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# Multiply a limb vector by a single limb, for PowerPC.
# Copyright (C) 1993, 1994, 1995, 1997 Free Software Foundation, Inc.
# This file is part of the GNU C Library.
#
# The GNU C 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 C 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 C 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.
# mp_limb_t mpn_submul_1 (mp_ptr res_ptr, mp_srcptr s1_ptr,
# mp_size_t s1_size, mp_limb_t s2_limb)
# Calculate res-s1*s2 and put result back in res; return carry.
.align 2
.globl __mpn_submul_1
.type __mpn_submul_1,@function
__mpn_submul_1:
mtctr %r5
lwz %r0,0(%r4)
mullw %r7,%r0,%r6
mulhwu %r10,%r0,%r6
lwz %r9,0(%r3)
subf %r8,%r7,%r9
addc %r7,%r7,%r8 # invert cy (r7 is junk)
addi %r3,%r3,-4 # adjust res_ptr
bdz Lend
Loop: lwzu %r0,4(%r4)
stwu %r8,4(%r3)
mullw %r8,%r0,%r6
adde %r7,%r8,%r10
mulhwu %r10,%r0,%r6
lwz %r9,4(%r3)
addze %r10,%r10
subf %r8,%r7,%r9
addc %r7,%r7,%r8 # invert cy (r7 is junk)
bdnz Loop
Lend: stw %r8,4(%r3)
addze %r3,%r10
blr
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