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/**************************************************************************
**
** Copyright (C) 1993 David E. Stewart & Zbigniew Leyk, all rights reserved.
**
** Meschach Library
**
** This Meschach Library is provided "as is" without any express
** or implied warranty of any kind with respect to this software.
** In particular the authors shall not be liable for any direct,
** indirect, special, incidental or consequential damages arising
** in any way from use of the software.
**
** Everyone is granted permission to copy, modify and redistribute this
** Meschach Library, provided:
** 1. All copies contain this copyright notice.
** 2. All modified copies shall carry a notice stating who
** made the last modification and the date of such modification.
** 3. No charge is made for this software or works derived from it.
** This clause shall not be construed as constraining other software
** distributed on the same medium as this software, nor is a
** distribution fee considered a charge.
**
***************************************************************************/
/*
This file contains basic routines which are used by the functions
in meschach.a etc.
These are the routines that should be modified in order to take
full advantage of specialised architectures (pipelining, vector
processors etc).
*/
static char *rcsid = "$Id: machine.c,v 1.4 1994/01/13 05:28:56 des Exp $";
#include "machine.h"
/* __ip__ -- inner product */
#ifndef ANSI_C
double __ip__(dp1,dp2,len)
register Real *dp1, *dp2;
int len;
#else
double __ip__(const Real *dp1, const Real *dp2, int len)
#endif
{
#ifdef VUNROLL
register int len4;
register Real sum1, sum2, sum3;
#endif
register int i;
register Real sum;
sum = 0.0;
#ifdef VUNROLL
sum1 = sum2 = sum3 = 0.0;
len4 = len / 4;
len = len % 4;
for ( i = 0; i < len4; i++ )
{
sum += dp1[4*i]*dp2[4*i];
sum1 += dp1[4*i+1]*dp2[4*i+1];
sum2 += dp1[4*i+2]*dp2[4*i+2];
sum3 += dp1[4*i+3]*dp2[4*i+3];
}
sum += sum1 + sum2 + sum3;
dp1 += 4*len4; dp2 += 4*len4;
#endif
for ( i = 0; i < len; i++ )
sum += dp1[i]*dp2[i];
return sum;
}
/* __mltadd__ -- scalar multiply and add c.f. v_mltadd() */
#ifndef ANSI_C
void __mltadd__(dp1,dp2,s,len)
register Real *dp1, *dp2;
register double s;
register int len;
#else
void __mltadd__(Real *dp1, const Real *dp2, double s, int len)
#endif
{
register int i;
#ifdef VUNROLL
register int len4;
len4 = len / 4;
len = len % 4;
for ( i = 0; i < len4; i++ )
{
dp1[4*i] += s*dp2[4*i];
dp1[4*i+1] += s*dp2[4*i+1];
dp1[4*i+2] += s*dp2[4*i+2];
dp1[4*i+3] += s*dp2[4*i+3];
}
dp1 += 4*len4; dp2 += 4*len4;
#endif
for ( i = 0; i < len; i++ )
dp1[i] += s*dp2[i];
}
/* __smlt__ scalar multiply array c.f. sv_mlt() */
#ifndef ANSI_C
void __smlt__(dp,s,out,len)
register Real *dp, *out;
register double s;
register int len;
#else
void __smlt__(const Real *dp, double s, Real *out, int len)
#endif
{
register int i;
for ( i = 0; i < len; i++ )
out[i] = s*dp[i];
}
/* __add__ -- add arrays c.f. v_add() */
#ifndef ANSI_C
void __add__(dp1,dp2,out,len)
register Real *dp1, *dp2, *out;
register int len;
#else
void __add__(const Real *dp1, const Real *dp2, Real *out, int len)
#endif
{
register int i;
for ( i = 0; i < len; i++ )
out[i] = dp1[i] + dp2[i];
}
/* __sub__ -- subtract arrays c.f. v_sub() */
#ifndef ANSI_C
void __sub__(dp1,dp2,out,len)
register Real *dp1, *dp2, *out;
register int len;
#else
void __sub__(const Real *dp1, const Real *dp2, Real *out, int len)
#endif
{
register int i;
for ( i = 0; i < len; i++ )
out[i] = dp1[i] - dp2[i];
}
/* __zero__ -- zeros an array of floating point numbers */
#ifndef ANSI_C
void __zero__(dp,len)
register Real *dp;
register int len;
#else
void __zero__(Real *dp, int len)
#endif
{
#ifdef CHAR0ISDBL0
/* if a floating point zero is equivalent to a string of nulls */
MEM_ZERO((char *)dp,len*sizeof(Real));
#else
/* else, need to zero the array entry by entry */
int i;
for ( i = 0; i < len; i++ )
dp[i] = 0.0;
#endif
}
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