OpenBLAS/kernel/power/zscal.c

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/**************************************************************************************
* 2016/03/27 Werner Saar (wernsaar@googlemail.com)
* 	 BLASTEST 		: OK
* 	 CTEST			: OK
* 	 TEST			: OK
*	 LAPACK-TEST		: OK
**************************************************************************************/


#include "common.h"

#pragma GCC optimize "O1"

#if defined(POWER8)
#if defined(DOUBLE)
#include "zscal_microk_power8.c"
#endif
#endif


#ifndef HAVE_KERNEL_8

static void zscal_kernel_8(BLASLONG n, FLOAT *x, FLOAT da_r, FLOAT da_i)
{

	BLASLONG i=0;
	FLOAT *x1=x;
	FLOAT  alpha_r1=da_r;
	FLOAT  alpha_r2=da_r;
	FLOAT  alpha_i1=-da_i;
	FLOAT  alpha_i2=da_i;
	FLOAT  temp00, temp01, temp10, temp11, temp20, temp21, temp30, temp31;
	FLOAT  x0_r, x0_i, x1_r, x1_i, x2_r, x2_i, x3_r, x3_i;

	while ( i<n )
	{
		x0_r = x1[0];
		x0_i = x1[1];
		x1_r = x1[2];
		x1_i = x1[3];
		x2_r = x1[4];
		x2_i = x1[5];
		x3_r = x1[6];
		x3_i = x1[7];

		temp00  = x0_r * alpha_r1;
		temp10  = x1_r * alpha_r1;
		temp20  = x2_r * alpha_r1;
		temp30  = x3_r * alpha_r1;

		temp01  = x0_i * alpha_r2;
		temp11  = x1_i * alpha_r2;
		temp21  = x2_i * alpha_r2;
		temp31  = x3_i * alpha_r2;

		temp00 += x0_i * alpha_i1;
		temp10 += x1_i * alpha_i1;
		temp20 += x2_i * alpha_i1;
		temp30 += x3_i * alpha_i1;

		temp01 += x0_r * alpha_i2;
		temp11 += x1_r * alpha_i2;
		temp21 += x2_r * alpha_i2;
		temp31 += x3_r * alpha_i2;

		x1[0] = temp00;
		x1[1] = temp01;
		x1[2] = temp10;
		x1[3] = temp11;
		x1[4] = temp20;
		x1[5] = temp21;
		x1[6] = temp30;
		x1[7] = temp31;

		x1 += 8;
		i+=4;

	}
	return;


}

#endif

int CNAME(BLASLONG n, BLASLONG dummy0, BLASLONG dummy1, FLOAT da_r,FLOAT da_i, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y, FLOAT *dummy, BLASLONG dummy2)
{
	BLASLONG i=0;
	BLASLONG inc_x2;
	BLASLONG ip = 0;
	FLOAT temp;
	BLASLONG n1;

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

	if ( inc_x <= 0 )
		return(0);

	if (da_r == ZERO && da_i == ZERO) {
	  //clear the vector and return
	  if (inc_x == 1) {
	    memset(x, 0, n*COMPSIZE*SIZE);
	  }else{
	    inc_x2 = 2 * inc_x;
	    for(i=0; i<n; i++){
	      x[ip]=ZERO; 
	      x[ip+1]=ZERO;
	      ip += inc_x2;
	    }
	  }
	  return 0;
	}

	if ( inc_x == 1 )
	{


		n1 = n & -8;
		if ( n1 > 0 )
		{
			zscal_kernel_8(n1, x, da_r, da_i);
			i=n1;
			ip = n1 * 2;

		}

		while ( i < n )
		{

				temp    = da_r * x[ip]   - da_i * x[ip+1] ;
				x[ip+1] = da_r * x[ip+1] + da_i * x[ip]   ;
				x[ip]   = temp;
				ip += 2;
				i++;
		}

	}
	else
	{

		inc_x2 = 2 * inc_x;

		while ( i < n )
		{

				temp    = da_r * x[ip]   - da_i * x[ip+1] ;
				x[ip+1] = da_r * x[ip+1] + da_i * x[ip]   ;
				x[ip]   = temp;
				ip += inc_x2;
				i++;
		}


	}

	return(0);

}