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59 lines
1.9 KiB
ArmAsm
59 lines
1.9 KiB
ArmAsm
! SPARC v9 __mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
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! store difference in a third limb vector.
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! Copyright (C) 1995, 1996 Free Software Foundation, Inc.
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! This file is part of the GNU MP Library.
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! The GNU MP Library is free software; you can redistribute it and/or modify
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! it under the terms of the GNU Library General Public License as published by
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! the Free Software Foundation; either version 2 of the License, or (at your
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! option) any later version.
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! The GNU MP Library is distributed in the hope that it will be useful, but
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! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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! or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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! License for more details.
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! You should have received a copy of the GNU Library General Public License
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! along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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! the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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! MA 02111-1307, USA.
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! INPUT PARAMETERS
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! res_ptr %o0
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! s1_ptr %o1
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! s2_ptr %o2
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! size %o3
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.section ".text"
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.align 4
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.global __mpn_sub_n
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.type __mpn_sub_n,#function
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.proc 04
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__mpn_sub_n:
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sub %g0,%o3,%g3
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sllx %o3,3,%g1
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add %o1,%g1,%o1 ! make s1_ptr point at end
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add %o2,%g1,%o2 ! make s2_ptr point at end
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add %o0,%g1,%o0 ! make res_ptr point at end
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mov 0,%o4 ! clear carry variable
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sllx %g3,3,%o5 ! compute initial address index
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.Loop: ldx [%o2+%o5],%g1 ! load s2 limb
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add %g3,1,%g3 ! increment loop count
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ldx [%o1+%o5],%g2 ! load s1 limb
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addcc %g1,%o4,%g1 ! add s2 limb and carry variable
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movcc %xcc,0,%o4 ! if carry-out, o4 was 1; clear it
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subcc %g1,%g2,%g1 ! subtract s1 limb from sum
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stx %g1,[%o0+%o5] ! store result
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add %o5,8,%o5 ! increment address index
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brnz,pt %g3,.Loop
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movcs %xcc,1,%o4 ! if s1 subtract gave carry, record it
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retl
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mov %o4,%o0
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.LLfe1:
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.size __mpn_sub_n,.LLfe1-__mpn_sub_n
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