Release 4.14 arch/m68k/lib/muldi3.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. */

#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;
}
Contributors
Person
Tokens
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Commits
CommitProp
Greg Ungerer
99
100.00%
1
100.00%
Total
99
100.00%
1
100.00%


EXPORT_SYMBOL(__muldi3);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Greg Ungerer
216
87.45%
3
42.86%
Gideon Israel Dsouza
16
6.48%
1
14.29%
Al Viro
11
4.45%
1
14.29%
Geert Uytterhoeven
4
1.62%
2
28.57%
Total
247
100.00%
7
100.00%
Directory: arch/m68k/lib

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