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/arch/arm/lib/muldi3.c

https://bitbucket.org/evzijst/gittest
C | 77 lines | 37 code | 11 blank | 29 comment | 0 complexity | 22cf702d9010fc84ff859ab7ba92df55 MD5 | raw file
 1/* More subroutines needed by GCC output code on some machines.  */
 2/* Compile this one with gcc.  */
 3/* Copyright (C) 1989, 92-98, 1999 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
17You should have received a copy of the GNU General Public License
18along with GNU CC; see the file COPYING.  If not, write to
19the Free Software Foundation, 59 Temple Place - Suite 330,
20Boston, MA 02111-1307, USA.  */
21
22/* As a special exception, if you link this library with other files,
23   some of which are compiled with GCC, to produce an executable,
24   this library does not by itself cause the resulting executable
25   to be covered by the GNU General Public License.
26   This exception does not however invalidate any other reasons why
27   the executable file might be covered by the GNU General Public License.
28 */
29/* support functions required by the kernel. based on code from gcc-2.95.3 */
30/* I Molton     29/07/01 */
31
32#include "gcclib.h"
33
34#define umul_ppmm(xh, xl, a, b) \
35{register USItype __t0, __t1, __t2;                                     \
36  __asm__ ("%@ Inlined umul_ppmm					\n\
37        mov     %2, %5, lsr #16						\n\
38        mov     %0, %6, lsr #16						\n\
39        bic     %3, %5, %2, lsl #16					\n\
40        bic     %4, %6, %0, lsl #16					\n\
41        mul     %1, %3, %4						\n\
42        mul     %4, %2, %4						\n\
43        mul     %3, %0, %3						\n\
44        mul     %0, %2, %0						\n\
45        adds    %3, %4, %3						\n\
46        addcs   %0, %0, #65536						\n\
47        adds    %1, %1, %3, lsl #16					\n\
48        adc     %0, %0, %3, lsr #16"                                    \
49           : "=&r" ((USItype) (xh)),                                    \
50             "=r" ((USItype) (xl)),                                     \
51             "=&r" (__t0), "=&r" (__t1), "=r" (__t2)                    \
52           : "r" ((USItype) (a)),                                       \
53             "r" ((USItype) (b)));}
54
55
56#define __umulsidi3(u, v) \
57  ({DIunion __w;                                                        \
58    umul_ppmm (__w.s.high, __w.s.low, u, v);                            \
59    __w.ll; })
60
61
62DItype
63__muldi3 (DItype u, DItype v)
64{
65  DIunion w;
66  DIunion uu, vv;
67
68  uu.ll = u,
69  vv.ll = v;
70
71  w.ll = __umulsidi3 (uu.s.low, vv.s.low);
72  w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
73               + (USItype) uu.s.high * (USItype) vv.s.low);
74
75  return w.ll;
76}
77