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Annotation of OpenXM_contrib/gmp/mpn/z8000/sub_n.s, Revision 1.1

1.1     ! maekawa     1: ! Z8000 __mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
        !             2: ! store difference in a third limb vector.
        !             3:
        !             4: ! Copyright (C) 1993, 1994 Free Software Foundation, Inc.
        !             5:
        !             6: ! This file is part of the GNU MP Library.
        !             7:
        !             8: ! The GNU MP Library is free software; you can redistribute it and/or modify
        !             9: ! it under the terms of the GNU Library General Public License as published by
        !            10: ! the Free Software Foundation; either version 2 of the License, or (at your
        !            11: ! option) any later version.
        !            12:
        !            13: ! The GNU MP Library is distributed in the hope that it will be useful, but
        !            14: ! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            15: ! or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
        !            16: ! License for more details.
        !            17:
        !            18: ! You should have received a copy of the GNU Library General Public License
        !            19: ! along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            20: ! the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            21: ! MA 02111-1307, USA.
        !            22:
        !            23:
        !            24: ! INPUT PARAMETERS
        !            25: ! res_ptr      r7
        !            26: ! s1_ptr       r6
        !            27: ! s2_ptr       r5
        !            28: ! size         r4
        !            29:
        !            30: ! If we are really crazy, we can use push to write a few result words
        !            31: ! backwards, using push just because it is faster than reg+disp.  We'd
        !            32: ! then add 2x the number of words written to r7...
        !            33:
        !            34:        unseg
        !            35:        .text
        !            36:        even
        !            37:        global ___mpn_sub_n
        !            38: ___mpn_sub_n:
        !            39:        pop     r0,@r6
        !            40:        pop     r1,@r5
        !            41:        sub     r0,r1
        !            42:        ld      @r7,r0
        !            43:        dec     r4
        !            44:        jr      eq,Lend
        !            45: Loop:  pop     r0,@r6
        !            46:        pop     r1,@r5
        !            47:        sbc     r0,r1
        !            48:        inc     r7,#2
        !            49:        ld      @r7,r0
        !            50:        dec     r4
        !            51:        jr      ne,Loop
        !            52: Lend:  ld      r2,r4           ! use 0 already in r4
        !            53:        adc     r2,r2
        !            54:        ret     t