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dnl X86 mpn_cnd_add_n, mpn_cnd_sub_n
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) 5.4
C P4 model 0-1 (Willamette) ?
C P4 model 2 (Northwood) 14.5
C P4 model 3-4 (Prescott) 21
C Intel atom 11
C AMD K6 ?
C AMD K7 3.4
C AMD K8 ?
define(`rp', `%edi')
define(`up', `%esi')
define(`vp', `%ebp')
define(`n', `%ecx')
define(`cnd', `20(%esp)')
define(`cy', `%edx')
ifdef(`OPERATION_cnd_add_n', `
define(ADDSUB, add)
define(ADCSBB, adc)
define(func, mpn_cnd_add_n)')
ifdef(`OPERATION_cnd_sub_n', `
define(ADDSUB, sub)
define(ADCSBB, sbb)
define(func, mpn_cnd_sub_n)')
MULFUNC_PROLOGUE(mpn_cnd_add_n mpn_cnd_sub_n)
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(func)
add $-16, %esp
mov %ebp, (%esp)
mov %ebx, 4(%esp)
mov %esi, 8(%esp)
mov %edi, 12(%esp)
C make cnd into a full mask
mov cnd, %eax
neg %eax
sbb %eax, %eax
mov %eax, cnd
C load parameters into registers
mov 24(%esp), rp
mov 28(%esp), up
mov 32(%esp), vp
mov 36(%esp), n
mov (vp), %eax
mov (up), %ebx
C put operand pointers just beyond their last limb
lea (vp,n,4), vp
lea (up,n,4), up
lea -4(rp,n,4), rp
neg n
and cnd, %eax
ADDSUB %eax, %ebx
sbb cy, cy
inc n
je L(end)
ALIGN(16)
L(top): mov (vp,n,4), %eax
and cnd, %eax
mov %ebx, (rp,n,4)
mov (up,n,4), %ebx
add cy, cy
ADCSBB %eax, %ebx
sbb cy, cy
inc n
jne L(top)
L(end): mov %ebx, (rp)
xor %eax, %eax
sub cy, %eax
mov (%esp), %ebp
mov 4(%esp), %ebx
mov 8(%esp), %esi
mov 12(%esp), %edi
add $16, %esp
ret
EPILOGUE()
ASM_END()
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