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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) || defined(POWER9)
#include "drot_microk_power8.c"
#endif


#ifndef HAVE_KERNEL_16

static void drot_kernel_16(BLASLONG n, FLOAT *x, FLOAT *y, FLOAT c, FLOAT s)
{

	BLASLONG i=0;
	FLOAT f0, f1, f2, f3;
	FLOAT x00, x01, x02, x03;
	FLOAT g0, g1, g2, g3;
	FLOAT y00, y01, y02, y03;
	FLOAT *x1=x;
	FLOAT *y1=y;

	while ( i<n )
	{

		x00 = x1[0];
		y00 = y1[0];
		x01 = x1[1];
		y01 = y1[1];
		x02 = x1[2];
		y02 = y1[2];
		x03 = x1[3];
		y03 = y1[3];

		f0 = c*x00 + s*y00;
		g0 = c*y00 - s*x00;
		f1 = c*x01 + s*y01;
		g1 = c*y01 - s*x01;
		f2 = c*x02 + s*y02;
		g2 = c*y02 - s*x02;
		f3 = c*x03 + s*y03;
		g3 = c*y03 - s*x03;

		x1[0] = f0;
		y1[0] = g0;
		x1[1] = f1;
		y1[1] = g1;
		x1[2] = f2;
		y1[2] = g2;
		x1[3] = f3;
		y1[3] = g3;

		x1 += 4;
		y1 += 4;

		i+=4;
	}
	return;

}


#endif


int CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y, FLOAT c, FLOAT s)
{
	BLASLONG i=0;
	BLASLONG ix=0,iy=0;
	FLOAT *x1=x;
	FLOAT *y1=y;
	FLOAT temp;

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

	if ( (inc_x == 1) && (inc_y == 1) )
	{

		BLASLONG n1 = n & -16;
		if ( n1 > 0 )
		{
			drot_kernel_16(n1, x1, y1, c, s);
			i=n1;
		}

		while(i < n)
		{
			temp  = c*x[i] + s*y[i] ;
			y[i]  = c*y[i] - s*x[i] ;
			x[i]  = temp ;

			i++ ;

		}


	}
	else
	{

		while(i < n)
		{
			temp   = c*x[ix] + s*y[iy] ;
			y[iy]  = c*y[iy] - s*x[ix] ;
			x[ix]  = temp ;

			ix += inc_x ;
			iy += inc_y ;
			i++ ;

		}

	}
	return(0);

}


