OpenBLAS/interface/zscal.c

/*********************************************************************/
/* Copyright 2009, 2010 The University of Texas at Austin.           */
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/* without modification, are permitted provided that the following   */
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/*      copyright notice, this list of conditions and the following  */
/*      disclaimer.                                                  */
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/*   2. Redistributions in binary form must reproduce the above      */
/*      copyright notice, this list of conditions and the following  */
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/*      provided with the distribution.                              */
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/*    THIS  SOFTWARE IS PROVIDED  BY THE  UNIVERSITY OF  TEXAS AT    */
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/*********************************************************************/

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

#ifndef CBLAS

void NAME(blasint *N, FLOAT *ALPHA, FLOAT *x, blasint *INCX){

  blasint n    = *N;
  blasint incx = *INCX;

#ifndef SSCAL
  FLOAT *alpha=ALPHA;
#else
  FLOAT alpha[2] = {ALPHA[0], ZERO};
#endif

#else

#ifndef SSCAL
void CNAME(blasint n, void *VALPHA, void *vx, blasint incx){

  FLOAT *x = (FLOAT*) vx;
  FLOAT *alpha=(FLOAT*)VALPHA;
#else
void CNAME(blasint n, FLOAT alpha_r, void *vx, blasint incx){
  FLOAT *x = (FLOAT*) vx;

  FLOAT alpha[2] = {alpha_r, ZERO};
#endif
#endif

#ifdef SMP
  int mode;
  int nthreads;
#endif

#ifndef CBLAS
  PRINT_DEBUG_NAME;
#else
  PRINT_DEBUG_CNAME;
#endif

  if (incx <= 0 || n <= 0) return;

  if ((alpha[0] == ONE) && (alpha[1] == ZERO)) return;

  IDEBUG_START;

  FUNCTION_PROFILE_START();

#ifdef SMP
  nthreads = num_cpu_avail(1);

  if ( n <= 1048576 )
	nthreads = 1;

  if (nthreads == 1) {
#endif

  SCAL_K(n, 0, 0, alpha[0], alpha[1], x, incx, NULL, 0, NULL, 0);

#ifdef SMP
  } else {
#ifdef DOUBLE
    mode  =  BLAS_DOUBLE | BLAS_COMPLEX;
#else
    mode  =  BLAS_SINGLE | BLAS_COMPLEX;
#endif

    blas_level1_thread(mode, n, 0, 0,  alpha, x, incx, NULL, 0, NULL, 0, (void *)SCAL_K, nthreads);

  }
#endif

  FUNCTION_PROFILE_END(4, n, n);

  IDEBUG_END;

  return;

}