mpir/mpn/x86_64/k8/divrem_hensel_qr_1_1.asm
2009-10-15 18:13:19 +00:00

89 lines
2.0 KiB
NASM

dnl X86_64 mpn_divrem_hensel_qr_1_1
dnl Copyright 2009 Jason Moxham
dnl This file is part of the MPIR Library.
dnl The MPIR Library is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU Lesser General Public License as published
dnl by the Free Software Foundation; either version 2.1 of the License, or (at
dnl your option) any later version.
dnl The MPIR 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 Lesser General Public
dnl License for more details.
dnl You should have received a copy of the GNU Lesser General Public License
dnl along with the MPIR Library; see the file COPYING.LIB. If not, write
dnl to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
dnl Boston, MA 02110-1301, USA.
include(`../config.m4')
C (rdi,rdx)=(rsi,rdx) / rcx
C rax=hensel remainder from div
C This is divrem_hensel_1 with shifting on the output of the quotient
C On k8/k10 the shifting comes for free so no need to have different
C fn for that. And on K8/K10 this runs at 10c/l which is optimal
C This function "replaces" divexact_1 and modexact_1_odd
C This is same as the shifting version but with no shifting
ASM_START()
PROLOGUE(mpn_divrem_hensel_qr_1_1)
mov $0,%r9
sub %rdx,%r9
lea (%rdi,%rdx,8),%rdi
lea (%rsi,%rdx,8),%rsi
mov %rcx,%rdx
mov %rdx,%rax
imul %ecx,%edx
mov $2,%r11
sub %rdx,%r11
imul %eax,%r11d
mov %r11,%rax
imul %ecx,%r11d
mov $2,%rdx
sub %r11,%rdx
imul %eax,%edx
mov %rdx,%rax
imul %ecx,%edx
mov $2,%r11
sub %rdx,%r11
imul %eax,%r11d
mov %r11,%rax
imul %ecx,%r11d
mov $2,%rdx
sub %r11,%rdx
imul %eax,%edx
mov %rdx,%rax
imul %rcx,%rdx
mov $2,%r11
sub %rdx,%r11
imul %rax,%r11
C //clear carry
xor %rdx,%rdx
ALIGN(16)
loop:
mov (%rsi,%r9,8),%rax
sbb %rdx,%rax
sbb %r8,%r8
imul %r11,%rax
mov %rax,(%rdi,%r9,8)
mul %rcx
add $1,%r8
inc %r9
jnz loop
mov $0,%rax
adc %rdx,%rax
ret
EPILOGUE()