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dnl ARM mpn_rsh1add_n and mpn_rsh1sub_n.
dnl Contributed to the GNU project by Torbjörn Granlund.
dnl Copyright 2012 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 3.64-3.7
C Cortex-A15 2.5
C TODO
C * Not optimised.
define(`rp', `r0')
define(`up', `r1')
define(`vp', `r2')
define(`n', `r3')
ifdef(`OPERATION_rsh1add_n', `
define(`ADDSUB', adds)
define(`ADDSUBC', adcs)
define(`RSTCY', `cmn $1, $1')
define(`func', mpn_rsh1add_n)
define(`func_nc', mpn_rsh1add_nc)')
ifdef(`OPERATION_rsh1sub_n', `
define(`ADDSUB', subs)
define(`ADDSUBC', sbcs)
define(`RSTCY',
`mvn $2, #0x80000000
cmp $2, $1')
define(`func', mpn_rsh1sub_n)
define(`func_nc', mpn_rsh1sub_nc)')
MULFUNC_PROLOGUE(mpn_rsh1add_n mpn_rsh1sub_n)
ASM_START()
PROLOGUE(func)
push {r4-r11}
ldr r4, [up], #4
ldr r8, [vp], #4
ADDSUB r4, r4, r8
movs r12, r7, rrx
and r11, r4, #1 C return value
subs n, n, #4
blo L(end)
L(top): ldmia up!, {r5,r6,r7}
ldmia vp!, {r8,r9,r10}
cmn r12, r12
ADDSUBC r5, r5, r8
ADDSUBC r6, r6, r9
ADDSUBC r7, r7, r10
movs r12, r7, rrx
movs r6, r6, rrx
movs r5, r5, rrx
movs r4, r4, rrx
subs n, n, #3
stmia rp!, {r4,r5,r6}
mov r4, r7
bhs L(top)
L(end): cmn n, #2
bls L(e2)
ldm up, {r5,r6}
ldm vp, {r8,r9}
cmn r12, r12
ADDSUBC r5, r5, r8
ADDSUBC r6, r6, r9
movs r12, r6, rrx
movs r5, r5, rrx
movs r4, r4, rrx
stmia rp!, {r4,r5}
mov r4, r6
b L(e1)
L(e2): bne L(e1)
ldr r5, [up, #0]
ldr r8, [vp, #0]
cmn r12, r12
ADDSUBC r5, r5, r8
movs r12, r5, rrx
movs r4, r4, rrx
str r4, [rp], #4
mov r4, r5
L(e1): RSTCY( r12, r1)
mov r4, r4, rrx
str r4, [rp, #0]
mov r0, r11
pop {r4-r11}
return r14
EPILOGUE()
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