OpenBLAS/interface/zaxpy.c

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/* 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
#if  defined(Z13)
#define MULTI_THREAD_MINIMAL  200000
#else
#define MULTI_THREAD_MINIMAL  10000
#endif
#ifndef CBLAS

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

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

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

  FLOAT alpha_r = *(ALPHA + 0);
  FLOAT alpha_i = *(ALPHA + 1);

#ifdef SMP
  int mode, nthreads;
#endif

#ifndef CBLAS
  PRINT_DEBUG_NAME;
#else
  PRINT_DEBUG_CNAME;
#endif

  if (n <= 0) return;

  if ((alpha_r == ZERO) && (alpha_i == ZERO)) return;

  if (incx == 0 && incy == 0) {
  *y += n * (alpha_r * (*x) - alpha_i* (*(x+1)) );
  *(y+1) += n * (alpha_i * (*x) + alpha_r * (*(x +1)) );
  return;
  }
  
  IDEBUG_START;

  FUNCTION_PROFILE_START();

  if (incx < 0) x -= (n - 1) * incx * 2;
  if (incy < 0) y -= (n - 1) * incy * 2;

#ifdef SMP
  //disable multi-thread when incx==0 or incy==0
  //In that case, the threads would be dependent.
  //
  //Temporarily work-around the low performance issue with small input size &
  //multithreads.
  if (incx == 0 || incy == 0 || n <= MULTI_THREAD_MINIMAL)
	  nthreads = 1;
  else
	  nthreads = num_cpu_avail(1);

  if (nthreads == 1) {
#endif

#ifndef CONJ
    AXPYU_K (n, 0, 0, alpha_r, alpha_i, x, incx, y, incy, NULL, 0);
#else
    AXPYC_K(n, 0, 0, alpha_r, alpha_i, x, incx, y, incy, NULL, 0);
#endif

#ifdef SMP
  } else {

#ifdef XDOUBLE
    mode  =  BLAS_XDOUBLE | BLAS_COMPLEX;
#elif defined(DOUBLE)
    mode  =  BLAS_DOUBLE  | BLAS_COMPLEX;
#else
    mode  =  BLAS_SINGLE  | BLAS_COMPLEX;
#endif

    blas_level1_thread(mode, n, 0, 0, ALPHA, x, incx, y, incy, NULL, 0,
#ifndef CONJ
                       (int (*)(void))AXPYU_K,
#else
                       (int (*)(void))AXPYC_K,
#endif
		       nthreads);
  }
#endif

  FUNCTION_PROFILE_END(4, 2 * n, 2 * n);

  IDEBUG_END;

  return;

}