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dnl S/390-64 mpn_copyd
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 2.67
C z990 1.5
C z9 ?
C z10 1.8
C z196 ?
C FIXME:
C * Avoid saving/restoring callee-saves registers for n < 3. This could be
C done by setting rp=r1, up=r2, i=r0 and r3,r4,r5 for clock regs.
C We could then use r3...r10 in main loop.
C * Could we use some EX trick, modifying lmg/stmg, for the feed-in code?
C INPUT PARAMETERS
define(`rp_param', `%r2')
define(`up_param', `%r3')
define(`n', `%r4')
define(`rp', `%r8')
define(`up', `%r9')
ASM_START()
PROLOGUE(mpn_copyd)
stmg %r6, %r11, 48(%r15)
sllg %r1, n, 3
la %r10, 8(n)
aghi %r1, -64
srlg %r10, %r10, 3
lghi %r11, -64
la rp, 0(%r1,rp_param) C FIXME use lay on z990 and later
la up, 0(%r1,up_param) C FIXME use lay on z990 and later
lghi %r7, 7
ngr %r7, n C n mod 8
cghi %r7, 2
jh L(b34567)
cghi %r7, 1
je L(b1)
jh L(b2)
L(b0): brctg %r10, L(top)
j L(end)
L(b1): lg %r0, 56(up)
aghi up, -8
stg %r0, 56(rp)
aghi rp, -8
brctg %r10, L(top)
j L(end)
L(b2): lmg %r0, %r1, 48(up)
aghi up, -16
stmg %r0, %r1, 48(rp)
aghi rp, -16
brctg %r10, L(top)
j L(end)
L(b34567):
cghi %r7, 4
jl L(b3)
je L(b4)
cghi %r7, 6
je L(b6)
jh L(b7)
L(b5): lmg %r0, %r4, 24(up)
aghi up, -40
stmg %r0, %r4, 24(rp)
aghi rp, -40
brctg %r10, L(top)
j L(end)
L(b3): lmg %r0, %r2, 40(up)
aghi up, -24
stmg %r0, %r2, 40(rp)
aghi rp, -24
brctg %r10, L(top)
j L(end)
L(b4): lmg %r0, %r3, 32(up)
aghi up, -32
stmg %r0, %r3, 32(rp)
aghi rp, -32
brctg %r10, L(top)
j L(end)
L(b6): lmg %r0, %r5, 16(up)
aghi up, -48
stmg %r0, %r5, 16(rp)
aghi rp, -48
brctg %r10, L(top)
j L(end)
L(b7): lmg %r0, %r6, 8(up)
aghi up, -56
stmg %r0, %r6, 8(rp)
aghi rp, -56
brctg %r10, L(top)
j L(end)
L(top): lmg %r0, %r7, 0(up)
la up, 0(%r11,up)
stmg %r0, %r7, 0(rp)
la rp, 0(%r11,rp)
brctg %r10, L(top)
L(end): lmg %r6, %r11, 48(%r15)
br %r14
EPILOGUE()
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