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
5This file is part of GNU CC.
6
7GNU CC is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2, or (at your option)
10any later version.
11
12GNU CC is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15GNU 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
69typedef 	 int SItype	__mode(SI);
70typedef unsigned int USItype	__mode(SI);
71typedef		 int DItype	__mode(DI);
72typedef int word_type           __mode(__word__);
73
74struct DIstruct {SItype high, low;};
75
76typedef union
77{
78  struct DIstruct s;
79  DItype ll;
80} DIunion;
81
82DItype
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}
97EXPORT_SYMBOL(__muldi3);
98