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Annotation of OpenXM_contrib/gmp/mpn/a29k/rshift.s, Revision 1.1.1.2

1.1.1.2 ! maekawa     1: ; 29000 __gmpn_rshift --
1.1       maekawa     2:
1.1.1.2 ! maekawa     3: ; Copyright (C) 1992, 1994, 2000 Free Software Foundation, Inc.
1.1       maekawa     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
1.1.1.2 ! maekawa     8: ; it under the terms of the GNU Lesser General Public License as published by
        !             9: ; the Free Software Foundation; either version 2.1 of the License, or (at your
1.1       maekawa    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
1.1.1.2 ! maekawa    14: ; or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
1.1       maekawa    15: ; License for more details.
                     16:
1.1.1.2 ! maekawa    17: ; You should have received a copy of the GNU Lesser General Public License
1.1       maekawa    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
1.1.1.2 ! maekawa    35:        .global ___gmpn_rshift
1.1       maekawa    36:        .word   0x60000
1.1.1.2 ! maekawa    37: ___gmpn_rshift:
1.1       maekawa    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