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dnl PowerPC-64 mpn_rsh1add_n, mpn_rsh1sub_n
dnl Copyright 2003, 2005, 2010, 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 2.9
C POWER5 ?
C POWER6 3.5
C POWER7 2.25
define(`rp', `r3')
define(`up', `r4')
define(`vp', `r5')
define(`n', `r6')
ifdef(`OPERATION_rsh1add_n', `
define(`ADDSUBC', `addc')
define(`ADDSUBE', `adde')
define(INITCY, `addic $1, r1, 0')
define(`func', mpn_rsh1add_n)')
ifdef(`OPERATION_rsh1sub_n', `
define(`ADDSUBC', `subfc')
define(`ADDSUBE', `subfe')
define(INITCY, `addic $1, r1, -1')
define(`func', mpn_rsh1sub_n)')
define(`s0', `r9')
define(`s1', `r7')
define(`x0', `r0')
define(`x1', `r12')
define(`u0', `r8')
define(`v0', `r10')
MULFUNC_PROLOGUE(mpn_rsh1add_n mpn_rsh1sub_n)
ASM_START()
PROLOGUE(func)
ld u0, 0(up)
ld v0, 0(vp)
cmpdi cr6, n, 2
addi r0, n, 1
srdi r0, r0, 2
mtctr r0 C copy size to count register
andi. r0, n, 1
bne cr0, L(bx1)
L(bx0): ADDSUBC x1, v0, u0
ld u0, 8(up)
ld v0, 8(vp)
ADDSUBE x0, v0, u0
ble cr6, L(n2)
ld u0, 16(up)
ld v0, 16(vp)
srdi s0, x1, 1
rldicl r11, x1, 0, 63 C return value
ADDSUBE x1, v0, u0
andi. n, n, 2
bne cr0, L(b10)
L(b00): addi rp, rp, -24
b L(lo0)
L(b10): addi up, up, 16
addi vp, vp, 16
addi rp, rp, -8
b L(lo2)
ALIGN(16)
L(bx1): ADDSUBC x0, v0, u0
ble cr6, L(n1)
ld u0, 8(up)
ld v0, 8(vp)
ADDSUBE x1, v0, u0
ld u0, 16(up)
ld v0, 16(vp)
srdi s1, x0, 1
rldicl r11, x0, 0, 63 C return value
ADDSUBE x0, v0, u0
andi. n, n, 2
bne cr0, L(b11)
L(b01): addi up, up, 8
addi vp, vp, 8
addi rp, rp, -16
b L(lo1)
L(b11): addi up, up, 24
addi vp, vp, 24
bdz L(end)
ALIGN(32)
L(top): ld u0, 0(up)
ld v0, 0(vp)
srdi s0, x1, 1
rldimi s1, x1, 63, 0
std s1, 0(rp)
ADDSUBE x1, v0, u0
L(lo2): ld u0, 8(up)
ld v0, 8(vp)
srdi s1, x0, 1
rldimi s0, x0, 63, 0
std s0, 8(rp)
ADDSUBE x0, v0, u0
L(lo1): ld u0, 16(up)
ld v0, 16(vp)
srdi s0, x1, 1
rldimi s1, x1, 63, 0
std s1, 16(rp)
ADDSUBE x1, v0, u0
L(lo0): ld u0, 24(up)
ld v0, 24(vp)
srdi s1, x0, 1
rldimi s0, x0, 63, 0
std s0, 24(rp)
ADDSUBE x0, v0, u0
addi up, up, 32
addi vp, vp, 32
addi rp, rp, 32
bdnz L(top)
L(end): srdi s0, x1, 1
rldimi s1, x1, 63, 0
std s1, 0(rp)
L(cj2): srdi s1, x0, 1
rldimi s0, x0, 63, 0
std s0, 8(rp)
L(cj1): ADDSUBE x1, x1, x1 C pseudo-depends on x1
rldimi s1, x1, 63, 0
std s1, 16(rp)
mr r3, r11
blr
L(n1): srdi s1, x0, 1
rldicl r11, x0, 0, 63 C return value
ADDSUBE x1, x1, x1 C pseudo-depends on x1
rldimi s1, x1, 63, 0
std s1, 0(rp)
mr r3, r11
blr
L(n2): addi rp, rp, -8
srdi s0, x1, 1
rldicl r11, x1, 0, 63 C return value
b L(cj2)
EPILOGUE()
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