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Annotation of OpenXM_contrib/gmp/mpn/a29k/rshift.s, Revision 1.1

1.1     ! maekawa     1: ; 29000 __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      lr2
        !            25: ; s1_ptr       lr3
        !            26: ; s2_ptr       lr4
        !            27: ; size         lr5
        !            28:
        !            29: ; We use the loadm/storem instructions and operate on chunks of 8
        !            30: ; limbs/per iteration, until less than 8 limbs remain.
        !            31:
        !            32:        .sect .lit,lit
        !            33:        .text
        !            34:        .align  4
        !            35:        .global ___mpn_rshift
        !            36:        .word   0x60000
        !            37: ___mpn_rshift:
        !            38:        load    0,0,gr119,lr3
        !            39:        add     lr3,lr3,4
        !            40:
        !            41:        subr    gr116,lr5,32
        !            42:        sll     gr96,gr119,gr116        ; return value
        !            43:        sub     lr4,lr4,1               ; actual loop count is SIZE - 1
        !            44:
        !            45:        srl     gr117,lr4,3             ; chuck count = (actual count) / 8
        !            46:        cpeq    gr118,gr117,0
        !            47:        jmpt    gr118,Ltail
        !            48:         mtsr   fc,gr116
        !            49:
        !            50:        sub     gr117,gr117,2           ; count for jmpfdec
        !            51:
        !            52: ; Main loop working 8 limbs/iteration.
        !            53: Loop:  mtsrim  cr,(8-1)
        !            54:        loadm   0,0,gr100,lr3
        !            55:        add     lr3,lr3,32
        !            56:
        !            57:        extract gr98,gr100,gr119
        !            58:        extract gr99,gr101,gr100
        !            59:        extract gr100,gr102,gr101
        !            60:        extract gr101,gr103,gr102
        !            61:        extract gr102,gr104,gr103
        !            62:        extract gr103,gr105,gr104
        !            63:        extract gr104,gr106,gr105
        !            64:        extract gr105,gr107,gr106
        !            65:
        !            66:        mtsrim  cr,(8-1)
        !            67:        storem  0,0,gr98,lr2
        !            68:        add     lr2,lr2,32
        !            69:        jmpfdec gr117,Loop
        !            70:         or     gr119,gr107,0
        !            71:
        !            72: ; Code for the last up-to-7 limbs.
        !            73:
        !            74:        and     lr4,lr4,(8-1)
        !            75: Ltail: cpeq    gr118,lr4,0
        !            76:        jmpt    gr118,Lend
        !            77:         sub    lr4,lr4,2               ; count for jmpfdec
        !            78:
        !            79: Loop2: load    0,0,gr100,lr3
        !            80:        add     lr3,lr3,4
        !            81:        extract gr117,gr100,gr119
        !            82:        store   0,0,gr117,lr2
        !            83:        add     lr2,lr2,4
        !            84:        jmpfdec lr4,Loop2
        !            85:         or     gr119,gr100,0
        !            86:
        !            87: Lend:  srl     gr117,gr119,lr5
        !            88:        jmpi    lr0
        !            89:         store  0,0,gr117,lr2