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dnl PowerPC-64 mpn_add_n, mpn_sub_n optimised for POWER7.
dnl Copyright 2013 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 POWER3/PPC630 ?
C POWER4/PPC970 ?
C POWER5 ?
C POWER6 ?
C POWER7 2.18
C This is a tad bit slower than the cnd_aors_n.asm code, which is of course an
C anomaly.
ifdef(`OPERATION_add_n',`
define(ADDSUBC, adde)
define(ADDSUB, addc)
define(func, mpn_add_n)
define(func_nc, mpn_add_nc)
define(GENRVAL, `addi r3, r3, 1')
define(SETCBR, `addic r0, $1, -1')
define(CLRCB, `addic r0, r0, 0')
')
ifdef(`OPERATION_sub_n',`
define(ADDSUBC, subfe)
define(ADDSUB, subfc)
define(func, mpn_sub_n)
define(func_nc, mpn_sub_nc)
define(GENRVAL, `neg r3, r3')
define(SETCBR, `subfic r0, $1, 0')
define(CLRCB, `addic r0, r1, -1')
')
MULFUNC_PROLOGUE(mpn_add_n mpn_add_nc mpn_sub_n mpn_sub_nc)
C INPUT PARAMETERS
define(`rp', `r3')
define(`up', `r4')
define(`vp', `r5')
define(`n', `r6')
ASM_START()
PROLOGUE(func_nc)
SETCBR(r7)
b L(ent)
EPILOGUE()
PROLOGUE(func)
CLRCB
L(ent):
andi. r7, n, 1
beq L(bx0)
L(bx1): ld r7, 0(up)
ld r9, 0(vp)
ADDSUBC r11, r9, r7
std r11, 0(rp)
cmpldi cr6, n, 1
beq cr6, L(end)
addi up, up, 8
addi vp, vp, 8
addi rp, rp, 8
L(bx0): addi r0, n, 2 C compute branch...
srdi r0, r0, 2 C ...count
mtctr r0
andi. r7, n, 2
bne L(mid)
addi up, up, 16
addi vp, vp, 16
addi rp, rp, 16
ALIGN(32)
L(top): ld r6, -16(up)
ld r7, -8(up)
ld r8, -16(vp)
ld r9, -8(vp)
ADDSUBC r10, r8, r6
ADDSUBC r11, r9, r7
std r10, -16(rp)
std r11, -8(rp)
L(mid): ld r6, 0(up)
ld r7, 8(up)
ld r8, 0(vp)
ld r9, 8(vp)
ADDSUBC r10, r8, r6
ADDSUBC r11, r9, r7
std r10, 0(rp)
std r11, 8(rp)
addi up, up, 32
addi vp, vp, 32
addi rp, rp, 32
bdnz L(top)
L(end): subfe r3, r0, r0 C -cy
GENRVAL
blr
EPILOGUE()
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