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