diff options
Diffstat (limited to 'sysdeps/z8000/sub_n.s')
| -rw-r--r-- | sysdeps/z8000/sub_n.s | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/sysdeps/z8000/sub_n.s b/sysdeps/z8000/sub_n.s new file mode 100644 index 0000000000..f75ef22d04 --- /dev/null +++ b/sysdeps/z8000/sub_n.s @@ -0,0 +1,53 @@ +! Z8000 __mpn_sub_n -- Subtract two limb vectors of the same length > 0 and +! store difference in a third limb vector. + +! Copyright (C) 1993, 1994 Free Software Foundation, Inc. + +! This file is part of the GNU MP Library. + +! The GNU MP Library is free software; you can redistribute it and/or modify +! it under the terms of the GNU Library General Public License as published by +! the Free Software Foundation; either version 2 of the License, or (at your +! option) any later version. + +! The GNU MP Library is distributed in the hope that it will be useful, but +! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY +! or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public +! License for more details. + +! You should have received a copy of the GNU Library General Public License +! along with the GNU MP Library; see the file COPYING.LIB. If not, write to +! the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + + +! INPUT PARAMETERS +! res_ptr r7 +! s1_ptr r6 +! s2_ptr r5 +! size r4 + +! If we are really crazy, we can use push to write a few result words +! backwards, using push just because it is faster than reg+disp. We'd +! then add 2x the number of words written to r7... + + unseg + .text + even + global ___mpn_sub_n +___mpn_sub_n: + pop r0,@r6 + pop r1,@r5 + sub r0,r1 + ld @r7,r0 + dec r4 + jr eq,Lend +Loop: pop r0,@r6 + pop r1,@r5 + sbc r0,r1 + inc r7,#2 + ld @r7,r0 + dec r4 + jr ne,Loop +Lend: ld r2,r4 ! use 0 already in r4 + adc r2,r2 + ret t |