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glibc/sysdeps/i386/sub_n.S
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/* i80386 __mpn_sub_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_sub_n) | |
C_SYMBOL_NAME(__mpn_sub_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 | |
sbbl (%edx),%eax | |
movl %eax,(%edi) | |
movl 4(%esi),%eax | |
sbbl 4(%edx),%eax | |
movl %eax,4(%edi) | |
movl 8(%esi),%eax | |
sbbl 8(%edx),%eax | |
movl %eax,8(%edi) | |
movl 12(%esi),%eax | |
sbbl 12(%edx),%eax | |
movl %eax,12(%edi) | |
movl 16(%esi),%eax | |
sbbl 16(%edx),%eax | |
movl %eax,16(%edi) | |
movl 20(%esi),%eax | |
sbbl 20(%edx),%eax | |
movl %eax,20(%edi) | |
movl 24(%esi),%eax | |
sbbl 24(%edx),%eax | |
movl %eax,24(%edi) | |
movl 28(%esi),%eax | |
sbbl 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 |