/* 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. */
|
|
#include <linux/compiler.h>
|
#include <linux/export.h>
|
|
#ifdef CONFIG_CPU_HAS_NO_MULDIV64
|
|
#define SI_TYPE_SIZE 32
|
#define __BITS4 (SI_TYPE_SIZE / 4)
|
#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 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)
|
|
#else
|
|
#define umul_ppmm(w1, w0, u, v) \
|
__asm__ ("mulu%.l %3,%1:%0" \
|
: "=d" ((USItype)(w0)), \
|
"=d" ((USItype)(w1)) \
|
: "%0" ((USItype)(u)), \
|
"dmi" ((USItype)(v)))
|
|
#endif
|
|
#define __umulsidi3(u, v) \
|
({DIunion __w; \
|
umul_ppmm (__w.s.high, __w.s.low, u, v); \
|
__w.ll; })
|
|
typedef int SItype __mode(SI);
|
typedef unsigned int USItype __mode(SI);
|
typedef int DItype __mode(DI);
|
typedef int word_type __mode(__word__);
|
|
struct DIstruct {SItype high, low;};
|
|
typedef union
|
{
|
struct DIstruct s;
|
DItype ll;
|
} DIunion;
|
|
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;
|
}
|
EXPORT_SYMBOL(__muldi3);
|
