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258 lines
6.4 KiB
C
258 lines
6.4 KiB
C
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Netscape security libraries.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* $Id: mpi_sparc.c,v 1.7 2006/01/22 08:43:57 nelsonb%netscape.com Exp $ */
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/* Multiplication performance enhancements for sparc v8+vis CPUs. */
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#include "mpi-priv.h"
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#include <stddef.h>
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#include <sys/systeminfo.h>
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#include <strings.h>
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/* In the functions below, */
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/* vector y must be 8-byte aligned, and n must be even */
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/* returns carry out of high order word of result */
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/* maximum n is 256 */
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/* vector x += vector y * scaler a; where y is of length n words. */
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extern mp_digit mul_add_inp(mp_digit *x, const mp_digit *y, int n, mp_digit a);
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/* vector z = vector x + vector y * scaler a; where y is of length n words. */
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extern mp_digit mul_add(mp_digit *z, const mp_digit *x, const mp_digit *y,
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int n, mp_digit a);
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/* v8 versions of these functions run on any Sparc v8 CPU. */
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/* This trick works on Sparc V8 CPUs with the Workshop compilers. */
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#define MP_MUL_DxD(a, b, Phi, Plo) \
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{ unsigned long long product = (unsigned long long)a * b; \
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Plo = (mp_digit)product; \
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Phi = (mp_digit)(product >> MP_DIGIT_BIT); }
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/* c = a * b */
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static void
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v8_mpv_mul_d(const mp_digit *a, mp_size a_len, mp_digit b, mp_digit *c)
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{
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#if !defined(MP_NO_MP_WORD)
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mp_digit d = 0;
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/* Inner product: Digits of a */
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while (a_len--) {
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mp_word w = ((mp_word)b * *a++) + d;
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*c++ = ACCUM(w);
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d = CARRYOUT(w);
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}
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*c = d;
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#else
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mp_digit carry = 0;
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while (a_len--) {
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mp_digit a_i = *a++;
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mp_digit a0b0, a1b1;
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MP_MUL_DxD(a_i, b, a1b1, a0b0);
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a0b0 += carry;
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if (a0b0 < carry)
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++a1b1;
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*c++ = a0b0;
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carry = a1b1;
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}
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*c = carry;
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#endif
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}
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/* c += a * b */
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static void
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v8_mpv_mul_d_add(const mp_digit *a, mp_size a_len, mp_digit b, mp_digit *c)
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{
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#if !defined(MP_NO_MP_WORD)
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mp_digit d = 0;
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/* Inner product: Digits of a */
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while (a_len--) {
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mp_word w = ((mp_word)b * *a++) + *c + d;
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*c++ = ACCUM(w);
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d = CARRYOUT(w);
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}
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*c = d;
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#else
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mp_digit carry = 0;
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while (a_len--) {
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mp_digit a_i = *a++;
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mp_digit a0b0, a1b1;
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MP_MUL_DxD(a_i, b, a1b1, a0b0);
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a0b0 += carry;
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if (a0b0 < carry)
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++a1b1;
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a0b0 += a_i = *c;
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if (a0b0 < a_i)
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++a1b1;
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*c++ = a0b0;
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carry = a1b1;
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}
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*c = carry;
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#endif
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}
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/* Presently, this is only used by the Montgomery arithmetic code. */
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/* c += a * b */
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static void
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v8_mpv_mul_d_add_prop(const mp_digit *a, mp_size a_len, mp_digit b, mp_digit *c)
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{
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#if !defined(MP_NO_MP_WORD)
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mp_digit d = 0;
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/* Inner product: Digits of a */
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while (a_len--) {
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mp_word w = ((mp_word)b * *a++) + *c + d;
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*c++ = ACCUM(w);
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d = CARRYOUT(w);
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}
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while (d) {
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mp_word w = (mp_word)*c + d;
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*c++ = ACCUM(w);
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d = CARRYOUT(w);
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}
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#else
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mp_digit carry = 0;
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while (a_len--) {
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mp_digit a_i = *a++;
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mp_digit a0b0, a1b1;
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MP_MUL_DxD(a_i, b, a1b1, a0b0);
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a0b0 += carry;
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if (a0b0 < carry)
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++a1b1;
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a0b0 += a_i = *c;
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if (a0b0 < a_i)
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++a1b1;
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*c++ = a0b0;
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carry = a1b1;
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}
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while (carry) {
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mp_digit c_i = *c;
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carry += c_i;
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*c++ = carry;
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carry = carry < c_i;
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}
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#endif
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}
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/* These functions run only on v8plus+vis or v9+vis CPUs. */
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/* c = a * b */
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void
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s_mpv_mul_d(const mp_digit *a, mp_size a_len, mp_digit b, mp_digit *c)
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{
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mp_digit d;
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mp_digit x[258];
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if (a_len <= 256) {
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if (a == c || ((ptrdiff_t)a & 0x7) != 0 || (a_len & 1) != 0) {
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mp_digit * px;
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px = (((ptrdiff_t)x & 0x7) != 0) ? x + 1 : x;
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memcpy(px, a, a_len * sizeof(*a));
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a = px;
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if (a_len & 1) {
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px[a_len] = 0;
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}
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}
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s_mp_setz(c, a_len + 1);
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d = mul_add_inp(c, a, a_len, b);
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c[a_len] = d;
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} else {
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v8_mpv_mul_d(a, a_len, b, c);
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}
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}
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/* c += a * b, where a is a_len words long. */
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void
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s_mpv_mul_d_add(const mp_digit *a, mp_size a_len, mp_digit b, mp_digit *c)
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{
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mp_digit d;
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mp_digit x[258];
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if (a_len <= 256) {
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if (((ptrdiff_t)a & 0x7) != 0 || (a_len & 1) != 0) {
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mp_digit * px;
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px = (((ptrdiff_t)x & 0x7) != 0) ? x + 1 : x;
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memcpy(px, a, a_len * sizeof(*a));
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a = px;
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if (a_len & 1) {
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px[a_len] = 0;
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}
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}
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d = mul_add_inp(c, a, a_len, b);
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c[a_len] = d;
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} else {
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v8_mpv_mul_d_add(a, a_len, b, c);
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}
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}
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/* c += a * b, where a is y words long. */
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void
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s_mpv_mul_d_add_prop(const mp_digit *a, mp_size a_len, mp_digit b, mp_digit *c)
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{
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mp_digit d;
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mp_digit x[258];
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if (a_len <= 256) {
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if (((ptrdiff_t)a & 0x7) != 0 || (a_len & 1) != 0) {
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mp_digit * px;
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px = (((ptrdiff_t)x & 0x7) != 0) ? x + 1 : x;
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memcpy(px, a, a_len * sizeof(*a));
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a = px;
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if (a_len & 1) {
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px[a_len] = 0;
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}
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}
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d = mul_add_inp(c, a, a_len, b);
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if (d) {
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c += a_len;
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do {
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mp_digit sum = d + *c;
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*c++ = sum;
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d = sum < d;
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} while (d);
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}
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} else {
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v8_mpv_mul_d_add_prop(a, a_len, b, c);
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}
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}
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