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dnl ARM mpn_add_n and mpn_sub_n
dnl Contributed to the GNU project by Robert Harley.
dnl Copyright 1997, 2000, 2001, 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 2.5 slightly fluctuating
C Cortex-A15 2.25
define(`rp', `r0')
define(`up', `r1')
define(`vp', `r2')
define(`n', `r3')
ifdef(`OPERATION_add_n', `
define(`ADDSUB', adds)
define(`ADDSUBC', adcs)
define(`CLRCY', `cmn r0, #0')
define(`SETCY', `cmp $1, #1')
define(`RETVAL', `adc r0, n, #0')
define(`func', mpn_add_n)
define(`func_nc', mpn_add_nc)')
ifdef(`OPERATION_sub_n', `
define(`ADDSUB', subs)
define(`ADDSUBC', sbcs)
define(`CLRCY', `cmp r0, r0')
define(`SETCY', `rsbs $1, $1, #0')
define(`RETVAL', `sbc r0, r0, r0
and r0, r0, #1')
define(`func', mpn_sub_n)
define(`func_nc', mpn_sub_nc)')
MULFUNC_PROLOGUE(mpn_add_n mpn_add_nc mpn_sub_n mpn_sub_nc)
ASM_START()
PROLOGUE(func_nc)
ldr r12, [sp, #0]
stmfd sp!, { r8, r9, lr }
SETCY( r12)
b L(ent)
EPILOGUE()
PROLOGUE(func)
stmfd sp!, { r8, r9, lr }
CLRCY( r12)
L(ent): tst n, #1
beq L(skip1)
ldr r12, [up], #4
ldr lr, [vp], #4
ADDSUBC r12, r12, lr
str r12, [rp], #4
L(skip1):
tst n, #2
beq L(skip2)
ldmia up!, { r8, r9 }
ldmia vp!, { r12, lr }
ADDSUBC r8, r8, r12
ADDSUBC r9, r9, lr
stmia rp!, { r8, r9 }
L(skip2):
bics n, n, #3
beq L(rtn)
stmfd sp!, { r4, r5, r6, r7 }
L(top): ldmia up!, { r4, r5, r6, r7 }
ldmia vp!, { r8, r9, r12, lr }
ADDSUBC r4, r4, r8
sub n, n, #4
ADDSUBC r5, r5, r9
ADDSUBC r6, r6, r12
ADDSUBC r7, r7, lr
stmia rp!, { r4, r5, r6, r7 }
teq n, #0
bne L(top)
ldmfd sp!, { r4, r5, r6, r7 }
L(rtn): RETVAL
ldmfd sp!, { r8, r9, pc }
EPILOGUE()
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