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Annotation of qemu/roms/openbios/libgcc/__lshrdi3.c, revision 1.1

1.1     ! root        1: /* lshrdi3.c extracted from gcc-2.7.2/libgcc2.c which is: */
        !             2: /* Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
        !             3: 
        !             4: This file is part of GNU CC.
        !             5: 
        !             6: GNU CC is free software; you can redistribute it and/or modify
        !             7: it under the terms of the GNU General Public License as published by
        !             8: the Free Software Foundation; either version 2, or (at your option)
        !             9: any later version.
        !            10: 
        !            11: GNU CC is distributed in the hope that it will be useful,
        !            12: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            14: GNU General Public License for more details.
        !            15: 
        !            16: You should have received a copy of the GNU General Public License
        !            17: along with GNU CC; see the file COPYING.  If not, write to
        !            18: the Free Software Foundation, 51 Franklin St, Fifth Floor, Boston,
        !            19: MA 02110-1301, USA. */
        !            20: 
        !            21: #include "libgcc.h"
        !            22: 
        !            23: #define BITS_PER_UNIT 8
        !            24: 
        !            25: struct DIstruct {SItype high, low;};
        !            26: 
        !            27: typedef union
        !            28: {
        !            29:   struct DIstruct s;
        !            30:   DItype ll;
        !            31: } DIunion;
        !            32: 
        !            33: DItype
        !            34: __lshrdi3 (DItype u, word_type b)
        !            35: {
        !            36:   DIunion w;
        !            37:   word_type bm;
        !            38:   DIunion uu;
        !            39: 
        !            40:   if (b == 0)
        !            41:     return u;
        !            42: 
        !            43:   uu.ll = u;
        !            44: 
        !            45:   bm = (sizeof (SItype) * BITS_PER_UNIT) - b;
        !            46:   if (bm <= 0)
        !            47:     {
        !            48:       w.s.high = 0;
        !            49:       w.s.low = (USItype)uu.s.high >> -bm;
        !            50:     }
        !            51:   else
        !            52:     {
        !            53:       USItype carries = (USItype)uu.s.high << bm;
        !            54:       w.s.high = (USItype)uu.s.high >> b;
        !            55:       w.s.low = ((USItype)uu.s.low >> b) | carries;
        !            56:     }
        !            57: 
        !            58:   return w.ll;
        !            59: }

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