1995-10-16 01:18:40 +00:00
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! Z8000 __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) 1993, 1994 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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1996-05-07 21:04:45 +00:00
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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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1995-10-16 01:18:40 +00:00
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! INPUT PARAMETERS
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! res_ptr r7
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! s1_ptr r6
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! s2_ptr r5
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! size r4
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! If we are really crazy, we can use push to write a few result words
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! backwards, using push just because it is faster than reg+disp. We'd
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! then add 2x the number of words written to r7...
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unseg
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.text
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even
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global ___mpn_sub_n
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___mpn_sub_n:
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pop r0,@r6
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pop r1,@r5
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sub r0,r1
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ld @r7,r0
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dec r4
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jr eq,Lend
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Loop: pop r0,@r6
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pop r1,@r5
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sbc r0,r1
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inc r7,#2
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ld @r7,r0
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dec r4
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jr ne,Loop
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Lend: ld r2,r4 ! use 0 already in r4
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adc r2,r2
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ret t
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