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dnl ARM mpn_sec_tabselect
dnl Contributed to the GNU project by Torbjörn Granlund.
dnl Copyright 2013 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of either:
dnl
dnl * the GNU Lesser General Public License as published by the Free
dnl Software Foundation; either version 3 of the License, or (at your
dnl option) any later version.
dnl
dnl or
dnl
dnl * the GNU General Public License as published by the Free Software
dnl Foundation; either version 2 of the License, or (at your option) any
dnl later version.
dnl
dnl or both in parallel, as here.
dnl
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 General Public License
dnl for more details.
dnl
dnl You should have received copies of the GNU General Public License and the
dnl GNU Lesser General Public License along with the GNU MP Library. If not,
dnl see https://www.gnu.org/licenses/.
include(`../config.m4')
C cycles/limb
C StrongARM ?
C XScale ?
C Cortex-A7 ?
C Cortex-A8 ?
C Cortex-A9 2.33
C Cortex-A15 2.2
C TODO
C * Consider using special code for small nents, either swapping the inner and
C outer loops, or providing a few completely unrolling the inner loops.
define(`rp', `r0')
define(`tp', `r1')
define(`n', `r2')
define(`nents', `r3')
C which on stack
define(`i', `r11')
define(`j', `r12')
define(`c', `r14')
define(`mask', `r7')
ASM_START()
PROLOGUE(mpn_sec_tabselect)
push {r4-r11, r14}
subs j, n, #3
bmi L(outer_end)
L(outer_top):
ldr c, [sp, #36]
mov i, nents
push {tp}
mov r8, #0
mov r9, #0
mov r10, #0
L(top): subs c, c, #1
ldm tp, {r4,r5,r6}
sbc mask, mask, mask
subs i, i, #1
add tp, tp, n, lsl #2
and r4, r4, mask
and r5, r5, mask
and r6, r6, mask
orr r8, r8, r4
orr r9, r9, r5
orr r10, r10, r6
bge L(top)
stmia rp!, {r8,r9,r10}
pop {tp}
add tp, tp, #12
subs j, j, #3
bpl L(outer_top)
L(outer_end):
cmp j, #-1
bne L(n2)
ldr c, [sp, #36]
mov i, nents
mov r8, #0
mov r9, #0
L(tp2): subs c, c, #1
sbc mask, mask, mask
ldm tp, {r4,r5}
subs i, i, #1
add tp, tp, n, lsl #2
and r4, r4, mask
and r5, r5, mask
orr r8, r8, r4
orr r9, r9, r5
bge L(tp2)
stmia rp, {r8,r9}
pop {r4-r11, r14}
return lr
L(n2): cmp j, #-2
bne L(n1)
ldr c, [sp, #36]
mov i, nents
mov r8, #0
L(tp1): subs c, c, #1
sbc mask, mask, mask
ldr r4, [tp]
subs i, i, #1
add tp, tp, n, lsl #2
and r4, r4, mask
orr r8, r8, r4
bge L(tp1)
str r8, [rp]
L(n1): pop {r4-r11, r14}
return lr
EPILOGUE()
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