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Annotation of OpenXM/src/kan96xx/gmp-2.0.2-ssh-2/mpn/i960/sub_n.s, Revision 1.1

1.1     ! takayama    1: # I960 __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) 1995 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: .text
        !            24:        .align 4
        !            25:        .globl ___mpn_sub_n
        !            26: ___mpn_sub_n:
        !            27:        mov     1,g6            # set carry-save register
        !            28:        cmpo    1,0             # clear cy
        !            29:
        !            30: Loop:  subo    1,g3,g3         # update loop counter
        !            31:        ld      (g1),g5         # load from s1_ptr
        !            32:        addo    4,g1,g1         # s1_ptr++
        !            33:        ld      (g2),g4         # load from s2_ptr
        !            34:        addo    4,g2,g2         # s2_ptr++
        !            35:        cmpo    g6,1            # restore cy from g6, relies on cy being 0
        !            36:        subc    g4,g5,g4        # main subtract
        !            37:        subc    0,0,g6          # save cy in g6
        !            38:        st      g4,(g0)         # store result to res_ptr
        !            39:        addo    4,g0,g0         # res_ptr++
        !            40:        cmpobne 0,g3,Loop       # when branch is taken, cy will be 0
        !            41:
        !            42:        mov     g6,g0
        !            43:        ret