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dnl S/390 mpn_submul_1 -- Multiply a limb vector with a limb and subtract the
dnl result from a second limb vector.
dnl Copyright 2001 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')
define(`rp',2)
define(`up',3)
define(`n',4)
define(`vlimb',5)
define(`cylimb',7)
ASM_START()
PROLOGUE(mpn_submul_1)
stm 6,7,24(15)
slr cylimb,cylimb # clear cylimb
ltr vlimb,vlimb
jnl .Loopp
.Loopn: l 1,0(up) # load from u
lr 6,1 #
mr 0,vlimb # multiply signed
alr 0,6 # add vlimb to phi
sra 6,31 # make mask
nr 6,vlimb # 0 or vlimb
alr 0,6 # conditionally add vlimb to phi
alr 1,cylimb # add carry limb to plo
brc 8+4,+8 # branch if not carry
ahi 0,1 # increment phi
l 6,0(rp) # load r limb
slr 6,1 # add u limb to plo
brc 2+1,+8 # branch if not carry
ahi 0,1 # increment phi
lr cylimb,0 # new cylimb
st 6,0(rp) # store
la up,4(,up)
la rp,4(,rp)
brct n,.Loopn
lr 2,cylimb
lm 6,7,24(15)
br 14
.Loopp: l 1,0(up) # load from u
lr 6,1 #
mr 0,vlimb # multiply signed
sra 6,31 # make mask
nr 6,vlimb # 0 or vlimb
alr 0,6 # conditionally add vlimb to phi
alr 1,cylimb # add carry limb to plo
brc 8+4,+8 # branch if not carry
ahi 0,1 # increment phi
l 6,0(rp) # load r limb
slr 6,1 # add u limb to plo
brc 2+1,+8 # branch if not carry
ahi 0,1 # increment phi
lr cylimb,0 # new cylimb
st 6,0(rp) # store
la up,4(,up)
la rp,4(,rp)
brct n,.Loopp
lr 2,cylimb
lm 6,7,24(15)
br 14
EPILOGUE(mpn_submul_1)
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