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61 lines
1.4 KiB
61 lines
1.4 KiB
/* lshrdi3.c extracted from gcc-2.7.2/libgcc2.c which is: */ |
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/* Copyright (C) 1989, 1992, 1993, 1994, 1995 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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#include <linux/compiler.h> |
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#include <linux/export.h> |
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#define BITS_PER_UNIT 8 |
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typedef int SItype __mode(SI); |
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typedef unsigned int USItype __mode(SI); |
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typedef int DItype __mode(DI); |
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typedef int word_type __mode(__word__); |
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struct DIstruct {SItype high, low;}; |
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typedef union |
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{ |
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struct DIstruct s; |
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DItype ll; |
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} DIunion; |
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DItype |
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__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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{ |
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w.s.high = 0; |
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w.s.low = (USItype)uu.s.high >> -bm; |
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} |
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else |
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{ |
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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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EXPORT_SYMBOL(__lshrdi3);
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