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dnl ARM mpn_cnd_add_n, mpn_cnd_sub_n
dnl Copyright 2012, 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 3
C Cortex-A15 2.5
define(`cnd', `r0')
define(`rp', `r1')
define(`up', `r2')
define(`vp', `r3')
define(`n', `r12')
ifdef(`OPERATION_cnd_add_n', `
define(`ADDSUB', adds)
define(`ADDSUBC', adcs)
define(`INITCY', `cmn r0, #0')
define(`RETVAL', `adc r0, n, #0')
define(func, mpn_cnd_add_n)')
ifdef(`OPERATION_cnd_sub_n', `
define(`ADDSUB', subs)
define(`ADDSUBC', sbcs)
define(`INITCY', `cmp r0, #0')
define(`RETVAL', `adc r0, n, #0
rsb r0, r0, #1')
define(func, mpn_cnd_sub_n)')
MULFUNC_PROLOGUE(mpn_cnd_add_n mpn_cnd_sub_n)
ASM_START()
PROLOGUE(func)
push {r4-r11}
ldr n, [sp, #32]
cmp cnd, #1
sbc cnd, cnd, cnd C conditionally set to 0xffffffff
INITCY C really only needed for n = 0 (mod 4)
ands r4, n, #3
beq L(top)
cmp r4, #2
bcc L(b1)
beq L(b2)
L(b3): ldm vp!, {r4,r5,r6}
ldm up!, {r8,r9,r10}
bic r4, r4, cnd
bic r5, r5, cnd
bic r6, r6, cnd
ADDSUB r8, r8, r4
ADDSUBC r9, r9, r5
ADDSUBC r10, r10, r6
stm rp!, {r8,r9,r10}
sub n, n, #3
teq n, #0
bne L(top)
b L(end)
L(b2): ldm vp!, {r4,r5}
ldm up!, {r8,r9}
bic r4, r4, cnd
bic r5, r5, cnd
ADDSUB r8, r8, r4
ADDSUBC r9, r9, r5
stm rp!, {r8,r9}
sub n, n, #2
teq n, #0
bne L(top)
b L(end)
L(b1): ldr r4, [vp], #4
ldr r8, [up], #4
bic r4, r4, cnd
ADDSUB r8, r8, r4
str r8, [rp], #4
sub n, n, #1
teq n, #0
beq L(end)
L(top): ldm vp!, {r4,r5,r6,r7}
ldm up!, {r8,r9,r10,r11}
bic r4, r4, cnd
bic r5, r5, cnd
bic r6, r6, cnd
bic r7, r7, cnd
ADDSUBC r8, r8, r4
ADDSUBC r9, r9, r5
ADDSUBC r10, r10, r6
ADDSUBC r11, r11, r7
sub n, n, #4
stm rp!, {r8,r9,r10,r11}
teq n, #0
bne L(top)
L(end): RETVAL
pop {r4-r11}
bx r14
EPILOGUE()
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