File: [local] / OpenXM_contrib / gmp / mpn / arm / Attic / submul_1.asm (download)
Revision 1.1.1.1 (vendor branch), Mon Aug 25 16:06:18 2003 UTC (21 years ago) by ohara
Branch: GMP
CVS Tags: VERSION_4_1_2, RELEASE_1_2_3, RELEASE_1_2_2_KNOPPIX_b, RELEASE_1_2_2_KNOPPIX Changes since 1.1: +0 -0
lines
Import gmp 4.1.2
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dnl ARM mpn_submul_1 -- Multiply a limb vector with a limb and subtract the
dnl result from a second limb vector.
dnl Based on mpn_addmul_1, which was contributed by Robert Harley.
dnl Copyright 1998, 2000, 2001 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 This runs at 9.75 cycles/limb in the StrongARM.
C Could use some register cleanup. Some fewer registers might be needed, or
C r11 could be utilized for better speed. Could avoid saving all registers for
C small (n <= 3) operands.
define(`rp',`r0')
define(`up',`r1')
define(`n',`r2')
define(`v',`r3')
ASM_START()
PROLOGUE(mpn_submul_1)
stmfd sp!, { r4-r10, lr }
mov r4, #0
movs n, n, lsr #1
bcc L(skip1)
ldr lr, [up], #4
umull r4, r12, v, lr
ldr r6, [rp]
subs r6, r6, r4
sbc r4, r0, r0
sub r4, r12, r4
str r6, [rp], #4
L(skip1):
movs n, n, lsr #1
bcc L(skip2)
ldmia up!, { r9, r10 }
mov r5, #0
umlal r4, r5, v, r9
mov r9, #0
umlal r5, r9, v, r10
ldmia rp, { r6, r7 }
subs r6, r6, r4
sbcs r7, r7, r5
sbc r4, r0, r0
sub r4, r9, r4
stmia rp!, { r6, r7 }
L(skip2):
teq n, #0
beq L(return)
L(submul_loop):
ldmia up!, { r9, r10, r12, lr }
mov r5, #0
umlal r4, r5, v, r9
mov r9, #0
umlal r5, r9, v, r10
mov r10, #0
umlal r9, r10, v, r12
mov r12, #0
umlal r10, r12, v, lr
ldmia rp, { r6, r7, r8, lr }
subs r6, r6, r4
sbcs r7, r7, r5
sbcs r8, r8, r9
sbcs lr, lr, r10
sbc r4, r0, r0
sub r4, r12, r4
subs n, n, #1
stmia rp!, { r6, r7, r8, lr }
bne L(submul_loop)
L(return):
mov r0, r4
ldmfd sp!, { r4-r10, pc }
EPILOGUE(mpn_submul_1)