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95 lines
2.4 KiB
ArmAsm
95 lines
2.4 KiB
ArmAsm
/* i80386 __mpn_sub_n -- Add two limb vectors of the same length > 0 and store
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sum in a third limb vector.
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Copyright (C) 1992, 1994 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Library General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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License for more details.
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You should have received a copy of the GNU Library General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/*
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INPUT PARAMETERS
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res_ptr (sp + 4)
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s1_ptr (sp + 8)
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s2_ptr (sp + 12)
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size (sp + 16)
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*/
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#include "sysdep.h"
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#include "asm-syntax.h"
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.text
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ALIGN (3)
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.globl C_SYMBOL_NAME(__mpn_sub_n)
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C_SYMBOL_NAME(__mpn_sub_n:)
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pushl %edi
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pushl %esi
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movl 12(%esp),%edi /* res_ptr */
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movl 16(%esp),%esi /* s1_ptr */
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movl 20(%esp),%edx /* s2_ptr */
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movl 24(%esp),%ecx /* size */
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movl %ecx,%eax
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shrl $3,%ecx /* compute count for unrolled loop */
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negl %eax
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andl $7,%eax /* get index where to start loop */
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jz Loop /* necessary special case for 0 */
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incl %ecx /* adjust loop count */
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shll $2,%eax /* adjustment for pointers... */
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subl %eax,%edi /* ... since they are offset ... */
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subl %eax,%esi /* ... by a constant when we ... */
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subl %eax,%edx /* ... enter the loop */
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shrl $2,%eax /* restore previous value */
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leal (Loop - 3)(%eax,%eax,8),%eax /* calc start addr in loop */
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jmp *%eax /* jump into loop */
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ALIGN (3)
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Loop: movl (%esi),%eax
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sbbl (%edx),%eax
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movl %eax,(%edi)
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movl 4(%esi),%eax
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sbbl 4(%edx),%eax
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movl %eax,4(%edi)
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movl 8(%esi),%eax
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sbbl 8(%edx),%eax
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movl %eax,8(%edi)
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movl 12(%esi),%eax
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sbbl 12(%edx),%eax
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movl %eax,12(%edi)
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movl 16(%esi),%eax
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sbbl 16(%edx),%eax
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movl %eax,16(%edi)
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movl 20(%esi),%eax
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sbbl 20(%edx),%eax
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movl %eax,20(%edi)
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movl 24(%esi),%eax
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sbbl 24(%edx),%eax
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movl %eax,24(%edi)
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movl 28(%esi),%eax
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sbbl 28(%edx),%eax
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movl %eax,28(%edi)
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leal 32(%edi),%edi
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leal 32(%esi),%esi
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leal 32(%edx),%edx
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decl %ecx
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jnz Loop
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sbbl %eax,%eax
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negl %eax
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popl %esi
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popl %edi
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ret
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