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dnl PowerPC-32 mpn_sub_n -- subtract limb vectors.
dnl Copyright 2002, 2005 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 2.1 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; see the file COPYING.LIB. If not, write to
dnl the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
dnl MA 02111-1307, USA.
include(`../config.m4')
C cycles/limb
C 603e: ?
C 604e: 3.25
C 75x (G3): 3.5
C 7400,7410 (G4): 3.5
C 744x,745x (G4+): 4.25
C power4/ppc970: 2.0
C power5: 2.5
C INPUT PARAMETERS
C rp r3
C s1p r4
C s2p r5
C n r6
C cy r7
ASM_START()
PROLOGUE(mpn_sub_nc)
subfic r0,r7,0 C set hw cy from cy argument
cmpwi cr0,r6,15 C more than 15 limbs?
ble L(com) C branch if <= 15 limbs
b L(BIG)
EPILOGUE(mpn_sub_nc)
PROLOGUE(mpn_sub_n)
subfc r0,r0,r0 C set hw cy
cmpwi cr0,r6,15 C more than 15 limbs?
bgt L(BIG) C branch if > 15 limbs
L(com): mtctr r6 C copy size into CTR
addi r3,r3,-4 C offset rp, it's updated before it's used
lwz r0,0(r4) C load s1 limb
lwz r7,0(r5) C load s2 limb
subfe r10,r7,r0
bdz L(endS)
L(loopS):
lwzu r0,4(r4) C load s1 limb
lwzu r7,4(r5) C load s2 limb
stwu r10,4(r3) C store result limb
subfe r10,r7,r0
bdnz L(loopS)
L(endS):
stwu r10,4(r3) C store result limb
subfe r3, r0, r0 C 0 or -1
subfic r3, r3, 0 C 0 or 1
blr
L(BIG):
stmw r30,-8(r1) C should avoid this for small sizes!
andi. r12,r6,3
mtctr r12 C copy size into CTR
addi r4,r4,-4
addi r5,r5,-4
addi r3,r3,-4
beq L(multiple_of_4)
lwzu r0,4(r4) C load s1 limb
lwzu r7,4(r5) C load s2 limb
subfe r10,r7,r0
bdz L(end0)
L(loop0):
lwzu r0,4(r4) C load s1 limb
lwzu r7,4(r5) C load s2 limb
stwu r10,4(r3) C store result limb
subfe r10,r7,r0
bdnz L(loop0)
L(end0):
stwu r10,4(r3) C store result limb
L(multiple_of_4):
srwi r6,r6,2
mtctr r6 C copy size into CTR
lwz r0,4(r4) C load s1 limb
lwz r7,4(r5) C load s2 limb
lwz r8,8(r4) C load s1 limb
lwz r9,8(r5) C load s2 limb
lwz r10,12(r4) C load s1 limb
lwz r11,12(r5) C load s2 limb
lwzu r12,16(r4) C load s1 limb
subfe r31,r7,r0 C add limbs with cy, set cy
lwzu r6,16(r5) C load s2 limb
bdz L(enda)
L(loop):
lwz r0,4(r4) C load s1 limb
subfe r30,r9,r8 C add limbs with cy, set cy
lwz r7,4(r5) C load s2 limb
stw r31,4(r3) C store result limb
lwz r8,8(r4) C load s1 limb
subfe r31,r11,r10 C add limbs with cy, set cy
lwz r9,8(r5) C load s2 limb
stw r30,8(r3) C store result limb
lwz r10,12(r4) C load s1 limb
subfe r30,r6,r12 C add limbs with cy, set cy
lwz r11,12(r5) C load s2 limb
stw r31,12(r3) C store result limb
lwzu r12,16(r4) C load s1 limb
subfe r31,r7,r0 C add limbs with cy, set cy
stwu r30,16(r3) C store result limb
lwzu r6,16(r5) C load s2 limb
bdnz L(loop) C decrement CTR and loop back
L(enda):
subfe r30,r9,r8 C add limbs with cy, set cy
stw r31,4(r3) C store result limb
subfe r31,r11,r10 C add limbs with cy, set cy
stw r30,8(r3) C store result limb
subfe r30,r6,r12 C add limbs with cy, set cy
stw r31,12(r3) C store result limb
stw r30,16(r3) C store result limb
L(end):
subfe r3, r0, r0 C 0 or -1
subfic r3, r3, 0 C 0 or 1
lmw r30,-8(r1)
blr
EPILOGUE(mpn_sub_n)
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