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Annotation of OpenXM/src/kan96xx/gmp-2.0.2-ssh-2/mpn/power/rshift.s, Revision 1.1

1.1     ! takayama    1: # IBM POWER __mpn_rshift --
        !             2:
        !             3: # Copyright (C) 1992, 1994 Free Software Foundation, Inc.
        !             4:
        !             5: # This file is part of the GNU MP Library.
        !             6:
        !             7: # The GNU MP Library is free software; you can redistribute it and/or modify
        !             8: # it under the terms of the GNU Library General Public License as published by
        !             9: # the Free Software Foundation; either version 2 of the License, or (at your
        !            10: # option) any later version.
        !            11:
        !            12: # The GNU MP Library is distributed in the hope that it will be useful, but
        !            13: # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            14: # or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
        !            15: # License for more details.
        !            16:
        !            17: # You should have received a copy of the GNU Library General Public License
        !            18: # along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            19: # the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            20: # MA 02111-1307, USA.
        !            21:
        !            22:
        !            23: # INPUT PARAMETERS
        !            24: # res_ptr      r3
        !            25: # s_ptr                r4
        !            26: # size         r5
        !            27: # cnt          r6
        !            28:
        !            29:        .toc
        !            30:        .extern __mpn_rshift[DS]
        !            31:        .extern .__mpn_rshift
        !            32: .csect [PR]
        !            33:        .align 2
        !            34:        .globl __mpn_rshift
        !            35:        .globl .__mpn_rshift
        !            36:        .csect __mpn_rshift[DS]
        !            37: __mpn_rshift:
        !            38:        .long .__mpn_rshift, TOC[tc0], 0
        !            39:        .csect [PR]
        !            40: .__mpn_rshift:
        !            41:        sfi     8,6,32
        !            42:        mtctr   5               # put limb count in CTR loop register
        !            43:        l       0,0(4)          # read least significant limb
        !            44:        ai      9,3,-4          # adjust res_ptr since it's offset in the stu:s
        !            45:        sle     3,0,8           # compute carry limb, and init MQ register
        !            46:        bdz     Lend2           # if just one limb, skip loop
        !            47:        lu      0,4(4)          # read 2:nd least significant limb
        !            48:        sleq    7,0,8           # compute least significant limb of result
        !            49:        bdz     Lend            # if just two limb, skip loop
        !            50: Loop:  lu      0,4(4)          # load next higher limb
        !            51:        stu     7,4(9)          # store previous result during read latency
        !            52:        sleq    7,0,8           # compute result limb
        !            53:        bdn     Loop            # loop back until CTR is zero
        !            54: Lend:  stu     7,4(9)          # store 2:nd most significant limb
        !            55: Lend2: sre     7,0,6           # compute most significant limb
        !            56:        st      7,4(9)          # store it"                             \
        !            57:        br