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Annotation of OpenXM_contrib/gmp/mpn/power/rshift.asm, Revision 1.1

1.1     ! ohara       1: dnl  IBM POWER mpn_rshift -- Shift a number right.
        !             2:
        !             3: dnl  Copyright 1992, 1994, 1999, 2000, 2001 Free Software Foundation, Inc.
        !             4:
        !             5: dnl  This file is part of the GNU MP Library.
        !             6:
        !             7: dnl  The GNU MP Library is free software; you can redistribute it and/or modify
        !             8: dnl  it under the terms of the GNU Lesser General Public License as published
        !             9: dnl  by the Free Software Foundation; either version 2.1 of the License, or (at
        !            10: dnl  your option) any later version.
        !            11:
        !            12: dnl  The GNU MP Library is distributed in the hope that it will be useful, but
        !            13: dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            14: dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            15: dnl  License for more details.
        !            16:
        !            17: dnl  You should have received a copy of the GNU Lesser General Public License
        !            18: dnl  along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            19: dnl  the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            20: dnl  MA 02111-1307, USA.
        !            21:
        !            22:
        !            23: dnl  INPUT PARAMETERS
        !            24: dnl  res_ptr   r3
        !            25: dnl  s_ptr     r4
        !            26: dnl  size      r5
        !            27: dnl  cnt       r6
        !            28:
        !            29: include(`../config.m4')
        !            30:
        !            31: ASM_START()
        !            32: PROLOGUE(mpn_rshift)
        !            33:        sfi     8,6,32
        !            34:        mtctr   5               C put limb count in CTR loop register
        !            35:        l       0,0(4)          C read least significant limb
        !            36:        ai      9,3,-4          C adjust res_ptr since it's offset in the stu:s
        !            37:        sle     3,0,8           C compute carry limb, and init MQ register
        !            38:        bdz     Lend2           C if just one limb, skip loop
        !            39:        lu      0,4(4)          C read 2:nd least significant limb
        !            40:        sleq    7,0,8           C compute least significant limb of result
        !            41:        bdz     Lend            C if just two limb, skip loop
        !            42: Loop:  lu      0,4(4)          C load next higher limb
        !            43:        stu     7,4(9)          C store previous result during read latency
        !            44:        sleq    7,0,8           C compute result limb
        !            45:        bdn     Loop            C loop back until CTR is zero
        !            46: Lend:  stu     7,4(9)          C store 2:nd most significant limb
        !            47: Lend2: sre     7,0,6           C compute most significant limb
        !            48:        st      7,4(9)          C store it
        !            49:        br
        !            50: EPILOGUE(mpn_rshift)