mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 23:10:06 +00:00
256 lines
5.1 KiB
ArmAsm
256 lines
5.1 KiB
ArmAsm
/* Pentium optimized __mpn_rshift --
|
|
Copyright (C) 1992-2014 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 PARMS 4+16 /* space for 4 saved regs */
|
|
#define RES PARMS
|
|
#define S RES+4
|
|
#define SIZE S+4
|
|
#define CNT SIZE+4
|
|
|
|
.text
|
|
ENTRY (__mpn_rshift)
|
|
|
|
pushl %edi
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %esi
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %ebp
|
|
cfi_adjust_cfa_offset (4)
|
|
cfi_rel_offset (ebp, 0)
|
|
pushl %ebx
|
|
cfi_adjust_cfa_offset (4)
|
|
|
|
movl RES(%esp),%edi
|
|
cfi_rel_offset (edi, 12)
|
|
movl S(%esp),%esi
|
|
cfi_rel_offset (esi, 8)
|
|
movl SIZE(%esp),%ebx
|
|
cfi_rel_offset (ebx, 0)
|
|
movl CNT(%esp),%ecx
|
|
|
|
/* We can use faster code for shift-by-1 under certain conditions. */
|
|
cmp $1,%ecx
|
|
jne L(normal)
|
|
leal 4(%edi),%eax
|
|
cmpl %esi,%eax
|
|
jnc L(special) /* jump if res_ptr + 1 >= s_ptr */
|
|
leal (%edi,%ebx,4),%eax
|
|
cmpl %eax,%esi
|
|
jnc L(special) /* jump if s_ptr >= res_ptr + size */
|
|
|
|
L(normal):
|
|
movl (%esi),%edx
|
|
addl $4,%esi
|
|
xorl %eax,%eax
|
|
shrdl %cl,%edx,%eax /* compute carry limb */
|
|
pushl %eax /* push carry limb onto stack */
|
|
cfi_adjust_cfa_offset (4)
|
|
|
|
decl %ebx
|
|
pushl %ebx
|
|
cfi_adjust_cfa_offset (4)
|
|
shrl $3,%ebx
|
|
jz L(end)
|
|
|
|
movl (%edi),%eax /* fetch destination cache line */
|
|
|
|
ALIGN (2)
|
|
L(oop): movl 28(%edi),%eax /* fetch destination cache line */
|
|
movl %edx,%ebp
|
|
|
|
movl (%esi),%eax
|
|
movl 4(%esi),%edx
|
|
shrdl %cl,%eax,%ebp
|
|
shrdl %cl,%edx,%eax
|
|
movl %ebp,(%edi)
|
|
movl %eax,4(%edi)
|
|
|
|
movl 8(%esi),%ebp
|
|
movl 12(%esi),%eax
|
|
shrdl %cl,%ebp,%edx
|
|
shrdl %cl,%eax,%ebp
|
|
movl %edx,8(%edi)
|
|
movl %ebp,12(%edi)
|
|
|
|
movl 16(%esi),%edx
|
|
movl 20(%esi),%ebp
|
|
shrdl %cl,%edx,%eax
|
|
shrdl %cl,%ebp,%edx
|
|
movl %eax,16(%edi)
|
|
movl %edx,20(%edi)
|
|
|
|
movl 24(%esi),%eax
|
|
movl 28(%esi),%edx
|
|
shrdl %cl,%eax,%ebp
|
|
shrdl %cl,%edx,%eax
|
|
movl %ebp,24(%edi)
|
|
movl %eax,28(%edi)
|
|
|
|
addl $32,%esi
|
|
addl $32,%edi
|
|
decl %ebx
|
|
jnz L(oop)
|
|
|
|
L(end): popl %ebx
|
|
cfi_adjust_cfa_offset (-4)
|
|
andl $7,%ebx
|
|
jz L(end2)
|
|
L(oop2):
|
|
movl (%esi),%eax
|
|
shrdl %cl,%eax,%edx /* compute result limb */
|
|
movl %edx,(%edi)
|
|
movl %eax,%edx
|
|
addl $4,%esi
|
|
addl $4,%edi
|
|
decl %ebx
|
|
jnz L(oop2)
|
|
|
|
L(end2):
|
|
shrl %cl,%edx /* compute most significant limb */
|
|
movl %edx,(%edi) /* store it */
|
|
|
|
popl %eax /* pop carry limb */
|
|
cfi_adjust_cfa_offset (-4)
|
|
|
|
popl %ebx
|
|
cfi_adjust_cfa_offset (-4)
|
|
cfi_restore (ebx)
|
|
popl %ebp
|
|
cfi_adjust_cfa_offset (-4)
|
|
cfi_restore (ebp)
|
|
popl %esi
|
|
cfi_adjust_cfa_offset (-4)
|
|
cfi_restore (esi)
|
|
popl %edi
|
|
cfi_adjust_cfa_offset (-4)
|
|
cfi_restore (edi)
|
|
|
|
ret
|
|
|
|
/* We loop from least significant end of the arrays, which is only
|
|
permissible if the source and destination don't overlap, since the
|
|
function is documented to work for overlapping source and destination.
