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Diffstat (limited to 'sysdeps/rs6000/sub_n.s')
| -rw-r--r-- | sysdeps/rs6000/sub_n.s | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/sysdeps/rs6000/sub_n.s b/sysdeps/rs6000/sub_n.s new file mode 100644 index 0000000000..402fdcefc4 --- /dev/null +++ b/sysdeps/rs6000/sub_n.s @@ -0,0 +1,55 @@ +# IBM POWER __mpn_sub_n -- Subtract two limb vectors of the same length > 0 and +# store difference in a third limb vector. + +# Copyright (C) 1992, 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 r3 +# s1_ptr r4 +# s2_ptr r5 +# size r6 + + .toc + .extern __mpn_sub_n[DS] + .extern .__mpn_sub_n +.csect [PR] + .align 2 + .globl __mpn_sub_n + .globl .__mpn_sub_n + .csect __mpn_sub_n[DS] +__mpn_sub_n: + .long .__mpn_sub_n, TOC[tc0], 0 + .csect [PR] +.__mpn_sub_n: + mtctr 6 # copy size into CTR + l 8,0(4) # load least significant s1 limb + l 0,0(5) # load least significant s2 limb + cal 3,-4(3) # offset res_ptr, it's updated before used + sf 7,0,8 # add least significant limbs, set cy + bdz Lend # If done, skip loop +Loop: lu 8,4(4) # load s1 limb and update s1_ptr + lu 0,4(5) # load s2 limb and update s2_ptr + stu 7,4(3) # store previous limb in load latecny slot + sfe 7,0,8 # add new limbs with cy, set cy + bdn Loop # decrement CTR and loop back +Lend: st 7,4(3) # store ultimate result limb + sfe 3,0,0 # load !cy into ... + sfi 3,3,0 # ... return value register + br |