62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
/* ashrdi3.c extracted from gcc-2.7.2/libgcc2.c 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 Licence 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 Licence for more details.
|
|
|
|
You should have received a copy of the GNU General Public Licence
|
|
along with GNU CC; see the file COPYING. If not, write to
|
|
the Free Software Foundation, 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#define BITS_PER_UNIT 8
|
|
|
|
typedef int SItype __attribute__((mode(SI)));
|
|
typedef unsigned int USItype __attribute__((mode(SI)));
|
|
typedef int DItype __attribute__((mode(DI)));
|
|
typedef int word_type __attribute__((mode(__word__)));
|
|
|
|
struct DIstruct {
|
|
SItype low;
|
|
SItype high;
|
|
};
|
|
|
|
union DIunion {
|
|
struct DIstruct s;
|
|
DItype ll;
|
|
};
|
|
|
|
DItype __ashrdi3(DItype u, word_type b)
|
|
{
|
|
union DIunion w;
|
|
union DIunion uu;
|
|
word_type bm;
|
|
|
|
if (b == 0)
|
|
return u;
|
|
|
|
uu.ll = u;
|
|
|
|
bm = (sizeof(SItype) * BITS_PER_UNIT) - b;
|
|
if (bm <= 0) {
|
|
/* w.s.high = 1..1 or 0..0 */
|
|
w.s.high = uu.s.high >> (sizeof(SItype) * BITS_PER_UNIT - 1);
|
|
w.s.low = uu.s.high >> -bm;
|
|
} else {
|
|
USItype carries = (USItype)uu.s.high << bm;
|
|
w.s.high = uu.s.high >> b;
|
|
w.s.low = ((USItype)uu.s.low >> b) | carries;
|
|
}
|
|
|
|
return w.ll;
|
|
}
|