89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/***************************************************************************
|
|
Copyright (c) 2013, The OpenBLAS Project
|
|
All rights reserved.
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are
|
|
met:
|
|
1. Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
2. Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in
|
|
the documentation and/or other materials provided with the
|
|
distribution.
|
|
3. Neither the name of the OpenBLAS project nor the names of
|
|
its contributors may be used to endorse or promote products
|
|
derived from this software without specific prior written permission.
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBLAS PROJECT OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
|
|
USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*****************************************************************************/
|
|
|
|
/**************************************************************************************
|
|
* 2013/09/13 Saar
|
|
* BLASTEST float : OK
|
|
* BLASTEST double : OK
|
|
* CTEST : OK
|
|
* TEST : OK
|
|
*
|
|
**************************************************************************************/
|
|
|
|
#include "common.h"
|
|
#include <math.h>
|
|
|
|
#if defined(DOUBLE)
|
|
|
|
#define ABS fabs
|
|
|
|
#else
|
|
|
|
#define ABS fabsf
|
|
|
|
#endif
|
|
|
|
|
|
|
|
FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x)
|
|
{
|
|
BLASLONG i=0;
|
|
FLOAT scale = 0.0;
|
|
FLOAT ssq = 1.0;
|
|
FLOAT absxi = 0.0;
|
|
|
|
|
|
if (n <= 0 || inc_x <= 0) return(0.0);
|
|
if ( n == 1 ) return( ABS(x[0]) );
|
|
|
|
n *= inc_x;
|
|
while(i < n)
|
|
{
|
|
|
|
if ( x[i] != 0.0 )
|
|
{
|
|
absxi = ABS( x[i] );
|
|
if ( scale < absxi )
|
|
{
|
|
ssq = 1 + ssq * ( scale / absxi ) * ( scale / absxi );
|
|
scale = absxi ;
|
|
}
|
|
else
|
|
{
|
|
ssq += ( absxi/scale ) * ( absxi/scale );
|
|
}
|
|
|
|
}
|
|
i += inc_x;
|
|
}
|
|
scale = scale * sqrt( ssq );
|
|
return(scale);
|
|
|
|
}
|
|
|
|
|