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dnl S/390-32 mpn_rshift.
dnl Copyright 2011 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')
C cycles/limb
C z900 6
C z990 3
C z9 ?
C z10 ?
C z196 ?
C TODO
C *
C INPUT PARAMETERS
define(`rp', `%r2')
define(`up', `%r3')
define(`n', `%r4')
define(`cnt', `%r5')
ASM_START()
PROLOGUE(mpn_rshift)
stm %r6, %r12, 24(%r15)
lhi %r8, 32
sr %r8, cnt
l %r12, 0(up)
sll %r12, 0(%r8) C return value
lhi %r7, 3
nr %r7, n
srl n, 2
je L(b0)
chi %r7, 2
jl L(b1)
je L(b2)
L(b3): l %r11, 0(up)
l %r10, 4(up)
l %r8, 8(up)
ahi up, 8
lr %r9, %r10
srdl %r10, 0(cnt)
srdl %r8, 0(cnt)
st %r11, 0(rp)
st %r9, 4(rp)
ahi rp, 8
ltr n, n
je L(end)
j L(top)
L(b2): l %r11, 0(up)
l %r10, 4(up)
ahi up, 4
srdl %r10, 0(cnt)
st %r11, 0(rp)
ahi rp, 4
ltr n, n
je L(end)
j L(top)
L(b1): ltr n, n
je L(end)
j L(top)
L(b0): l %r11, 0(up)
l %r9, 4(up)
l %r7, 8(up)
l %r1, 12(up)
ahi up, 12
lr %r10, %r9
lr %r8, %r7
lr %r6, %r1
srdl %r10, 0(cnt)
srdl %r8, 0(cnt)
srdl %r6, 0(cnt)
st %r11, 0(rp)
st %r9, 4(rp)
st %r7, 8(rp)
ahi rp, 12
ahi n, -1
je L(end)
ALIGN(8)
L(top): l %r11, 0(up)
l %r9, 4(up)
l %r7, 8(up)
l %r1, 12(up)
l %r0, 16(up)
lr %r10, %r9
lr %r8, %r7
lr %r6, %r1
ahi up, 16
srdl %r10, 0(cnt)
srdl %r8, 0(cnt)
srdl %r6, 0(cnt)
srdl %r0, 0(cnt)
st %r11, 0(rp)
st %r9, 4(rp)
st %r7, 8(rp)
st %r1, 12(rp)
ahi rp, 16
brct n, L(top)
L(end): l %r11, 0(up)
srl %r11, 0(cnt)
st %r11, 0(rp)
lr %r2, %r12
lm %r6, %r12, 24(%r15)
br %r14
EPILOGUE()
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