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# PowerPC-64 mpn_sub_n -- Subtract two limb vectors of the same length > 0
# and store difference in a third limb vector.
# Copyright (C) 1999, 2000 Free Software Foundation, Inc.b
# 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 Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 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 Lesser General Public
# License for more details.
# You should have received a copy of the GNU Lesser General Public License
# along with the GNU MP Library; see the file COPYING.LIB. If not, write to
# the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
# MA 02111-1307, USA.
# INPUT PARAMETERS
# res_ptr r3
# s1_ptr r4
# s2_ptr r5
# size r6
include(`../config.m4')
ASM_START()
PROLOGUE(mpn_sub_n)
mtctr r6 # copy size into CTR
addic r0,r6,-1 # set cy
ld r8,0(r4) # load least significant s1 limb
ld r0,0(r5) # load least significant s2 limb
addi r3,r3,-8 # offset res_ptr, it's updated before it's used
bdz .Lend # If done, skip loop
.Loop: ld r9,8(r4) # load s1 limb
ld r10,8(r5) # load s2 limb
subfe r7,r0,r8 # subtract limbs with cy, set cy
std r7,8(r3) # store result limb
bdz .Lexit # decrement CTR and exit if done
ldu r8,16(r4) # load s1 limb and update s1_ptr
ldu r0,16(r5) # load s2 limb and update s2_ptr
subfe r7,r10,r9 # subtract limbs with cy, set cy
stdu r7,16(r3) # store result limb and update res_ptr
bdnz .Loop # decrement CTR and loop back
.Lend: subfe r7,r0,r8
std r7,8(r3) # store ultimate result limb
subfe r3,r0,r0 # load !cy into ...
subfic r3,r3,0 # ... return value register
blr
.Lexit: subfe r7,r10,r9
std r7,16(r3)
subfe r3,r0,r0 # load !cy into ...
subfic r3,r3,0 # ... return value register
blr
EPILOGUE(mpn_sub_n)
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