139 lines
2.9 KiB
NASM
139 lines
2.9 KiB
NASM
|
dnl PowerPC-32 mpn_submul_1 -- Multiply a limb vector with a limb and subtract
|
||
|
|
dnl the result from a second limb vector.
|
||
|
|
|
||
|
|
dnl Copyright 1995, 1997, 1998, 2000, 2002, 2005 Free Software Foundation,
|
||
|
|
dnl 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
|
||
|
|
dnl to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
|
||
|
|
dnl Boston, MA 02110-1301, USA.
|
||
|
|
|
||
|
|
include(`../config.m4')
|
||
|
|
|
||
|
|
C cycles/limb
|
||
|
|
C 603e: ?
|
||
|
|
C 604e: 7.5
|
||
|
|
C 75x (G3): 9.3-15
|
||
|
|
C 7400,7410 (G4): 9.3-15
|
||
|
|
C 744x,745x (G4+): 10.5
|
||
|
|
C power4/ppc970: 6.75
|
||
|
|
C power5: 6.5
|
||
|
|
|
||
|
|
C INPUT PARAMETERS
|
||
|
|
C rp r3
|
||
|
|
C up r4
|
||
|
|
C n r5
|
||
|
|
C vl r6
|
||
|
|
|
||
|
|
C This is optimized for the PPC604. See addmul_1.asm for additional comments.
|
||
|
|
|
||
|
|
ASM_START()
|
||
|
|
PROLOGUE(mpn_submul_1)
|
||
|
|
cmpwi cr0,r5,9 C more than 9 limbs?
|
||
|
|
bgt cr0,L(big) C branch if more than 9 limbs
|
||
|
|
|
||
|
|
mtctr r5
|
||
|
|
lwz r0,0(r4)
|
||
|
|
mullw r7,r0,r6
|
||
|
|
mulhwu r10,r0,r6
|
||
|
|
lwz r9,0(r3)
|
||
|
|
subfc r8,r7,r9
|
||
|
|
addc r7,r7,r8 C invert cy (r7 is junk)
|
||
|
|
addi r3,r3,-4
|
||
|
|
bdz L(end)
|
||
|
|
L(loop):
|
||
|
|
lwzu r0,4(r4)
|
||
|
|
stwu r8,4(r3)
|
||
|
|
mullw r8,r0,r6
|
||
|
|
adde r7,r8,r10
|
||
|
|
mulhwu r10,r0,r6
|
||
|
|
lwz r9,4(r3)
|
||
|
|
addze r10,r10
|
||
|
|
subfc r8,r7,r9
|
||
|
|
addc r7,r7,r8 C invert cy (r7 is junk)
|
||
|
|
bdnz L(loop)
|
||
|
|
L(end): stw r8,4(r3)
|
||
|
|
addze r3,r10
|
||
|
|
blr
|
||
|
|
|
||
|
|
L(big): stmw r30,-32(r1)
|
||
|
|
addi r5,r5,-1
|
||
|
|
srwi r0,r5,2
|
||
|
|
mtctr r0
|
||
|
|
|
||
|
|
lwz r7,0(r4)
|
||
|
|
mullw r8,r7,r6
|
||
|
|
mulhwu r0,r7,r6
|
||
|
|
lwz r7,0(r3)
|
||
|
|
subfc r7,r8,r7
|
||
|
|
addc r8,r8,r7
|
||
|
|
stw r7,0(r3)
|
||
|
|
|
||
|
|
L(loopU):
|
||
|
|
lwz r7,4(r4)
|
||
|
|
lwz r12,8(r4)
|
||
|
|
lwz r30,12(r4)
|
||
|
|
lwzu r31,16(r4)
|
||
|
|
mullw r8,r7,r6
|
||
|
|
mullw r9,r12,r6
|
||
|
|
mullw r10,r30,r6
|
||
|
|
mullw r11,r31,r6
|
||
|
|
adde r8,r8,r0 C add cy_limb
|
||
|
|
mulhwu r0,r7,r6
|
||
|
|
lwz r7,4(r3)
|
||
|
|
adde r9,r9,r0
|
||
|
|
mulhwu r0,r12,r6
|
||
|
|
lwz r12,8(r3)
|
||
|
|
adde r10,r10,r0
|
||
|
|
mulhwu r0,r30,r6
|
||
|
|
lwz r30,12(r3)
|
||
|
|
adde r11,r11,r0
|
||
|
|
mulhwu r0,r31,r6
|
||
|
|
lwz r31,16(r3)
|
||
|
|
addze r0,r0 C new cy_limb
|
||
|
|
subfc r7,r8,r7
|
||
|
|
stw r7,4(r3)
|
||
|
|
subfe r12,r9,r12
|
||
|
|
stw r12,8(r3)
|
||
|
|
subfe r30,r10,r30
|
||
|
|
stw r30,12(r3)
|
||
|
|
subfe r31,r11,r31
|
||
|
|
stwu r31,16(r3)
|
||
|
|
subfe r11,r11,r11 C invert ...
|
||
|
|
addic r11,r11,1 C ... carry
|
||
|
|
bdnz L(loopU)
|
||
|
|
|
||
|
|
andi. r31,r5,3
|
||
|
|
mtctr r31
|
||
|
|
beq cr0,L(endx)
|
||
|
|
|
||
|
|
L(loopE):
|
||
|
|
lwzu r7,4(r4)
|
||
|
|
mullw r8,r7,r6
|
||
|
|
adde r8,r8,r0 C add cy_limb
|
||
|
|
mulhwu r0,r7,r6
|
||
|
|
lwz r7,4(r3)
|
||
|
|
addze r0,r0 C new cy_limb
|
||
|
|
subfc r7,r8,r7
|
||
|
|
addc r8,r8,r7
|
||
|
|
stwu r7,4(r3)
|
||
|
|
bdnz L(loopE)
|
||
|
|
L(endx):
|
||
|
|
addze r3,r0
|
||
|
|
lmw r30,-32(r1)
|
||
|
|
blr
|
||
|
|
EPILOGUE(mpn_submul_1)
|