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dnl SH2 mpn_submul_1 -- Multiply a limb vector with a limb and subtract the
dnl result from a second limb vector.
dnl Copyright 1995, 2000, 2011 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of either:
dnl
dnl * the GNU Lesser General Public License as published by the Free
dnl Software Foundation; either version 3 of the License, or (at your
dnl option) any later version.
dnl
dnl or
dnl
dnl * the GNU General Public License as published by the Free Software
dnl Foundation; either version 2 of the License, or (at your option) any
dnl later version.
dnl
dnl or both in parallel, as here.
dnl
dnl The GNU MP Library is distributed in the hope that it will be useful, but
dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
dnl for more details.
dnl
dnl You should have received copies of the GNU General Public License and the
dnl GNU Lesser General Public License along with the GNU MP Library. If not,
dnl see https://www.gnu.org/licenses/.
include(`../config.m4')
C INPUT PARAMETERS
C res_ptr r4
C s1_ptr r5
C size r6
C s2_limb r7
changecom(blah) C disable # to make all C comments below work
ASM_START()
PROLOGUE(mpn_submul_1)
mov #0,r2 C cy_limb = 0
mov #0,r0 C Keep r0 = 0 for entire loop
clrt
L(top): mov.l @r5+,r3
dmulu.l r3,r7
sts macl,r1
addc r2,r1 C lo_prod += old cy_limb
sts mach,r2 C new cy_limb = hi_prod
mov.l @r4,r3
addc r0,r2 C cy_limb += T, T = 0
subc r1,r3
addc r0,r2 C cy_limb += T, T = 0
dt r6
mov.l r3,@r4
bf.s L(top)
add #4,r4
rts
mov r2,r0
EPILOGUE()
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