usr/src/common/bignum/amd64/bignum_amd64.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 /*
  27  * This file contains bignum implementation code that
  28  * is specific to AMD64, but which is still more appropriate
  29  * to write in C, rather than assembly language.
  30  * bignum_amd64_asm.s does all the assembly language code
  31  * for AMD64 specific bignum support.  The assembly language
  32  * source file has pure code, no data.  Let the C compiler
  33  * generate what is needed to handle the variations in
  34  * data representation and addressing, for example,
  35  * statically linked vs PIC.
  36  */
  37
  38 #include "bignum.h"
  39
  40 /*
  41  * The bignum interface deals with arrays of 64-bit "chunks" or "digits".
  42  * Data should be aligned on 8-byte address boundaries for best performance.
  43  */
  44
  45
  46 void
  47 big_mul_vec(BIG_CHUNK_TYPE *r, BIG_CHUNK_TYPE *a, int alen,
  48     BIG_CHUNK_TYPE *b, int blen)
  49 {
  50         int     i;
  51
  52         r[alen] = big_mul_set_vec(r, a, alen, b[0]);
  53         for (i = 1; i < blen; ++i)
  54                 r[alen + i] = big_mul_add_vec(r + i, a, alen, b[i]);
  55 }