mirror of https://gitee.com/openkylin/linux.git
73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
/*
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* File: arch/blackfin/lib/lshrdi3.c
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* Based on:
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* Author:
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*
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* Created:
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* Description:
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*
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* Modified:
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* Copyright 2004-2006 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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*
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* This program 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 of the License, or
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* (at your option) any later version.
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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#define BITS_PER_UNIT 8
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typedef int SItype __attribute__ ((mode(SI)));
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typedef unsigned int USItype __attribute__ ((mode(SI)));
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typedef int DItype __attribute__ ((mode(DI)));
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typedef int word_type __attribute__ ((mode(__word__)));
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struct DIstruct {
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SItype high, low;
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};
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typedef union {
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struct DIstruct s;
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DItype ll;
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} DIunion;
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#ifdef CONFIG_ARITHMETIC_OPS_L1
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DItype __lshrdi3(DItype u, word_type b)__attribute__((l1_text));
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#endif
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DItype __lshrdi3(DItype u, word_type b)
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{
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DIunion w;
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word_type 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(SItype) * BITS_PER_UNIT) - b;
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if (bm <= 0) {
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w.s.high = 0;
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w.s.low = (USItype) uu.s.high >> -bm;
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} else {
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USItype carries = (USItype) uu.s.high << bm;
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w.s.high = (USItype) uu.s.high >> b;
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w.s.low = ((USItype) uu.s.low >> b) | carries;
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}
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return w.ll;
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}
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