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Annotation of OpenXM_contrib/gmp/mpn/a29k/lshift.s, Revision 1.1.1.3

1.1.1.2   maekawa     1: ; 29000 __gmpn_lshift --
1.1       maekawa     2:
1.1.1.3 ! ohara       3: ; Copyright 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_lshift
1.1       maekawa    36:        .word   0x60000
1.1.1.2   maekawa    37: ___gmpn_lshift:
1.1       maekawa    38:        sll     gr116,lr4,2
                     39:        add     lr3,gr116,lr3
                     40:        add     lr2,gr116,lr2
                     41:        sub     lr3,lr3,4
                     42:        load    0,0,gr119,lr3
                     43:
                     44:        subr    gr116,lr5,32
                     45:        srl     gr96,gr119,gr116        ; return value
                     46:        sub     lr4,lr4,1               ; actual loop count is SIZE - 1
                     47:
                     48:        srl     gr117,lr4,3             ; chuck count = (actual count) / 8
                     49:        cpeq    gr118,gr117,0
                     50:        jmpt    gr118,Ltail
                     51:         mtsr   fc,lr5
                     52:
                     53:        sub     gr117,gr117,2           ; count for jmpfdec
                     54:
                     55: ; Main loop working 8 limbs/iteration.
                     56: Loop:  sub     lr3,lr3,32
                     57:        mtsrim  cr,(8-1)
                     58:        loadm   0,0,gr100,lr3
                     59:
                     60:        extract gr109,gr119,gr107
                     61:        extract gr108,gr107,gr106
                     62:        extract gr107,gr106,gr105
                     63:        extract gr106,gr105,gr104
                     64:        extract gr105,gr104,gr103
                     65:        extract gr104,gr103,gr102
                     66:        extract gr103,gr102,gr101
                     67:        extract gr102,gr101,gr100
                     68:
                     69:        sub     lr2,lr2,32
                     70:        mtsrim  cr,(8-1)
                     71:        storem  0,0,gr102,lr2
                     72:        jmpfdec gr117,Loop
                     73:         or     gr119,gr100,0
                     74:
                     75: ; Code for the last up-to-7 limbs.
                     76:
                     77:        and     lr4,lr4,(8-1)
                     78: Ltail: cpeq    gr118,lr4,0
                     79:        jmpt    gr118,Lend
                     80:         sub    lr4,lr4,2               ; count for jmpfdec
                     81:
                     82: Loop2: sub     lr3,lr3,4
                     83:        load    0,0,gr116,lr3
                     84:        extract gr117,gr119,gr116
                     85:        sub     lr2,lr2,4
                     86:        store   0,0,gr117,lr2
                     87:        jmpfdec lr4,Loop2
                     88:         or     gr119,gr116,0
                     89:
                     90: Lend:  extract gr117,gr119,0
                     91:        sub     lr2,lr2,4
                     92:        jmpi    lr0
                     93:         store  0,0,gr117,lr2