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dnl x86 mpn_bdiv_dbm1.
dnl Copyright 2008, 2011 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) 5.1
C P4 model 0 (Willamette)
C P4 model 1 (?)
C P4 model 2 (Northwood) 13.67
C P4 model 3 (Prescott)
C P4 model 4 (Nocona)
C Intel Atom
C AMD K6
C AMD K7 3.5
C AMD K8
C AMD K10
C TODO
C * Optimize for more x86 processors
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(mpn_bdiv_dbm1c)
mov 16(%esp), %ecx C d
push %esi
mov 12(%esp), %esi C ap
push %edi
mov 12(%esp), %edi C qp
push %ebp
mov 24(%esp), %ebp C n
push %ebx
mov (%esi), %eax
mul %ecx
mov 36(%esp), %ebx
sub %eax, %ebx
mov %ebx, (%edi)
sbb %edx, %ebx
mov %ebp, %eax
and $3, %eax
jz L(b0)
cmp $2, %eax
jc L(b1)
jz L(b2)
L(b3): lea -8(%esi), %esi
lea 8(%edi), %edi
add $-3, %ebp
jmp L(3)
L(b0): mov 4(%esi), %eax
lea -4(%esi), %esi
lea 12(%edi), %edi
add $-4, %ebp
jmp L(0)
L(b2): mov 4(%esi), %eax
lea 4(%esi), %esi
lea 4(%edi), %edi
add $-2, %ebp
jmp L(2)
ALIGN(8)
L(top): mov 4(%esi), %eax
mul %ecx
lea 16(%edi), %edi
sub %eax, %ebx
mov 8(%esi), %eax
mov %ebx, -12(%edi)
sbb %edx, %ebx
L(0): mul %ecx
sub %eax, %ebx
mov %ebx, -8(%edi)
sbb %edx, %ebx
L(3): mov 12(%esi), %eax
mul %ecx
sub %eax, %ebx
mov %ebx, -4(%edi)
mov 16(%esi), %eax
lea 16(%esi), %esi
sbb %edx, %ebx
L(2): mul %ecx
sub %eax, %ebx
mov %ebx, 0(%edi)
sbb %edx, %ebx
L(b1): add $-4, %ebp
jns L(top)
mov %ebx, %eax
pop %ebx
pop %ebp
pop %edi
pop %esi
ret
EPILOGUE()
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