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dnl S/390-64 mpn_lshift.
dnl Copyright 2011, 2012, 2014 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 7
C z990 3
C z9 ?
C z10 6
C z196 ?
C NOTES
C * This uses discrete loads and stores in a software pipeline. Using lmg and
C stmg is not faster.
C * One could assume more pipelining could approach 2.5 c/l, but we have not
C found any 8-way loop that runs better than the current 4-way loop.
C * Consider using the same feed-in code for 1 <= n <= 3 as for n mod 4,
C similarly to the x86_64 sqr_basecase feed-in.
C INPUT PARAMETERS
define(`rp', `%r2')
define(`up', `%r3')
define(`n', `%r4')
define(`cnt', `%r5')
define(`tnc', `%r6')
ASM_START()
PROLOGUE(mpn_lshift)
cghi n, 3
jh L(gt1)
stmg %r6, %r7, 48(%r15)
larl %r1, L(tab)-4
lcgr tnc, cnt
sllg n, n, 2
b 0(n,%r1)
L(tab): j L(n1)
j L(n2)
j L(n3)
L(n1): lg %r1, 0(up)
sllg %r0, %r1, 0(cnt)
stg %r0, 0(rp)
srlg %r2, %r1, 0(tnc)
lg %r6, 48(%r15) C restoring r7 not needed
br %r14
L(n2): lg %r1, 8(up)
srlg %r4, %r1, 0(tnc)
sllg %r0, %r1, 0(cnt)
j L(cj)
L(n3): lg %r1, 16(up)
srlg %r4, %r1, 0(tnc)
sllg %r0, %r1, 0(cnt)
lg %r1, 8(up)
srlg %r7, %r1, 0(tnc)
ogr %r7, %r0
sllg %r0, %r1, 0(cnt)
stg %r7, 16(rp)
L(cj): lg %r1, 0(up)
srlg %r7, %r1, 0(tnc)
ogr %r7, %r0
sllg %r0, %r1, 0(cnt)
stg %r7, 8(rp)
stg %r0, 0(rp)
lgr %r2, %r4
lmg %r6, %r7, 48(%r15)
br %r14
L(gt1): stmg %r6, %r13, 48(%r15)
lcgr tnc, cnt C tnc = -cnt
sllg %r1, n, 3
srlg %r0, n, 2 C loop count
agr up, %r1 C point up at end of U
agr rp, %r1 C point rp at end of R
aghi up, -56
aghi rp, -40
lghi %r7, 3
ngr %r7, n
je L(b0)
cghi %r7, 2
jl L(b1)
je L(b2)
L(b3): lg %r7, 48(up)
srlg %r9, %r7, 0(tnc)
sllg %r11, %r7, 0(cnt)
lg %r8, 40(up)
lg %r7, 32(up)
srlg %r4, %r8, 0(tnc)
sllg %r13, %r8, 0(cnt)
ogr %r11, %r4
la rp, 16(rp)
j L(lm3)
L(b2): lg %r8, 48(up)
lg %r7, 40(up)
srlg %r9, %r8, 0(tnc)
sllg %r13, %r8, 0(cnt)
la rp, 24(rp)
la up, 8(up)
j L(lm2)
L(b1): lg %r7, 48(up)
srlg %r9, %r7, 0(tnc)
sllg %r11, %r7, 0(cnt)
lg %r8, 40(up)
lg %r7, 32(up)
srlg %r4, %r8, 0(tnc)
sllg %r10, %r8, 0(cnt)
ogr %r11, %r4
la rp, 32(rp)
la up, 16(up)
j L(lm1)
L(b0): lg %r8, 48(up)
lg %r7, 40(up)
srlg %r9, %r8, 0(tnc)
sllg %r10, %r8, 0(cnt)
la rp, 40(rp)
la up, 24(up)
j L(lm0)
ALIGN(8)
L(top): srlg %r4, %r8, 0(tnc)
sllg %r13, %r8, 0(cnt)
ogr %r11, %r4
stg %r10, 24(rp)
L(lm3): stg %r11, 16(rp)
L(lm2): srlg %r12, %r7, 0(tnc)
sllg %r11, %r7, 0(cnt)
lg %r8, 24(up)
lg %r7, 16(up)
ogr %r13, %r12
srlg %r4, %r8, 0(tnc)
sllg %r10, %r8, 0(cnt)
ogr %r11, %r4
stg %r13, 8(rp)
L(lm1): stg %r11, 0(rp)
L(lm0): srlg %r12, %r7, 0(tnc)
aghi rp, -32
sllg %r11, %r7, 0(cnt)
lg %r8, 8(up)
lg %r7, 0(up)
aghi up, -32
ogr %r10, %r12
brctg %r0, L(top)
L(end): srlg %r4, %r8, 0(tnc)
sllg %r13, %r8, 0(cnt)
ogr %r11, %r4
stg %r10, 24(rp)
stg %r11, 16(rp)
srlg %r12, %r7, 0(tnc)
sllg %r11, %r7, 0(cnt)
ogr %r13, %r12
stg %r13, 8(rp)
stg %r11, 0(rp)
lgr %r2, %r9
lmg %r6, %r13, 48(%r15)
br %r14
EPILOGUE()
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