83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/* muldi3.c extracted from gcc-2.7.2.3/libgcc2.c and
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gcc-2.7.2.3/longlong.h which is: */
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/* Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC 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, or (at your option)
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any later version.
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GNU CC 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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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 51 Franklin St, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "libgcc.h"
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#define BITS_PER_UNIT 8
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#define DI_TYPE_SIZE 64
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#define __BITS4 (DI_TYPE_SIZE / 4)
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#define __ll_B (1L << (DI_TYPE_SIZE / 2))
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#define __ll_lowpart(t) ((UDItype) (t) % __ll_B)
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#define __ll_highpart(t) ((UDItype) (t) / __ll_B)
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#define umul_ppmm(w1, w0, u, v) \
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do { \
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UDItype __x0, __x1, __x2, __x3; \
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UDItype __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 = (UDItype) __ul * __vl; \
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__x1 = (UDItype) __ul * __vh; \
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__x2 = (UDItype) __uh * __vl; \
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__x3 = (UDItype) __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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#define __umulsidi3(u, v) \
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({TIunion __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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struct TIstruct {DItype high, low;};
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typedef union
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{
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struct TIstruct s;
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TItype ll;
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} TIunion;
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TItype
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__multi3 (TItype u, TItype v)
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{
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TIunion w;
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TIunion uu, vv;
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uu.ll = u,
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vv.ll = v;
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w.ll = __umulsidi3 (uu.s.low, vv.s.low);
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w.s.high += ((UDItype) uu.s.low * (UDItype) vv.s.high
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+ (UDItype) uu.s.high * (UDItype) vv.s.low);
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return w.ll;
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}
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