87 lines
2.0 KiB
NASM
87 lines
2.0 KiB
NASM
dnl X86_64 mpn_divrem_hensel_r_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 hensel divide (rdi,rsi) / rdx
|
|
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_r_1)
|
|
mov $0,%r9
|
|
sub %rsi,%r9
|
|
lea (%rdi,%rsi,8),%rdi
|
|
|
|
mov %rdx,%rcx
|
|
|
|
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 (%rdi,%r9,8),%rax
|
|
sbb %rdx,%rax
|
|
sbb %r8,%r8
|
|
imul %r11,%rax
|
|
mul %rcx
|
|
add $1,%r8
|
|
inc %r9
|
|
jnz loop
|
|
mov $0,%rax
|
|
adc %rdx,%rax
|
|
ret
|
|
EPILOGUE()
|