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dnl S/390-32/esame mpn_mul_basecase.
dnl Copyright 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 cycles/limb
C z900 ?
C z990 ?
C z9 ?
C z10 ?
C z196 ?
C TODO
C * Perhaps add special case for un <= 2.
C * Replace loops by faster code. The mul_1 and addmul_1 loops could be sped
C up by about 10%.
C INPUT PARAMETERS
define(`rp', `%r2')
define(`up', `%r3')
define(`un', `%r4')
define(`vp', `%r5')
define(`vn', `%r6')
define(`zero', `%r8')
ASM_START()
PROLOGUE(mpn_mul_basecase)
chi un, 2
jhe L(ge2)
C un = vn = 1
l %r1, 0(vp)
ml %r0, 0(up)
st %r1, 0(rp)
st %r0, 4(rp)
br %r14
L(ge2): C jne L(gen)
L(gen):
C mul_1 =======================================================================
stm %r6, %r12, 24(%r15)
lhi zero, 0
ahi un, -1
l %r7, 0(vp)
l %r11, 0(up)
lhi %r12, 4 C init index register
mlr %r10, %r7
lr %r9, un
st %r11, 0(rp)
cr %r15, %r15 C clear carry flag
L(tm): l %r1, 0(%r12,up)
mlr %r0, %r7
alcr %r1, %r10
lr %r10, %r0 C copy high part to carry limb
st %r1, 0(%r12,rp)
la %r12, 4(%r12)
brct %r9, L(tm)
alcr %r0, zero
st %r0, 0(%r12,rp)
C addmul_1 loop ===============================================================
ahi vn, -1
je L(outer_end)
L(outer_loop):
la rp, 4(rp) C rp += 1
la vp, 4(vp) C up += 1
l %r7, 0(vp)
l %r11, 0(up)
lhi %r12, 4 C init index register
mlr %r10, %r7
lr %r9, un
al %r11, 0(rp)
st %r11, 0(rp)
L(tam): l %r1, 0(%r12,up)
l %r11, 0(%r12,rp)
mlr %r0, %r7
alcr %r1, %r11
alcr %r0, zero
alr %r1, %r10
lr %r10, %r0
st %r1, 0(%r12,rp)
la %r12, 4(%r12)
brct %r9, L(tam)
alcr %r0, zero
st %r0, 0(%r12,rp)
brct vn, L(outer_loop)
L(outer_end):
lm %r6, %r12, 24(%r15)
br %r14
EPILOGUE()
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