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/* Pentium __mpn_sub_n -- Subtract two limb vectors of the same length > 0
and store difference in a third limb vector.
Copyright (C) 1992, 94, 95, 96, 97, 98, 2000 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., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include "sysdep.h"
#include "asm-syntax.h"
#include "bp-sym.h"
#include "bp-asm.h"
#define PARMS LINKAGE+16 /* space for 4 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))
ENTER
pushl %edi
pushl %esi
pushl %ebp
pushl %ebx
movl RES(%esp),%edi
movl S1(%esp),%esi
movl S2(%esp),%ebx
movl SIZE(%esp),%ecx
#if __BOUNDED_POINTERS__
shll $2, %ecx /* convert limbs to bytes */
CHECK_BOUNDS_BOTH_WIDE (%edi, RES(%esp), %ecx)
CHECK_BOUNDS_BOTH_WIDE (%esi, S1(%esp), %ecx)
CHECK_BOUNDS_BOTH_WIDE (%ebx, S2(%esp), %ecx)
shrl $2, %ecx
#endif
movl (%ebx),%ebp
decl %ecx
movl %ecx,%edx
shrl $3,%ecx
andl $7,%edx
testl %ecx,%ecx /* zero carry flag */
jz L(end)
pushl %edx
ALIGN (3)
L(oop): movl 28(%edi),%eax /* fetch destination cache line */
leal 32(%edi),%edi
L(1): movl (%esi),%eax
movl 4(%esi),%edx
sbbl %ebp,%eax
movl 4(%ebx),%ebp
sbbl %ebp,%edx
movl 8(%ebx),%ebp
movl %eax,-32(%edi)
movl %edx,-28(%edi)
L(2): movl 8(%esi),%eax
movl 12(%esi),%edx
sbbl %ebp,%eax
movl 12(%ebx),%ebp
sbbl %ebp,%edx
movl 16(%ebx),%ebp
movl %eax,-24(%edi)
movl %edx,-20(%edi)
L(3): movl 16(%esi),%eax
movl 20(%esi),%edx
sbbl %ebp,%eax
movl 20(%ebx),%ebp
sbbl %ebp,%edx
movl 24(%ebx),%ebp
movl %eax,-16(%edi)
movl %edx,-12(%edi)
L(4): movl 24(%esi),%eax
movl 28(%esi),%edx
sbbl %ebp,%eax
movl 28(%ebx),%ebp
sbbl %ebp,%edx
movl 32(%ebx),%ebp
movl %eax,-8(%edi)
movl %edx,-4(%edi)
leal 32(%esi),%esi
leal 32(%ebx),%ebx
decl %ecx
jnz L(oop)
popl %edx
L(end):
decl %edx /* test %edx w/o clobbering carry */
js L(end2)
incl %edx
L(oop2):
leal 4(%edi),%edi
movl (%esi),%eax
sbbl %ebp,%eax
movl 4(%ebx),%ebp
movl %eax,-4(%edi)
leal 4(%esi),%esi
leal 4(%ebx),%ebx
decl %edx
jnz L(oop2)
L(end2):
movl (%esi),%eax
sbbl %ebp,%eax
movl %eax,(%edi)
sbbl %eax,%eax
negl %eax
popl %ebx
popl %ebp
popl %esi
popl %edi
LEAVE
ret
END (BP_SYM (__mpn_sub_n))
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