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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Multiple Precision Integer optimization code for
* the Compaq Alpha processor.
*
* The Initial Developer of the Original Code is
* Richard C. Swift.
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
*
* Contributor(s): Richard C. Swift (swift@netscape.com)
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "mpi-priv.h"
#include <c_asm.h>
#define MP_MUL_DxD(a, b, Phi, Plo) \
{ Plo = asm ("mulq %a0, %a1, %v0", a, b); \
Phi = asm ("umulh %a0, %a1, %v0", a, b); } \
/* This is empty for the loop in s_mpv_mul_d */
#define CARRY_ADD
#define ONE_MUL \
a_i = *a++; \
MP_MUL_DxD(a_i, b, a1b1, a0b0); \
a0b0 += carry; \
if (a0b0 < carry) \
++a1b1; \
CARRY_ADD \
*c++ = a0b0; \
carry = a1b1; \
#define FOUR_MUL \
ONE_MUL \
ONE_MUL \
ONE_MUL \
ONE_MUL \
#define SIXTEEN_MUL \
FOUR_MUL \
FOUR_MUL \
FOUR_MUL \
FOUR_MUL \
#define THIRTYTWO_MUL \
SIXTEEN_MUL \
SIXTEEN_MUL \
#define ONETWENTYEIGHT_MUL \
THIRTYTWO_MUL \
THIRTYTWO_MUL \
THIRTYTWO_MUL \
THIRTYTWO_MUL \
#define EXPAND_256(CALL) \
mp_digit carry = 0; \
mp_digit a_i; \
mp_digit a0b0, a1b1; \
if (a_len &255) { \
if (a_len &1) { \
ONE_MUL \
} \
if (a_len &2) { \
ONE_MUL \
ONE_MUL \
} \
if (a_len &4) { \
FOUR_MUL \
} \
if (a_len &8) { \
FOUR_MUL \
FOUR_MUL \
} \
if (a_len & 16 ) { \
SIXTEEN_MUL \
} \
if (a_len & 32 ) { \
THIRTYTWO_MUL \
} \
if (a_len & 64 ) { \
THIRTYTWO_MUL \
THIRTYTWO_MUL \
} \
if (a_len & 128) { \
ONETWENTYEIGHT_MUL \
} \
a_len = a_len & (-256); \
} \
if (a_len>=256 ) { \
carry = CALL(a, a_len, b, c, carry); \
c += a_len; \
} \
#define FUNC_NAME(NAME) \
mp_digit NAME(const mp_digit *a, \
mp_size a_len, \
mp_digit b, mp_digit *c, \
mp_digit carry) \
#define DECLARE_MUL_256(FNAME) \
FUNC_NAME(FNAME) \
{ \
mp_digit a_i; \
mp_digit a0b0, a1b1; \
while (a_len) { \
ONETWENTYEIGHT_MUL \
ONETWENTYEIGHT_MUL \
a_len-= 256; \
} \
return carry; \
} \
/* Expanding the loop in s_mpv_mul_d appeared to slow down the
(admittedly) small number of tests (i.e., timetest) used to
measure performance, so this define disables that optimization. */
#define DO_NOT_EXPAND 1
/* Need forward declaration so it can be instantiated after
the routine that uses it; this helps locality somewhat */
#if !defined(DO_NOT_EXPAND)
FUNC_NAME(s_mpv_mul_d_MUL256);
#endif
/* c = a * b */
void s_mpv_mul_d(const mp_digit *a, mp_size a_len,
mp_digit b, mp_digit *c)
{
#if defined(DO_NOT_EXPAND)
mp_digit carry = 0;
while (a_len--) {
mp_digit a_i = *a++;
mp_digit a0b0, a1b1;
MP_MUL_DxD(a_i, b, a1b1, a0b0);
a0b0 += carry;
if (a0b0 < carry)
++a1b1;
*c++ = a0b0;
carry = a1b1;
}
#else
EXPAND_256(s_mpv_mul_d_MUL256)
#endif
*c = carry;
}
#if !defined(DO_NOT_EXPAND)
DECLARE_MUL_256(s_mpv_mul_d_MUL256)
#endif
#undef CARRY_ADD
/* This is redefined for the loop in s_mpv_mul_d_add */
#define CARRY_ADD \
a0b0 += a_i = *c; \
if (a0b0 < a_i) \
++a1b1; \
/* Need forward declaration so it can be instantiated between the
two routines that use it; this helps locality somewhat */
FUNC_NAME(s_mpv_mul_d_add_MUL256);
/* c += a * b */
void s_mpv_mul_d_add(const mp_digit *a, mp_size a_len,
mp_digit b, mp_digit *c)
{
EXPAND_256(s_mpv_mul_d_add_MUL256)
*c = carry;
}
/* Instantiate multiply 256 routine here */
DECLARE_MUL_256(s_mpv_mul_d_add_MUL256)
/* Presently, this is only used by the Montgomery arithmetic code. */
/* c += a * b */
void s_mpv_mul_d_add_prop(const mp_digit *a, mp_size a_len,
mp_digit b, mp_digit *c)
{
EXPAND_256(s_mpv_mul_d_add_MUL256)
while (carry) {
mp_digit c_i = *c;
carry += c_i;
*c++ = carry;
carry = carry < c_i;
}
}
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