blob: 4d458a794c369468040509ae4bd54af0dea106b2 [file] [log] [blame]
/* AMD64 submul_1 -- Multiply a limb vector with a limb and add
* the result to a second limb vector.
* Copyright (C) 1992, 1994, 1998,
* 2001, 2002, 2006 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
* 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_submul_1( mpi_ptr_t res_ptr, (rdi)
* mpi_ptr_t s1_ptr, (rsi)
* mpi_size_t s1_size, (rdx)
* mpi_limb_t s2_limb) (rcx)
GLOBL C_SYMBOL_NAME(_gcry_mpih_submul_1)
movq %rdx, %r11
leaq (%rsi,%r11,8), %rsi
leaq (%rdi,%r11,8), %rdi
negq %r11
xorl %r8d, %r8d
ALIGN(3) /* minimal alignment for claimed speed */
.Loop: movq (%rsi,%r11,8), %rax
movq (%rdi,%r11,8), %r10
mulq %rcx
subq %r8, %r10
movl $0, %r8d
adcl %r8d, %r8d
subq %rax, %r10
adcq %rdx, %r8
movq %r10, (%rdi,%r11,8)
incq %r11
jne .Loop
movq %r8, %rax