74 lines
1.9 KiB
NASM
74 lines
1.9 KiB
NASM
|
dnl ARM mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
|
||
|
|
dnl store difference in a third limb vector.
|
||
|
|
dnl Contributed by Robert Harley.
|
||
|
|
|
||
|
|
dnl Copyright 1997, 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
|
||
|
|
dnl to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
|
||
|
|
dnl Boston, MA 02110-1301, USA.
|
||
|
|
|
||
|
|
include(`../config.m4')
|
||
|
|
|
||
|
|
C This code runs at 5 cycles/limb.
|
||
|
|
|
||
|
|
define(`rp',`r0')
|
||
|
|
define(`up',`r1')
|
||
|
|
define(`vp',`r2')
|
||
|
|
define(`n',`r3')
|
||
|
|
|
||
|
|
|
||
|
|
ASM_START()
|
||
|
|
PROLOGUE(mpn_sub_n)
|
||
|
|
stmfd sp!, { r8, r9, lr }
|
||
|
|
subs r12, r12, r12
|
||
|
|
tst n, #1
|
||
|
|
beq L(skip1)
|
||
|
|
ldr r12, [up], #4
|
||
|
|
ldr lr, [vp], #4
|
||
|
|
subs r12, r12, lr
|
||
|
|
str r12, [rp], #4
|
||
|
|
L(skip1):
|
||
|
|
tst n, #2
|
||
|
|
beq L(skip2)
|
||
|
|
ldmia up!, { r8, r9 }
|
||
|
|
ldmia vp!, { r12, lr }
|
||
|
|
sbcs r8, r8, r12
|
||
|
|
sbcs r9, r9, lr
|
||
|
|
stmia rp!, { r8, r9 }
|
||
|
|
L(skip2):
|
||
|
|
bics n, n, #3
|
||
|
|
beq L(return)
|
||
|
|
stmfd sp!, { r4, r5, r6, r7 }
|
||
|
|
L(sub_n_loop):
|
||
|
|
ldmia up!, { r4, r5, r6, r7 }
|
||
|
|
ldmia vp!, { r8, r9, r12, lr }
|
||
|
|
sbcs r4, r4, r8
|
||
|
|
ldr r8, [rp, #12] C cache allocate
|
||
|
|
sbcs r5, r5, r9
|
||
|
|
sbcs r6, r6, r12
|
||
|
|
sbcs r7, r7, lr
|
||
|
|
stmia rp!, { r4, r5, r6, r7 }
|
||
|
|
sub n, n, #4
|
||
|
|
teq n, #0
|
||
|
|
bne L(sub_n_loop)
|
||
|
|
ldmfd sp!, { r4, r5, r6, r7 }
|
||
|
|
L(return):
|
||
|
|
sbc r0, r0, r0
|
||
|
|
and r0, r0, #1
|
||
|
|
ldmfd sp!, { r8, r9, pc }
|
||
|
|
EPILOGUE(mpn_sub_n)
|