glibc/sysdeps/i386/add_n.S
Roland McGrath e215c4786c * Makefile (distribute): Add ChangeLog.[0-9].
* configure.in: Add check for .set directive.
	* config.h.in: Add #undef HAVE_ASM_SET_DIRECTIVE.

	* Makerules [! subdir] (O%-lib): Don't prepend ../.

	* sysdeps/generic/expm1.c: #undef expm1 before weak_alias.


See ChangeLog.4 for earlier changes.
1995-04-14 03:52:54 +00:00

102 lines
2.5 KiB
ArmAsm

/* i80386 __mpn_add_n -- Add two limb vectors of the same length > 0 and store
sum in a third limb vector.
Copyright (C) 1992, 1994 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 Library General Public License as published by
the Free Software Foundation; either version 2 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 Library General Public
License for more details.
You should have received a copy of the GNU Library General Public License
along with the GNU MP Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
/*
INPUT PARAMETERS
res_ptr (sp + 4)
s1_ptr (sp + 8)
s2_ptr (sp + 12)
size (sp + 16)
*/
#include "sysdep.h"
#include "asm-syntax.h"
.text
ALIGN (3)
.globl C_SYMBOL_NAME(__mpn_add_n)
C_SYMBOL_NAME(__mpn_add_n:)
pushl %edi
pushl %esi
movl 12(%esp),%edi /* res_ptr */
movl 16(%esp),%esi /* s1_ptr */
movl 20(%esp),%edx /* s2_ptr */
movl 24(%esp),%ecx /* size */
movl %ecx,%eax
shrl $3,%ecx /* compute count for unrolled loop */
negl %eax
andl $7,%eax /* get index where to start loop */
jz Loop /* 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
call here
here: leal (Loop - 3 - here)(%eax,%eax,8),%eax
addl %eax,(%esp)
ret
#else
leal (Loop - 3)(%eax,%eax,8),%eax /* calc start addr in loop */
jmp *%eax /* jump into loop */
#endif
ALIGN (3)
Loop: movl (%esi),%eax
adcl (%edx),%eax
movl %eax,(%edi)
movl 4(%esi),%eax
adcl 4(%edx),%eax
movl %eax,4(%edi)
movl 8(%esi),%eax
adcl 8(%edx),%eax
movl %eax,8(%edi)
movl 12(%esi),%eax
adcl 12(%edx),%eax
movl %eax,12(%edi)
movl 16(%esi),%eax
adcl 16(%edx),%eax
movl %eax,16(%edi)
movl 20(%esi),%eax
adcl 20(%edx),%eax
movl %eax,20(%edi)
movl 24(%esi),%eax
adcl 24(%edx),%eax
movl %eax,24(%edi)
movl 28(%esi),%eax
adcl 28(%edx),%eax
movl %eax,28(%edi)
leal 32(%edi),%edi
leal 32(%esi),%esi
leal 32(%edx),%edx
decl %ecx
jnz Loop
sbbl %eax,%eax
negl %eax
popl %esi
popl %edi
ret