|
|
*/
|
|
|
|
cfi_adjust_cfa_offset (16)
|
|
cfi_rel_offset (edi, 12)
|
|
cfi_rel_offset (esi, 8)
|
|
cfi_rel_offset (ebp, 4)
|
|
cfi_rel_offset (ebx, 0)
|
|
L(special):
|
|
leal -4(%edi,%ebx,4),%edi
|
|
leal -4(%esi,%ebx,4),%esi
|
|
|
|
movl (%esi),%edx
|
|
subl $4,%esi
|
|
|
|
decl %ebx
|
|
pushl %ebx
|
|
cfi_adjust_cfa_offset (4)
|
|
shrl $3,%ebx
|
|
|
|
shrl $1,%edx
|
|
incl %ebx
|
|
decl %ebx
|
|
jz L(Lend)
|
|
|
|
movl (%edi),%eax /* fetch destination cache line */
|
|
|
|
ALIGN (2)
|
|
L(Loop):
|
|
movl -28(%edi),%eax /* fetch destination cache line */
|
|
movl %edx,%ebp
|
|
|
|
movl (%esi),%eax
|
|
movl -4(%esi),%edx
|
|
rcrl $1,%eax
|
|
movl %ebp,(%edi)
|
|
rcrl $1,%edx
|
|
movl %eax,-4(%edi)
|
|
|
|
movl -8(%esi),%ebp
|
|
movl -12(%esi),%eax
|
|
rcrl $1,%ebp
|
|
movl %edx,-8(%edi)
|
|
rcrl $1,%eax
|
|
movl %ebp,-12(%edi)
|
|
|
|
movl -16(%esi),%edx
|
|
movl -20(%esi),%ebp
|
|
rcrl $1,%edx
|
|
movl %eax,-16(%edi)
|
|
rcrl $1,%ebp
|
|
movl %edx,-20(%edi)
|
|
|
|
movl -24(%esi),%eax
|
|
movl -28(%esi),%edx
|
|
rcrl $1,%eax
|
|
movl %ebp,-24(%edi)
|
|
rcrl $1,%edx
|
|
movl %eax,-28(%edi)
|
|
|
|
leal -32(%esi),%esi /* use leal not to clobber carry */
|
|
leal -32(%edi),%edi
|
|
decl %ebx
|
|
jnz L(Loop)
|
|
|
|
L(Lend):
|
|
popl %ebx
|
|
cfi_adjust_cfa_offset (-4)
|
|
sbbl %eax,%eax /* save carry in %eax */
|
|
andl $7,%ebx
|
|
jz L(Lend2)
|
|
addl %eax,%eax /* restore carry from eax */
|
|
L(Loop2):
|
|
movl %edx,%ebp
|
|
movl (%esi),%edx
|
|
rcrl $1,%edx
|
|
movl %ebp,(%edi)
|
|
|
|
leal -4(%esi),%esi /* use leal not to clobber carry */
|
|
leal -4(%edi),%edi
|
|
decl %ebx
|
|
jnz L(Loop2)
|
|
|
|
jmp L(L1)
|
|
L(Lend2):
|
|
addl %eax,%eax /* restore carry from eax */
|
|
L(L1): movl %edx,(%edi) /* store last limb */
|
|
|
|
movl $0,%eax
|
|
rcrl $1,%eax
|
|
|
|
popl %ebx
|
|
cfi_adjust_cfa_offset (-4)
|
|
cfi_restore (ebx)
|
|
popl %ebp
|
|
cfi_adjust_cfa_offset (-4)
|
|
cfi_restore (ebp)
|
|
popl %esi
|
|
cfi_adjust_cfa_offset (-4)
|
|
cfi_restore (esi)
|
|
popl %edi
|
|
cfi_adjust_cfa_offset (-4)
|
|
cfi_restore (edi)
|
|
|
|
ret
|
|
END (__mpn_rshift)
|