1  /* muldi3.c extracted from gcc-2.7.2.3/libgcc2.c and
2  			   gcc-2.7.2.3/longlong.h which is: */
3  /* Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
4  
5  This file is part of GNU CC.
6  
7  GNU CC is free software; you can redistribute it and/or modify
8  it under the terms of the GNU General Public License as published by
9  the Free Software Foundation; either version 2, or (at your option)
10  any later version.
11  
12  GNU CC is distributed in the hope that it will be useful,
13  but WITHOUT ANY WARRANTY; without even the implied warranty of
14  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  GNU General Public License for more details. */
16  
17  #include <linux/compiler.h>
18  #include <linux/export.h>
19  #include <linux/libgcc.h>
20  
21  #ifdef CONFIG_CPU_HAS_NO_MULDIV64
22  
23  #define SI_TYPE_SIZE 32
24  #define __BITS4 (SI_TYPE_SIZE / 4)
25  #define __ll_B (1L << (SI_TYPE_SIZE / 2))
26  #define __ll_lowpart(t) ((USItype) (t) % __ll_B)
27  #define __ll_highpart(t) ((USItype) (t) / __ll_B)
28  
29  #define umul_ppmm(w1, w0, u, v)						\
30    do {									\
31      USItype __x0, __x1, __x2, __x3;					\
32      USItype __ul, __vl, __uh, __vh;					\
33  									\
34      __ul = __ll_lowpart (u);						\
35      __uh = __ll_highpart (u);						\
36      __vl = __ll_lowpart (v);						\
37      __vh = __ll_highpart (v);						\
38  									\
39      __x0 = (USItype) __ul * __vl;					\
40      __x1 = (USItype) __ul * __vh;					\
41      __x2 = (USItype) __uh * __vl;					\
42      __x3 = (USItype) __uh * __vh;					\
43  									\
44      __x1 += __ll_highpart (__x0);/* this can't give carry */		\
45      __x1 += __x2;		/* but this indeed can */		\
46      if (__x1 < __x2)		/* did we get it? */			\
47        __x3 += __ll_B;		/* yes, add it in the proper pos. */	\
48  									\
49      (w1) = __x3 + __ll_highpart (__x1);					\
50      (w0) = __ll_lowpart (__x1) * __ll_B + __ll_lowpart (__x0);		\
51    } while (0)
52  
53  #else
54  
55  #define umul_ppmm(w1, w0, u, v) \
56    __asm__ ("mulu%.l %3,%1:%0"						\
57             : "=d" ((USItype)(w0)),					\
58               "=d" ((USItype)(w1))					\
59             : "%0" ((USItype)(u)),					\
60               "dmi" ((USItype)(v)))
61  
62  #endif
63  
64  #define __umulsidi3(u, v) \
65    ({DIunion __w;							\
66      umul_ppmm (__w.s.high, __w.s.low, u, v);				\
67      __w.ll; })
68  
69  typedef 	 int SItype	__mode(SI);
70  typedef unsigned int USItype	__mode(SI);
71  typedef		 int DItype	__mode(DI);
72  typedef int word_type           __mode(__word__);
73  
74  struct DIstruct {SItype high, low;};
75  
76  typedef union
77  {
78    struct DIstruct s;
79    DItype ll;
80  } DIunion;
81  
82  DItype
__muldi3(DItype u,DItype v)83  __muldi3 (DItype u, DItype v)
84  {
85    DIunion w;
86    DIunion uu, vv;
87  
88    uu.ll = u;
89    vv.ll = v;
90  
91    w.ll = __umulsidi3 (uu.s.low, vv.s.low);
92    w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
93  	       + (USItype) uu.s.high * (USItype) vv.s.low);
94  
95    return w.ll;
96  }
97  EXPORT_SYMBOL(__muldi3);
98