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dnl S/390-64 mpn_sublsh1_n
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 10
C z990 5
C z9 ?
C z10 12
C z196 ?
C TODO
C * Optimise for small n
C * Compute RETVAL for sublsh1_n less stupidly
C INPUT PARAMETERS
define(`rp', `%r2')
define(`up', `%r3')
define(`vp', `%r4')
define(`n', `%r5')
ifdef(`OPERATION_addlsh1_n',`
define(ADSBR, algr)
define(ADSBCR, alcgr)
define(INITCY, `lghi %r13, -1')
define(RETVAL, `la %r2, 2(%r1,%r13)')
define(func, mpn_addlsh1_n)
')
ifdef(`OPERATION_sublsh1_n',`
define(ADSBR, slgr)
define(ADSBCR, slbgr)
define(INITCY, `lghi %r13, 0')
define(RETVAL,`dnl
slgr %r1, %r13
lghi %r2, 1
algr %r2, %r1')
define(func, mpn_sublsh1_n)
')
ASM_START()
PROLOGUE(mpn_sublsh1_n)
stmg %r6, %r13, 48(%r15)
aghi n, 3
lghi %r7, 3
srlg %r0, n, 2
ngr %r7, n C n mod 4
je L(b1)
cghi %r7, 2
jl L(b2)
jne L(b0)
L(b3): lmg %r5, %r7, 0(up)
la up, 24(up)
lmg %r9, %r11, 0(vp)
la vp, 24(vp)
algr %r9, %r9
alcgr %r10, %r10
alcgr %r11, %r11
slbgr %r1, %r1
ADSBR %r5, %r9
ADSBCR %r6, %r10
ADSBCR %r7, %r11
slbgr %r13, %r13
stmg %r5, %r7, 0(rp)
la rp, 24(rp)
brctg %r0, L(top)
j L(end)
L(b0): lghi %r1, -1
INITCY
j L(top)
L(b1): lg %r5, 0(up)
la up, 8(up)
lg %r9, 0(vp)
la vp, 8(vp)
algr %r9, %r9
slbgr %r1, %r1
ADSBR %r5, %r9
slbgr %r13, %r13
stg %r5, 0(rp)
la rp, 8(rp)
brctg %r0, L(top)
j L(end)
L(b2): lmg %r5, %r6, 0(up)
la up, 16(up)
lmg %r9, %r10, 0(vp)
la vp, 16(vp)
algr %r9, %r9
alcgr %r10, %r10
slbgr %r1, %r1
ADSBR %r5, %r9
ADSBCR %r6, %r10
slbgr %r13, %r13
stmg %r5, %r6, 0(rp)
la rp, 16(rp)
brctg %r0, L(top)
j L(end)
L(top): lmg %r9, %r12, 0(vp)
la vp, 32(vp)
aghi %r1, 1 C restore carry
alcgr %r9, %r9
alcgr %r10, %r10
alcgr %r11, %r11
alcgr %r12, %r12
slbgr %r1, %r1 C save carry
lmg %r5, %r8, 0(up)
la up, 32(up)
aghi %r13, 1 C restore carry
ADSBCR %r5, %r9
ADSBCR %r6, %r10
ADSBCR %r7, %r11
ADSBCR %r8, %r12
slbgr %r13, %r13 C save carry
stmg %r5, %r8, 0(rp)
la rp, 32(rp)
brctg %r0, L(top)
L(end): RETVAL
lmg %r6, %r13, 48(%r15)
br %r14
EPILOGUE()
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