OpenBLAS/interface/nrm2.c

/*********************************************************************/
/* Copyright 2009, 2010 The University of Texas at Austin.           */
/* All rights reserved.                                              */
/*                                                                   */
/* Redistribution and use in source and binary forms, with or        */
/* without modification, are permitted provided that the following   */
/* conditions are met:                                               */
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/*   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.                              */
/*                                                                   */
/*    THIS  SOFTWARE IS PROVIDED  BY THE  UNIVERSITY OF  TEXAS AT    */
/*    AUSTIN  ``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    */
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/* documentation are those of the authors and should not be          */
/* interpreted as representing official policies, either expressed   */
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/*********************************************************************/

#include <stdio.h>
#include "common.h"
#ifdef FUNCTION_PROFILE
#include "functable.h"
#endif

#ifndef CBLAS

FLOATRET NAME(blasint *N, FLOAT *x, blasint *INCX){

  BLASLONG n    = *N;
  BLASLONG incx = *INCX;
  FLOATRET ret;

  PRINT_DEBUG_NAME;

  if (n <= 0) return 0.;

#ifndef COMPLEX
  if (n == 1)
#ifdef DOUBLE
    return fabs(x[0]);
#else
    return fabsf(x[0]);
#endif
#endif

  if (incx < 0) 
#ifdef COMPLEX    
    x -= (n - 1) * incx * 2;
#else
    x -= (n - 1) * incx;
#endif
  IDEBUG_START;

  FUNCTION_PROFILE_START();

  ret = (FLOATRET)NRM2_K(n, x, incx);

  FUNCTION_PROFILE_END(COMPSIZE, n, 2 * n);

  IDEBUG_END;

  return ret;
}

#else

#ifdef COMPLEX
FLOAT CNAME(blasint n, void *vx, blasint incx){
  FLOAT *x = (FLOAT*) vx;
#else
FLOAT CNAME(blasint n, FLOAT *x, blasint incx){
#endif

  FLOAT ret;

  PRINT_DEBUG_CNAME;

  if (n <= 0) return 0.;

  #ifndef COMPLEX
  if (n == 1)
#ifdef DOUBLE
    return fabs(x[0]);
#else
    return fabsf(x[0]);
#endif
#endif

  if (incx < 0) 
#ifdef COMPLEX    
    x -= (n - 1) * incx * 2;
#else
    x -= (n - 1) * incx;
#endif
  
  IDEBUG_START;

  FUNCTION_PROFILE_START();

  ret = NRM2_K(n, x, incx);

  FUNCTION_PROFILE_END(COMPSIZE, n, 2 * n);

  IDEBUG_END;

  return ret;
}

#endif