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dnl S/390 mpn_mul_1 -- Multiply a limb vector with a limb and store the
dnl result in a second limb vector.
dnl Copyright 2001 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU Lesser General Public License as published
dnl by the Free Software Foundation; either version 3 of the License, or (at
dnl your option) any later version.
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 Lesser General Public
dnl License for more details.
dnl You should have received a copy of the GNU Lesser General Public License
dnl along with the GNU MP Library. If not, see http://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_mul_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
lr cylimb,0 # new cylimb
st 1,0(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
lr cylimb,0 # new cylimb
st 1,0(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_mul_1)
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