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Annotation of OpenXM_contrib/gmp/mpn/sparc64/sub_n.s, Revision 1.1

1.1     ! maekawa     1: ! SPARC v9 __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, 1996 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      %o0
        !            26: ! s1_ptr       %o1
        !            27: ! s2_ptr       %o2
        !            28: ! size         %o3
        !            29:
        !            30: .section       ".text"
        !            31:        .align 4
        !            32:        .global __mpn_sub_n
        !            33:        .type    __mpn_sub_n,#function
        !            34:        .proc   04
        !            35: __mpn_sub_n:
        !            36:        sub %g0,%o3,%g3
        !            37:        sllx %o3,3,%g1
        !            38:        add %o1,%g1,%o1                 ! make s1_ptr point at end
        !            39:        add %o2,%g1,%o2                 ! make s2_ptr point at end
        !            40:        add %o0,%g1,%o0                 ! make res_ptr point at end
        !            41:        mov 0,%o4                       ! clear carry variable
        !            42:        sllx %g3,3,%o5                  ! compute initial address index
        !            43:
        !            44: .Loop: ldx [%o2+%o5],%g1               ! load s2 limb
        !            45:        add %g3,1,%g3                   ! increment loop count
        !            46:        ldx [%o1+%o5],%g2               ! load s1 limb
        !            47:        addcc %g1,%o4,%g1               ! add s2 limb and carry variable
        !            48:        movcc %xcc,0,%o4                ! if carry-out, o4 was 1; clear it
        !            49:        subcc %g1,%g2,%g1               ! subtract s1 limb from sum
        !            50:        stx %g1,[%o0+%o5]               ! store result
        !            51:        add %o5,8,%o5                   ! increment address index
        !            52:        brnz,pt %g3,.Loop
        !            53:        movcs %xcc,1,%o4                ! if s1 subtract gave carry, record it
        !            54:
        !            55:        retl
        !            56:        mov %o4,%o0
        !            57: .LLfe1:
        !            58:        .size    __mpn_sub_n,.LLfe1-__mpn_sub_n