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dnl PowerPC-32 mpn_add_n and mpn_sub_n.
dnl Copyright 2002, 2005, 2007 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU Lesser General Public License as published
dnl by the Free Software Foundation; either version 3 of the License, or (at
dnl your option) any later version.
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 Lesser General Public
dnl License for more details.
dnl You should have received a copy of the GNU Lesser General Public License
dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
include(`../config.m4')
C cycles/limb
C 603e: ?
C 604e: ? old: 3.25
C 75x (G3): ? old: 3.5
C 7400,7410 (G4): 3.25
C 744x,745x (G4+): 4
C power4/ppc970: ? old: 2.0
C power5: ? old: 2.5
C INPUT PARAMETERS
define(`rp', `r3')
define(`up', `r4')
define(`vp', `r5')
define(`n', `r6')
define(`cy', `r7')
ifdef(`OPERATION_add_n', `
define(ADCSBC, adde)
define(func, mpn_add_n)
define(func_nc, mpn_add_nc)
define(IFADD, `$1')
define(IFSUB, `')')
ifdef(`OPERATION_sub_n', `
define(ADCSBC, subfe)
define(func, mpn_sub_n)
define(func_nc, mpn_sub_nc)
define(IFADD, `')
define(IFSUB, `$1')')
MULFUNC_PROLOGUE(mpn_add_n mpn_add_nc mpn_sub_n mpn_sub_nc)
ASM_START()
PROLOGUE(func_nc)
IFADD(` addic r0, cy, -1') C set carry from argument
IFSUB(` subfic r0, cy, 0') C set carry from argument
b L(ent)
EPILOGUE()
PROLOGUE(func)
IFADD(` addic r0, n, 0') C clear carry
IFSUB(` addic r0, n, -1') C set carry
L(ent): andi. r0, n, 3
addi r3, r3, -12
addi n, n, 1
cmpwi cr7, r0, 2
srwi r0, n, 2
sub r4, r4, r3
sub r5, r5, r3
mtctr r0
bne cr0, L(n00)
lwzx r7, r4, r3 C n = 4, 8, 12, ...
lwzx r8, r5, r3
addi r3, r3, 4
lwzx r9, r4, r3
ADCSBC r7, r8, r7
lwzx r10, r5, r3
addi r3, r3, 4
b L(00)
L(n00): bge cr7, L(n01)
cmpwi cr0, r0, 0 C n = 1, 5, 9, 13, ...
lwzx r0, r4, r3
lwzx r6, r5, r3
addi r3, r3, 4
ADCSBC r0, r6, r0
ble L(ret)
L(gt1): lwzx r7, r4, r3
lwzx r8, r5, r3
addi r3, r3, 4
b L(01)
L(n10):
lwzx r9, r4, r3 C n = 3, 7, 11, 15, ...
lwzx r10, r5, r3
addi r3, r3, 4
lwzx r11, r4, r3
ADCSBC r9, r10, r9
lwzx r12, r5, r3
addi r3, r3, 4
b L(11)
L(n01): bne cr7, L(n10)
cmpwi cr0, r0, 0 C n = 2, 6, 10, 14, ...
lwzx r11, r4, r3
lwzx r12, r5, r3
addi r3, r3, 4
lwzx r0, r4, r3
ADCSBC r11, r12, r11
lwzx r6, r5, r3
addi r3, r3, 4
ble cr0, L(end)
L(lp): lwzx r7, r4, r3
ADCSBC r0, r6, r0
lwzx r8, r5, r3
stwu r11, 4(r3)
L(01): lwzx r9, r4, r3
ADCSBC r7, r8, r7
lwzx r10, r5, r3
stwu r0, 4(r3)
L(00): lwzx r11, r4, r3
ADCSBC r9, r10, r9
lwzx r12, r5, r3
stwu r7, 4(r3)
L(11): lwzx r0, r4, r3
ADCSBC r11, r12, r11
lwzx r6, r5, r3
stwu r9, 4(r3)
bdnz L(lp)
L(end): ADCSBC r0, r6, r0
stw r11, 4(r3)
L(ret): stw r0, 8(r3)
IFADD(` li r3, 0 ')
IFADD(` addze r3, r3 ')
IFSUB(` subfe r3, r0, r0')
IFSUB(` neg r3, r3')
blr
EPILOGUE()
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