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dnl Intel P6 mpn_add_n/mpn_sub_n -- mpn add or subtract.
dnl Copyright 2006 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 TODO:
C * Avoid indexed addressing, it makes us stall on the two-ported register
C file.
C cycles/limb
C P6 model 0-8,10-12 3.17
C P6 model 9 (Banias) 2.15
C P6 model 13 (Dothan) 2.25
define(`rp', `%edi')
define(`up', `%esi')
define(`vp', `%ebx')
define(`n', `%ecx')
ifdef(`OPERATION_add_n', `
define(ADCSBB, adc)
define(func, mpn_add_n)
define(func_nc, mpn_add_nc)')
ifdef(`OPERATION_sub_n', `
define(ADCSBB, sbb)
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()
TEXT
ALIGN(16)
PROLOGUE(func)
xor %edx, %edx
L(start):
push %edi
push %esi
push %ebx
mov 16(%esp), rp
mov 20(%esp), up
mov 24(%esp), vp
mov 28(%esp), n
lea (up,n,4), up
lea (vp,n,4), vp
lea (rp,n,4), rp
neg n
mov n, %eax
and $-8, n
and $7, %eax
shl $2, %eax C 4x
ifdef(`PIC',`
call L(pic_calc)
L(here):
',`
lea L(ent) (%eax,%eax,2), %eax C 12x
')
shr %edx C set cy flag
jmp *%eax
ifdef(`PIC',`
L(pic_calc):
C See mpn/x86/README about old gas bugs
lea (%eax,%eax,2), %eax
add $L(ent)-L(here), %eax
add (%esp), %eax
ret_internal
')
L(end):
sbb %eax, %eax
neg %eax
pop %ebx
pop %esi
pop %edi
ret
ALIGN(16)
L(top):
jecxz L(end)
L(ent):
Zdisp( mov, 0,(up,n,4), %eax)
Zdisp( ADCSBB, 0,(vp,n,4), %eax)
Zdisp( mov, %eax, 0,(rp,n,4))
mov 4(up,n,4), %edx
ADCSBB 4(vp,n,4), %edx
mov %edx, 4(rp,n,4)
mov 8(up,n,4), %eax
ADCSBB 8(vp,n,4), %eax
mov %eax, 8(rp,n,4)
mov 12(up,n,4), %edx
ADCSBB 12(vp,n,4), %edx
mov %edx, 12(rp,n,4)
mov 16(up,n,4), %eax
ADCSBB 16(vp,n,4), %eax
mov %eax, 16(rp,n,4)
mov 20(up,n,4), %edx
ADCSBB 20(vp,n,4), %edx
mov %edx, 20(rp,n,4)
mov 24(up,n,4), %eax
ADCSBB 24(vp,n,4), %eax
mov %eax, 24(rp,n,4)
mov 28(up,n,4), %edx
ADCSBB 28(vp,n,4), %edx
mov %edx, 28(rp,n,4)
lea 8(n), n
jmp L(top)
EPILOGUE()
PROLOGUE(func_nc)
movl 20(%esp), %edx
jmp L(start)
EPILOGUE()
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