mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 21:10:07 +00:00
688903eb3e
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
115 lines
2.3 KiB
ArmAsm
115 lines
2.3 KiB
ArmAsm
/* x86-64 __mpn_rshift --
|
|
Copyright (C) 2007-2018 Free Software Foundation, Inc.
|
|
This file is part of the GNU MP Library.
|
|
|
|
The GNU MP Library is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 of the License, or (at your
|
|
option) any later version.
|
|
|
|
The GNU MP Library is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
|
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with the GNU MP Library; see the file COPYING.LIB. If not,
|
|
see <http://www.gnu.org/licenses/>. */
|
|
|
|
#include "sysdep.h"
|
|
#include "asm-syntax.h"
|
|
|
|
#define rp %rdi
|
|
#define up %rsi
|
|
#define n %rdx
|
|
#define cnt %cl
|
|
|
|
.text
|
|
ENTRY (__mpn_rshift)
|
|
mov %edx, %eax
|
|
and $3, %eax
|
|
jne L(nb00)
|
|
L(b00): /* n = 4, 8, 12, ... */
|
|
mov (up), %r10
|
|
mov 8(up), %r11
|
|
xor %eax, %eax
|
|
shrd %cl, %r10, %rax
|
|
mov 16(up), %r8
|
|
lea 8(up), up
|
|
lea -24(rp), rp
|
|
sub $4, n
|
|
jmp L(00)
|
|
|
|
L(nb00):/* n = 1, 5, 9, ... */
|
|
cmp $2, %eax
|
|
jae L(nb01)
|
|
L(b01): mov (up), %r9
|
|
xor %eax, %eax
|
|
shrd %cl, %r9, %rax
|
|
sub $2, n
|
|
jb L(le1)
|
|
mov 8(up), %r10
|
|
mov 16(up), %r11
|
|
lea 16(up), up
|
|
lea -16(rp), rp
|
|
jmp L(01)
|
|
L(le1): shr %cl, %r9
|
|
mov %r9, (rp)
|
|
ret
|
|
|
|
L(nb01):/* n = 2, 6, 10, ... */
|
|
jne L(b11)
|
|
L(b10): mov (up), %r8
|
|
mov 8(up), %r9
|
|
xor %eax, %eax
|
|
shrd %cl, %r8, %rax
|
|
sub $3, n
|
|
jb L(le2)
|
|
mov 16(up), %r10
|
|
lea 24(up), up
|
|
lea -8(rp), rp
|
|
jmp L(10)
|
|
L(le2): shrd %cl, %r9, %r8
|
|
mov %r8, (rp)
|
|
shr %cl, %r9
|
|
mov %r9, 8(rp)
|
|
ret
|
|
|
|
.p2align 4
|
|
L(b11): /* n = 3, 7, 11, ... */
|
|
mov (up), %r11
|
|
mov 8(up), %r8
|
|
xor %eax, %eax
|
|
shrd %cl, %r11, %rax
|
|
mov 16(up), %r9
|
|
lea 32(up), up
|
|
sub $4, n
|
|
jb L(end)
|
|
|
|
.p2align 4
|
|
L(top): shrd %cl, %r8, %r11
|
|
mov -8(up), %r10
|
|
mov %r11, (rp)
|
|
L(10): shrd %cl, %r9, %r8
|
|
mov (up), %r11
|
|
mov %r8, 8(rp)
|
|
L(01): shrd %cl, %r10, %r9
|
|
mov 8(up), %r8
|
|
mov %r9, 16(rp)
|
|
L(00): shrd %cl, %r11, %r10
|
|
mov 16(up), %r9
|
|
mov %r10, 24(rp)
|
|
add $32, up
|
|
lea 32(rp), rp
|
|
sub $4, n
|
|
jnc L(top)
|
|
|
|
L(end): shrd %cl, %r8, %r11
|
|
mov %r11, (rp)
|
|
shrd %cl, %r9, %r8
|
|
mov %r8, 8(rp)
|
|
shr %cl, %r9
|
|
mov %r9, 16(rp)
|
|
ret
|
|
END (__mpn_rshift)
|