mpir/mpn/x86_64/core2/lshift.asm

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dnl mpn_lshift
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 mpn_lshift(mp_ptr rdi,mp_ptr rsi,mp_size_t rdx,mp_limb_t rcx)
C rax=carry
ASM_START()
PROLOGUE(mpn_lshift)
# odd and even n seem to have different runtimes
push %rbx
mov %rdx,%rbx
lea 24(%rsi),%rsi
lea 24(%rdi),%rdi
mov -32(%rsi,%rbx,8),%rdx
xor %rax,%rax
shld %cl,%rdx,%rax
sub $5,%rbx
js skiplp
ALIGN(16)
lp:
mov (%rsi,%rbx,8),%r8
mov -24(%rsi,%rbx,8),%r11
mov -8(%rsi,%rbx,8),%r9
shld %cl,%r8,%rdx
mov %rdx,8(%rdi,%rbx,8)
mov %r11,%rdx
mov -16(%rsi,%rbx,8),%r10
shld %cl,%r9,%r8
shld %cl,%r10,%r9
mov %r8,(%rdi,%rbx,8)
mov %r9,-8(%rdi,%rbx,8)
shld %cl,%r11,%r10
sub $4,%rbx
mov %r10,16(%rdi,%rbx,8)
jns lp
skiplp:
cmp $-2,%rbx
ja case3
je case2
jp case1
#ALIGN(16)
case0:
shl %cl,%rdx
mov %rdx,8(%rdi,%rbx,8)
pop %rbx
ret
ALIGN(16)
case3:
mov (%rsi,%rbx,8),%r8
mov -8(%rsi,%rbx,8),%r9
shld %cl,%r8,%rdx
mov %rdx,8(%rdi,%rbx,8)
mov -16(%rsi,%rbx,8),%r10
shld %cl,%r9,%r8
shld %cl,%r10,%r9
mov %r8,(%rdi,%rbx,8)
mov %r9,-8(%rdi,%rbx,8)
shl %cl,%r10
mov %r10,16-32(%rdi,%rbx,8)
pop %rbx
ret
ALIGN(16)
case2:
mov (%rsi,%rbx,8),%r8
mov -8(%rsi,%rbx,8),%r9
shld %cl,%r8,%rdx
mov %rdx,8(%rdi,%rbx,8)
shld %cl,%r9,%r8
shl %cl,%r9
mov %r8,(%rdi,%rbx,8)
mov %r9,-8(%rdi,%rbx,8)
pop %rbx
ret
ALIGN(16)
case1:
mov (%rsi,%rbx,8),%r8
shld %cl,%r8,%rdx
mov %rdx,8(%rdi,%rbx,8)
shl %cl,%r8
mov %r8,(%rdi,%rbx,8)
pop %rbx
ret
EPILOGUE()