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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) 1992-2024 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 <https://www.gnu.org/licenses/>. */
#include "sysdep.h"
#include "asm-syntax.h"
#define PARMS 4+16 /* space for 4 saved regs */
#define RES PARMS
#define S1 RES+4
#define S2 S1+4
#define SIZE S2+4
.text
ENTRY (__mpn_sub_n)
pushl %edi
cfi_adjust_cfa_offset (4)
pushl %esi
cfi_adjust_cfa_offset (4)
pushl %ebp
cfi_adjust_cfa_offset (4)
pushl %ebx
cfi_adjust_cfa_offset (4)
movl RES(%esp),%edi
cfi_rel_offset (edi, 12)
movl S1(%esp),%esi
cfi_rel_offset (esi, 8)
movl S2(%esp),%ebx
cfi_rel_offset (ebx, 0)
movl SIZE(%esp),%ecx
movl (%ebx),%ebp
cfi_rel_offset (ebp, 4)
decl %ecx
movl %ecx,%edx
shrl $3,%ecx
andl $7,%edx
testl %ecx,%ecx /* zero carry flag */
jz L(end)
pushl %edx
cfi_adjust_cfa_offset (4)
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
cfi_adjust_cfa_offset (-4)
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
cfi_adjust_cfa_offset (-4)
cfi_restore (ebx)
popl %ebp
cfi_adjust_cfa_offset (-4)
cfi_restore (ebp)
popl %esi
cfi_adjust_cfa_offset (-4)
cfi_restore (esi)
popl %edi
cfi_adjust_cfa_offset (-4)
cfi_restore (edi)
ret
END (__mpn_sub_n)
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