mpir/mpn/x86_64/amd64/addsub_n.asm

91 lines
1.9 KiB
NASM

dnl AMD64 mpn_addsub_n
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 INPUT PARAMETERS
C rp rdi
C xp rsi
C yp rdx
C zp rcx
C n r8
C (rdi,r8)=(rsi,r8)+(rdx,r8)-(rcx,r8)
C return carry-borrow
ASM_START()
PROLOGUE(mpn_addsub_n)
lea (%rsi,%r8,8),%rsi
lea (%rdx,%r8,8),%rdx
lea (%rdi,%r8,8),%rdi
lea (%rcx,%r8,8),%rcx
neg %r8
xor %rax,%rax
xor %r10,%r10
test $3,%r8
jz next
lp1:
mov (%rdx,%r8,8),%r9
add $1,%rax
sbb (%rcx,%r8,8),%r9
sbb %rax,%rax
add $1,%r10
adc (%rsi,%r8,8),%r9
sbb %r10,%r10
mov %r9,(%rdi,%r8,8)
inc %r8
test $3,%r8
jnz lp1
next:
cmp $0,%r8
jz end
push %rbx
push %rbp
ALIGN(16)
lp:
add $1,%rax
mov (%rdx,%r8,8),%r9
mov 8(%rdx,%r8,8),%rbx
mov 16(%rdx,%r8,8),%rbp
mov 24(%rdx,%r8,8),%r11
sbb (%rcx,%r8,8),%r9
sbb 8(%rcx,%r8,8),%rbx
sbb 16(%rcx,%r8,8),%rbp
sbb 24(%rcx,%r8,8),%r11
sbb %rax,%rax
add $1,%r10
adc (%rsi,%r8,8),%r9
adc 8(%rsi,%r8,8),%rbx
adc 16(%rsi,%r8,8),%rbp
adc 24(%rsi,%r8,8),%r11
mov %r9,(%rdi,%r8,8)
mov %rbx,8(%rdi,%r8,8)
mov %rbp,16(%rdi,%r8,8)
mov %r11,24(%rdi,%r8,8)
sbb %r10,%r10
add $4,%r8
jnz lp
pop %rbp
pop %rbx
end:
sub %r10,%rax
ret
EPILOGUE()