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dnl X86 mpn_cnd_add_n optimised for Intel Atom.
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 P5 ?
C P6 model 0-8,10-12 ?
C P6 model 9 (Banias) ?
C P6 model 13 (Dothan) ?
C P4 model 0-1 (Willamette) ?
C P4 model 2 (Northwood) ?
C P4 model 3-4 (Prescott) ?
C Intel atom 4.67
C AMD K6 ?
C AMD K7 ?
C AMD K8 ?
define(`rp', `%edi')
define(`up', `%esi')
define(`vp', `%ebp')
define(`n', `%ecx')
define(`cnd', `20(%esp)')
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(mpn_cnd_add_n)
push %edi
push %esi
push %ebx
push %ebp
mov cnd, %eax C make cnd into a mask (1)
mov 24(%esp), rp
neg %eax C make cnd into a mask (1)
mov 28(%esp), up
sbb %eax, %eax C make cnd into a mask (1)
mov 32(%esp), vp
mov %eax, cnd C make cnd into a mask (1)
mov 36(%esp), n
xor %edx, %edx
shr $1, n
jnc L(top)
mov 0(vp), %eax
and cnd, %eax
lea 4(vp), vp
add 0(up), %eax
lea 4(rp), rp
lea 4(up), up
sbb %edx, %edx
mov %eax, -4(rp)
inc n
dec n
je L(end)
L(top): sbb %edx, %edx
mov 0(vp), %eax
and cnd, %eax
lea 8(vp), vp
lea 8(rp), rp
mov -4(vp), %ebx
and cnd, %ebx
add %edx, %edx
adc 0(up), %eax
lea 8(up), up
mov %eax, -8(rp)
adc -4(up), %ebx
dec n
mov %ebx, -4(rp)
jne L(top)
L(end): mov $0, %eax
adc %eax, %eax
pop %ebp
pop %ebx
pop %esi
pop %edi
ret
EPILOGUE()
ASM_END()
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