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Annotation of OpenXM_contrib/gmp/mpn/sparc64/sub_n.s, Revision 1.1.1.1

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