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dnl S/390-32 mpn_addlsh1_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 9.25
C z990 5
C z9 ?
C z10 ?
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(ADDSUBC, alr)
define(ADDSUBE, alcr)
define(INITCY, `lhi %r13, -1')
define(RETVAL, `alr %r1, %r13
lhi %r2, 2
alr %r2, %r1')
define(func, mpn_addlsh1_n)
')
ifdef(`OPERATION_sublsh1_n',`
define(ADDSUBC, slr)
define(ADDSUBE, slbr)
define(INITCY, `lhi %r13, 0')
define(RETVAL, `slr %r1, %r13
lhi %r2, 1
alr %r2, %r1')
define(func, mpn_sublsh1_n)
')
MULFUNC_PROLOGUE(mpn_addlsh1_n mpn_sublsh1_n)
ASM_START()
PROLOGUE(func)
stm %r6, %r13, 24(%r15)
la %r0, 3(n)
lhi %r7, 3
srl %r0, 2
nr %r7, n C n mod 4
je L(b0)
chi %r7, 2
jl L(b1)
je L(b2)
L(b3): lm %r5, %r7, 0(up)
la up, 12(up)
lm %r9, %r11, 0(vp)
la vp, 12(vp)
alr %r9, %r9
alcr %r10, %r10
alcr %r11, %r11
slbr %r1, %r1
ADDSUBC %r5, %r9
ADDSUBE %r6, %r10
ADDSUBE %r7, %r11
slbr %r13, %r13
stm %r5, %r7, 0(rp)
la rp, 12(rp)
brct %r0, L(top)
j L(end)
L(b0): lhi %r1, -1
INITCY
j L(top)
L(b1): l %r5, 0(up)
la up, 4(up)
l %r9, 0(vp)
la vp, 4(vp)
alr %r9, %r9
slbr %r1, %r1
ADDSUBC %r5, %r9
slbr %r13, %r13
st %r5, 0(rp)
la rp, 4(rp)
brct %r0, L(top)
j L(end)
L(b2): lm %r5, %r6, 0(up)
la up, 8(up)
lm %r9, %r10, 0(vp)
la vp, 8(vp)
alr %r9, %r9
alcr %r10, %r10
slbr %r1, %r1
ADDSUBC %r5, %r9
ADDSUBE %r6, %r10
slbr %r13, %r13
stm %r5, %r6, 0(rp)
la rp, 8(rp)
brct %r0, L(top)
j L(end)
L(top): lm %r9, %r12, 0(vp)
la vp, 16(vp)
ahi %r1, 1 C restore carry
alcr %r9, %r9
alcr %r10, %r10
alcr %r11, %r11
alcr %r12, %r12
slbr %r1, %r1 C save carry
lm %r5, %r8, 0(up)
la up, 16(up)
ahi %r13, 1 C restore carry
ADDSUBE %r5, %r9
ADDSUBE %r6, %r10
ADDSUBE %r7, %r11
ADDSUBE %r8, %r12
slbr %r13, %r13
stm %r5, %r8, 0(rp)
la rp, 16(rp)
brct %r0, L(top)
L(end):
RETVAL
lm %r6, %r13, 24(%r15)
br %r14
EPILOGUE()
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