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! SH2 __mpn_submul_1 -- Multiply a limb vector with a limb and subtract
! the result from a second limb vector.
! Copyright (C) 1995 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., 59 Temple Place - Suite 330, Boston,
! MA 02111-1307, USA.
! INPUT PARAMETERS
! res_ptr r4
! s1_ptr r5
! size r6
! s2_limb r7
.text
.align 1
.global ___mpn_submul_1
___mpn_submul_1:
mov #0,r2 ! cy_limb = 0
mov #0,r0 ! Keep r0 = 0 for entire loop
clrt
Loop: mov.l @r5+,r3
dmulu.l r3,r7
sts macl,r1
addc r2,r1 ! lo_prod += old cy_limb
sts mach,r2 ! new cy_limb = hi_prod
mov.l @r4,r3
addc r0,r2 ! cy_limb += T, T = 0
subc r3,r1
addc r0,r2 ! cy_limb += T, T = 0
dt r6
mov.l r1,@r4
bf.s Loop
add #4,r4
rts
mov r2,r0
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