mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-03 10:21:05 +00:00
114 lines
3.0 KiB
ArmAsm
114 lines
3.0 KiB
ArmAsm
/* i80386 __mpn_sub_n -- Add two limb vectors of the same length > 0 and store
|
|
sum in a third limb vector.
|
|
Copyright (C) 1992-2013 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"
|
|
#include "bp-sym.h"
|
|
#include "bp-asm.h"
|
|
|
|
#define PARMS LINKAGE+8 /* space for 2 saved regs */
|
|
#define RES PARMS
|
|
#define S1 RES+PTR_SIZE
|
|
#define S2 S1+PTR_SIZE
|
|
#define SIZE S2+PTR_SIZE
|
|
|
|
.text
|
|
ENTRY (BP_SYM (__mpn_sub_n))
|
|
|
|
pushl %edi
|
|
cfi_adjust_cfa_offset (4)
|
|
pushl %esi
|
|
cfi_adjust_cfa_offset (4)
|
|
|
|
movl RES(%esp),%edi
|
|
cfi_rel_offset (edi, 4)
|
|
movl S1(%esp),%esi
|
|
cfi_rel_offset (esi, 0)
|
|
movl S2(%esp),%edx
|
|
movl SIZE(%esp),%ecx
|
|
movl %ecx,%eax
|
|
shrl $3,%ecx /* compute count for unrolled loop */
|
|
negl %eax
|
|
andl $7,%eax /* get index where to start loop */
|
|
jz L(oop) /* necessary special case for 0 */
|
|
incl %ecx /* adjust loop count */
|
|
shll $2,%eax /* adjustment for pointers... */
|
|
subl %eax,%edi /* ... since they are offset ... */
|
|
subl %eax,%esi /* ... by a constant when we ... */
|
|
subl %eax,%edx /* ... enter the loop */
|
|
shrl $2,%eax /* restore previous value */
|
|
#ifdef PIC
|
|
/* Calculate start address in loop for PIC. Due to limitations in some
|
|
assemblers, Loop-L0-3 cannot be put into the leal */
|
|
call L(0)
|
|
cfi_adjust_cfa_offset (4)
|
|
L(0): leal (%eax,%eax,8),%eax
|
|
addl (%esp),%eax
|
|
addl $(L(oop)-L(0)-3),%eax
|
|
addl $4,%esp
|
|
cfi_adjust_cfa_offset (-4)
|
|
#else
|
|
/* Calculate start address in loop for non-PIC. */
|
|
leal (L(oop) - 3)(%eax,%eax,8),%eax
|
|
#endif
|
|
jmp *%eax /* jump into loop */
|
|
ALIGN (3)
|
|
L(oop): movl (%esi),%eax
|
|
sbbl (%edx),%eax
|
|
movl %eax,(%edi)
|
|
movl 4(%esi),%eax
|
|
sbbl 4(%edx),%eax
|
|
movl %eax,4(%edi)
|
|
movl 8(%esi),%eax
|
|
sbbl 8(%edx),%eax
|
|
movl %eax,8(%edi)
|
|
movl 12(%esi),%eax
|
|
sbbl 12(%edx),%eax
|
|
movl %eax,12(%edi)
|
|
movl 16(%esi),%eax
|
|
sbbl 16(%edx),%eax
|
|
movl %eax,16(%edi)
|
|
movl 20(%esi),%eax
|
|
sbbl 20(%edx),%eax
|
|
movl %eax,20(%edi)
|
|
movl 24(%esi),%eax
|
|
sbbl 24(%edx),%eax
|
|
movl %eax,24(%edi)
|
|
movl 28(%esi),%eax
|
|
sbbl 28(%edx),%eax
|
|
movl %eax,28(%edi)
|
|
leal 32(%edi),%edi
|
|
leal 32(%esi),%esi
|
|
leal 32(%edx),%edx
|
|
decl %ecx
|
|
jnz L(oop)
|
|
|
|
sbbl %eax,%eax
|
|
negl %eax
|
|
|
|
popl %esi
|
|
cfi_adjust_cfa_offset (-4)
|
|
cfi_restore (esi)
|
|
popl %edi
|
|
cfi_adjust_cfa_offset (-4)
|
|
cfi_restore (edi)
|
|
|
|
ret
|
|
END (BP_SYM (__mpn_sub_n))
|