OpenBLAS/interface/scal.c

/*********************************************************************/
/* Copyright 2025 The OpenBLAS Project.                              */
/* Copyright 2009, 2010 The University of Texas at Austin.           */
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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;
  FLOAT alpha = *ALPHA;

#else

void CNAME(blasint n, FLOAT alpha, FLOAT *x, blasint incx){

#endif

#ifdef SMP
  int mode, nthreads;
#endif

#ifndef CBLAS
  PRINT_DEBUG_NAME;
#else
  PRINT_DEBUG_CNAME;
#endif

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

#ifdef BGEMM
  float alpha_float;
  SBF16TOS_K(1, &alpha, 1, &alpha_float, 1);
#else
  float alpha_float = alpha;
#endif

  if (alpha_float == ONE) return;

  IDEBUG_START;

  FUNCTION_PROFILE_START();


#ifdef SMP
  if (n <= 1048576 )
	nthreads = 1;
  else
	nthreads = num_cpu_avail(1);


  if (nthreads == 1) {
#endif

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

#ifdef SMP
  } else {

#ifdef DOUBLE
    mode  =  BLAS_DOUBLE | BLAS_REAL;
#else
    mode  =  BLAS_SINGLE | BLAS_REAL;
#endif

    blas_level1_thread(mode, n, 0, 0,
#ifndef CBLAS
		       ALPHA,
#else
		       &alpha,
#endif
		       x, incx, NULL, 0, NULL, 1,  (int (*)(void))SCAL_K, nthreads);

  }
#endif

  FUNCTION_PROFILE_END(1, n, n);

  IDEBUG_END;

  return;

}