57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
/* More subroutines needed by GCC output code on some machines. */
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/* Compile this one with gcc. */
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/* Copyright (C) 1989, 92-98, 1999 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* As a special exception, if you link this library with other files,
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some of which are compiled with GCC, to produce an executable,
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this library does not by itself cause the resulting executable
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to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License.
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*/
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/* support functions required by the kernel. based on code from gcc-2.95.3 */
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/* I Molton 29/07/01 */
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#include "gcclib.h"
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s64 __ashrdi3(s64 u, int b)
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{
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DIunion w;
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int bm;
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DIunion uu;
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if (b == 0)
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return u;
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uu.ll = u;
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bm = (sizeof(s32) * BITS_PER_UNIT) - b;
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if (bm <= 0) {
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/* w.s.high = 1..1 or 0..0 */
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w.s.high = uu.s.high >> (sizeof(s32) * BITS_PER_UNIT - 1);
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w.s.low = uu.s.high >> -bm;
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} else {
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u32 carries = (u32) uu.s.high << bm;
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w.s.high = uu.s.high >> b;
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w.s.low = ((u32) uu.s.low >> b) | carries;
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}
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return w.ll;
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}
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