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/* Intel Pentium-4 mpn_mul_1 -- Multiply a limb vector with a limb and store
* the result in a second limb vector.
*
* Copyright 2001, 2002, 2003, 2005 Free Software Foundation, Inc.
*
* This file is part of Libgcrypt.
*
* Libgcrypt 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.
*
* Libgcrypt 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*
* Note: This code is heavily based on the GNU MP Library.
* Actually it's the same code with only minor changes in the
* way the data is stored; this is to support the abstraction
* of an optional secure memory allocation which may be used
* to avoid revealing of sensitive data due to paging etc.
*/
#include "sysdep.h"
#include "asm-syntax.h"
/*******************
* mpi_limb_t
* _gcry_mpih_mul_1( mpi_ptr_t res_ptr, (sp + 4)
* mpi_ptr_t s1_ptr, (sp + 8)
* mpi_size_t s1_size, (sp + 12)
* mpi_limb_t s2_limb) (sp + 16)
*
* src != dst src == dst
* P6 model 9 (Banias) ?.?
* P6 model 13 (Dothan) 4.75 4.75
* P4 model 0 (Willamette) 4.0 6.0
* P4 model 1 (?) 4.0 6.0
* P4 model 2 (Northwood) 4.0 6.0
* P4 model 3 (Prescott) ?.? ?.?
* P4 model 4 (Nocona) ?.? ?.?
* Unfortunately when src==dst the write-combining described in
* pentium4/README takes us up to 6 c/l.
*
*/
TEXT
ALIGN (3)
GLOBL C_SYMBOL_NAME(_gcry_mpih_mul_1)
C_SYMBOL_NAME(_gcry_mpih_mul_1:);
pxor %mm0, %mm0
.Lstart_1c:
movl 8(%esp), %eax
movd 16(%esp), %mm7
movl 4(%esp), %edx
movl 12(%esp), %ecx
.Ltop:
/*
C eax src, incrementing
C ebx
C ecx counter, size iterations
C edx dst, incrementing
C
C mm0 carry limb
C mm7 multiplier
*/
movd (%eax), %mm1
addl $4, %eax
pmuludq %mm7, %mm1
paddq %mm1, %mm0
movd %mm0, (%edx)
addl $4, %edx
psrlq $32, %mm0
subl $1, %ecx
jnz .Ltop
movd %mm0, %eax
emms
ret
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