U-boot - muldi3.c contains routines for mult and div
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*
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* Copyright (c) 2005 blackfin.uclinux.org
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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/* Generic function got from GNU gcc package, libgcc2.c */
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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 {SItype low, high;};
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typedef union
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{
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struct DIstruct s;
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DItype ll;
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} DIunion;
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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,
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vv.ll = v;
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/* panic("kernel panic for __muldi3"); */
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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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