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/* Pentium __mpn_add_n -- Add two limb vectors of the same length > 0 and store
sum in a third limb vector.
Copyright (C) 1992, 1994, 1995 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"
#define t1 %eax
#define t2 %edx
#define src1 %esi
#define src2 %ebp
#define dst %edi
#define x %ebx
.text
ALIGN (3)
.globl C_SYMBOL_NAME(__mpn_add_n)
C_SYMBOL_NAME(__mpn_add_n:)
pushl %edi
pushl %esi
pushl %ebx
pushl %ebp
movl 20(%esp),dst /* res_ptr */
movl 24(%esp),src1 /* s1_ptr */
movl 28(%esp),src2 /* s2_ptr */
movl 32(%esp),%ecx /* size */
movl (src2),x
decl %ecx
movl %ecx,t2
shrl $3,%ecx
andl $7,t2
testl %ecx,%ecx /* zero carry flag */
jz Lend
pushl t2
ALIGN (3)
Loop: movl 28(dst),%eax /* fetch destination cache line */
leal 32(dst),dst
L1: movl (src1),t1
movl 4(src1),t2
adcl x,t1
movl 4(src2),x
adcl x,t2
movl 8(src2),x
movl t1,-32(dst)
movl t2,-28(dst)
L2: movl 8(src1),t1
movl 12(src1),t2
adcl x,t1
movl 12(src2),x
adcl x,t2
movl 16(src2),x
movl t1,-24(dst)
movl t2,-20(dst)
L3: movl 16(src1),t1
movl 20(src1),t2
adcl x,t1
movl 20(src2),x
adcl x,t2
movl 24(src2),x
movl t1,-16(dst)
movl t2,-12(dst)
L4: movl 24(src1),t1
movl 28(src1),t2
adcl x,t1
movl 28(src2),x
adcl x,t2
movl 32(src2),x
movl t1,-8(dst)
movl t2,-4(dst)
leal 32(src1),src1
leal 32(src2),src2
decl %ecx
jnz Loop
popl t2
Lend:
decl t2 /* test t2 w/o clobbering carry */
js Lend2
incl t2
Loop2:
leal 4(dst),dst
movl (src1),t1
adcl x,t1
movl 4(src2),x
movl t1,-4(dst)
leal 4(src1),src1
leal 4(src2),src2
decl t2
jnz Loop2
Lend2:
movl (src1),t1
adcl x,t1
movl t1,(dst)
sbbl %eax,%eax
negl %eax
popl %ebp
popl %ebx
popl %esi
popl %edi
ret
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