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dnl x86_64 mpn_bdiv_dbm1.
dnl Copyright 2008, 2011, 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 AMD K8,K9 2.25
C AMD K10 2.25
C Intel P4 12.5
C Intel core2 4
C Intel NHM 3.75
C Intel SBR 3.6
C Intel atom 20
C VIA nano 4
C TODO
C * Optimise feed-in code.
C INPUT PARAMETERS
define(`qp', `%rdi')
define(`up', `%rsi')
define(`n_param', `%rdx')
define(`bd', `%rcx')
define(`cy', `%r8')
define(`n', `%r9')
ABI_SUPPORT(DOS64)
ABI_SUPPORT(STD64)
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(mpn_bdiv_dbm1c)
FUNC_ENTRY(4)
IFDOS(` mov 56(%rsp), %r8 ')
mov (up), %rax
mov n_param, n
mov R32(n_param), R32(%r11)
mul bd
lea (up,n,8), up
lea (qp,n,8), qp
neg n
and $3, R32(%r11)
jz L(lo0)
lea -4(n,%r11), n
cmp $2, R32(%r11)
jc L(lo1)
jz L(lo2)
jmp L(lo3)
ALIGN(16)
L(top): mov (up,n,8), %rax
mul bd
L(lo0): sub %rax, %r8
mov %r8, (qp,n,8)
sbb %rdx, %r8
mov 8(up,n,8), %rax
mul bd
L(lo3): sub %rax, %r8
mov %r8, 8(qp,n,8)
sbb %rdx, %r8
mov 16(up,n,8), %rax
mul bd
L(lo2): sub %rax, %r8
mov %r8, 16(qp,n,8)
sbb %rdx, %r8
mov 24(up,n,8), %rax
mul bd
L(lo1): sub %rax, %r8
mov %r8, 24(qp,n,8)
sbb %rdx, %r8
add $4, n
jnz L(top)
mov %r8, %rax
FUNC_EXIT()
ret
EPILOGUE()
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