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

1.1     ! maekawa     1: # Pyramid __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  2
        !            25: .globl ___mpn_sub_n
        !            26: ___mpn_sub_n:
        !            27:        movw    $-1,tr0         # representation for carry clear
        !            28:
        !            29:        movw    pr3,tr2
        !            30:        andw    $3,tr2
        !            31:        beq     Lend0
        !            32:        subw    tr2,pr3
        !            33:
        !            34: Loop0: rsubw   $0,tr0          # restore carry bit from carry-save register
        !            35:
        !            36:        movw    (pr1),tr1
        !            37:        subwb   (pr2),tr1
        !            38:        movw    tr1,(pr0)
        !            39:
        !            40:        subwb   tr0,tr0
        !            41:        addw    $4,pr0
        !            42:        addw    $4,pr1
        !            43:        addw    $4,pr2
        !            44:        addw    $-1,tr2
        !            45:        bne     Loop0
        !            46:
        !            47:        mtstw   pr3,pr3
        !            48:        beq     Lend
        !            49: Lend0:
        !            50: Loop:  rsubw   $0,tr0          # restore carry bit from carry-save register
        !            51:
        !            52:        movw    (pr1),tr1
        !            53:        subwb   (pr2),tr1
        !            54:        movw    tr1,(pr0)
        !            55:
        !            56:        movw    4(pr1),tr1
        !            57:        subwb   4(pr2),tr1
        !            58:        movw    tr1,4(pr0)
        !            59:
        !            60:        movw    8(pr1),tr1
        !            61:        subwb   8(pr2),tr1
        !            62:        movw    tr1,8(pr0)
        !            63:
        !            64:        movw    12(pr1),tr1
        !            65:        subwb   12(pr2),tr1
        !            66:        movw    tr1,12(pr0)
        !            67:
        !            68:        subwb   tr0,tr0
        !            69:        addw    $16,pr0
        !            70:        addw    $16,pr1
        !            71:        addw    $16,pr2
        !            72:        addw    $-4,pr3
        !            73:        bne     Loop
        !            74: Lend:
        !            75:        mnegw   tr0,pr0
        !            76:        ret