128 lines
2.7 KiB
ArmAsm
128 lines
2.7 KiB
ArmAsm
/* Pentium __mpn_sub_n -- Subtract two limb vectors of the same length > 0
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and store difference in a third limb vector.
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Copyright (C) 1992, 94, 95, 96, 97, 98 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., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, 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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ENTRY(__mpn_sub_n)
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pushl %edi
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pushl %esi
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pushl %ebx
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pushl %ebp
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movl 20(%esp),%edi /* res_ptr */
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movl 24(%esp),%esi /* s1_ptr */
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movl 28(%esp),%ebp /* s2_ptr */
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movl 32(%esp),%ecx /* size */
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movl (%ebp),%ebx
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decl %ecx
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movl %ecx,%edx
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shrl $3,%ecx
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andl $7,%edx
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testl %ecx,%ecx /* zero carry flag */
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jz L(end)
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pushl %edx
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ALIGN (3)
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L(oop): movl 28(%edi),%eax /* fetch destination cache line */
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leal 32(%edi),%edi
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L(1): movl (%esi),%eax
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movl 4(%esi),%edx
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sbbl %ebx,%eax
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movl 4(%ebp),%ebx
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sbbl %ebx,%edx
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movl 8(%ebp),%ebx
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movl %eax,-32(%edi)
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movl %edx,-28(%edi)
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L(2): movl 8(%esi),%eax
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movl 12(%esi),%edx
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sbbl %ebx,%eax
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movl 12(%ebp),%ebx
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sbbl %ebx,%edx
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movl 16(%ebp),%ebx
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movl %eax,-24(%edi)
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movl %edx,-20(%edi)
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L(3): movl 16(%esi),%eax
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movl 20(%esi),%edx
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sbbl %ebx,%eax
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movl 20(%ebp),%ebx
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sbbl %ebx,%edx
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movl 24(%ebp),%ebx
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movl %eax,-16(%edi)
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movl %edx,-12(%edi)
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L(4): movl 24(%esi),%eax
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movl 28(%esi),%edx
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sbbl %ebx,%eax
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movl 28(%ebp),%ebx
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sbbl %ebx,%edx
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movl 32(%ebp),%ebx
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movl %eax,-8(%edi)
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movl %edx,-4(%edi)
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leal 32(%esi),%esi
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leal 32(%ebp),%ebp
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decl %ecx
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jnz L(oop)
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popl %edx
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L(end):
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decl %edx /* test %edx w/o clobbering carry */
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js L(end2)
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incl %edx
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L(oop2):
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leal 4(%edi),%edi
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movl (%esi),%eax
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sbbl %ebx,%eax
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movl 4(%ebp),%ebx
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movl %eax,-4(%edi)
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leal 4(%esi),%esi
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leal 4(%ebp),%ebp
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decl %edx
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jnz L(oop2)
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L(end2):
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movl (%esi),%eax
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sbbl %ebx,%eax
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movl %eax,(%edi)
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sbbl %eax,%eax
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negl %eax
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popl %ebp
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popl %ebx
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popl %esi
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popl %edi
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ret
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END(__mpn_sub_n)
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