/***************************************************************************
Copyright (c) 2014, The OpenBLAS Project
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modification, are permitted provided that the following conditions are
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer in
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its contributors may be used to endorse or promote products
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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*****************************************************************************/

#include <stdlib.h>
#include <stdio.h>
#include "common.h"


#if defined(HASWELL)
#include "zgemv_n_microk_haswell-4.c"
#elif defined(SANDYBRIDGE)
#include "zgemv_n_microk_sandy-4.c"
#endif


#define NBMAX 1024

#ifndef HAVE_KERNEL_4x4

static void zgemv_kernel_4x4(BLASLONG n, FLOAT **ap, FLOAT *x, FLOAT *y)
{
	BLASLONG i;
	FLOAT *a0,*a1,*a2,*a3;
	a0 = ap[0];
	a1 = ap[1];
	a2 = ap[2];
	a3 = ap[3];

	for ( i=0; i< 2*n; i+=2 )
	{
#if ( !defined(CONJ) && !defined(XCONJ) ) || ( defined(CONJ) && defined(XCONJ) )
		y[i]   += a0[i]*x[0] - a0[i+1] * x[1];
		y[i+1] += a0[i]*x[1] + a0[i+1] * x[0];
		y[i]   += a1[i]*x[2] - a1[i+1] * x[3];
		y[i+1] += a1[i]*x[3] + a1[i+1] * x[2];
		y[i]   += a2[i]*x[4] - a2[i+1] * x[5];
		y[i+1] += a2[i]*x[5] + a2[i+1] * x[4];
		y[i]   += a3[i]*x[6] - a3[i+1] * x[7];
		y[i+1] += a3[i]*x[7] + a3[i+1] * x[6];
#else 
		y[i]   += a0[i]*x[0] + a0[i+1] * x[1];
		y[i+1] += a0[i]*x[1] - a0[i+1] * x[0];
		y[i]   += a1[i]*x[2] + a1[i+1] * x[3];
		y[i+1] += a1[i]*x[3] - a1[i+1] * x[2];
		y[i]   += a2[i]*x[4] + a2[i+1] * x[5];
		y[i+1] += a2[i]*x[5] - a2[i+1] * x[4];
		y[i]   += a3[i]*x[6] + a3[i+1] * x[7];
		y[i+1] += a3[i]*x[7] - a3[i+1] * x[6];
#endif
	}
}
	
#endif



#ifndef HAVE_KERNEL_4x2

static void zgemv_kernel_4x2(BLASLONG n, FLOAT **ap, FLOAT *x, FLOAT *y)
{
	BLASLONG i;
	FLOAT *a0,*a1;
	a0 = ap[0];
	a1 = ap[1];

	for ( i=0; i< 2*n; i+=2 )
	{
#if ( !defined(CONJ) && !defined(XCONJ) ) || ( defined(CONJ) && defined(XCONJ) )
		y[i]   += a0[i]*x[0] - a0[i+1] * x[1];
		y[i+1] += a0[i]*x[1] + a0[i+1] * x[0];
		y[i]   += a1[i]*x[2] - a1[i+1] * x[3];
		y[i+1] += a1[i]*x[3] + a1[i+1] * x[2];
#else 
		y[i]   += a0[i]*x[0] + a0[i+1] * x[1];
		y[i+1] += a0[i]*x[1] - a0[i+1] * x[0];
		y[i]   += a1[i]*x[2] + a1[i+1] * x[3];
		y[i+1] += a1[i]*x[3] - a1[i+1] * x[2];
#endif
	}
}
	
#endif




#ifndef HAVE_KERNEL_4x1


static void zgemv_kernel_4x1(BLASLONG n, FLOAT *ap, FLOAT *x, FLOAT *y)
{
	BLASLONG i;
	FLOAT *a0;
	a0 = ap;

	for ( i=0; i< 2*n; i+=2 )
	{
#if ( !defined(CONJ) && !defined(XCONJ) ) || ( defined(CONJ) && defined(XCONJ) )
		y[i]   += a0[i]*x[0] - a0[i+1] * x[1];
		y[i+1] += a0[i]*x[1] + a0[i+1] * x[0];
#else 
		y[i]   += a0[i]*x[0] + a0[i+1] * x[1];
		y[i+1] += a0[i]*x[1] - a0[i+1] * x[0];
#endif

	}
}


#endif


#ifndef HAVE_KERNEL_ADDY

static void add_y(BLASLONG n, FLOAT *src, FLOAT *dest, BLASLONG inc_dest,FLOAT alpha_r, FLOAT alpha_i)  __attribute__ ((noinline));

static void add_y(BLASLONG n, FLOAT *src, FLOAT *dest, BLASLONG inc_dest,FLOAT alpha_r, FLOAT alpha_i)
{
	BLASLONG i;

	if ( inc_dest != 2 )
	{

		FLOAT temp_r;
		FLOAT temp_i;
		for ( i=0; i<n; i++ )
		{
#if !defined(XCONJ) 
			temp_r = alpha_r * src[0] - alpha_i * src[1];
			temp_i = alpha_r * src[1] + alpha_i * src[0];
#else
			temp_r =  alpha_r * src[0] + alpha_i * src[1];
			temp_i = -alpha_r * src[1] + alpha_i * src[0];
#endif

			*dest += temp_r;
			*(dest+1) += temp_i;

			src+=2;
			dest += inc_dest;
		}
		return;
	}

	FLOAT temp_r0;
	FLOAT temp_i0;
	FLOAT temp_r1;
	FLOAT temp_i1;
	FLOAT temp_r2;
	FLOAT temp_i2;
	FLOAT temp_r3;
	FLOAT temp_i3;
	for ( i=0; i<n; i+=4 )
	{
#if !defined(XCONJ) 
		temp_r0 = alpha_r * src[0] - alpha_i * src[1];
		temp_i0 = alpha_r * src[1] + alpha_i * src[0];
		temp_r1 = alpha_r * src[2] - alpha_i * src[3];
		temp_i1 = alpha_r * src[3] + alpha_i * src[2];
		temp_r2 = alpha_r * src[4] - alpha_i * src[5];
		temp_i2 = alpha_r * src[5] + alpha_i * src[4];
		temp_r3 = alpha_r * src[6] - alpha_i * src[7];
		temp_i3 = alpha_r * src[7] + alpha_i * src[6];
#else
		temp_r0 =  alpha_r * src[0] + alpha_i * src[1];
		temp_i0 = -alpha_r * src[1] + alpha_i * src[0];
		temp_r1 =  alpha_r * src[2] + alpha_i * src[3];
		temp_i1 = -alpha_r * src[3] + alpha_i * src[2];
		temp_r2 =  alpha_r * src[4] + alpha_i * src[5];
		temp_i2 = -alpha_r * src[5] + alpha_i * src[4];
		temp_r3 =  alpha_r * src[6] + alpha_i * src[7];
		temp_i3 = -alpha_r * src[7] + alpha_i * src[6];
#endif

		dest[0]   += temp_r0;
		dest[1]   += temp_i0;
		dest[2]   += temp_r1;
		dest[3]   += temp_i1;
		dest[4]   += temp_r2;
		dest[5]   += temp_i2;
		dest[6]   += temp_r3;
		dest[7]   += temp_i3;

		src  += 8;
		dest += 8;
	}
	return;

}

#endif

int CNAME(BLASLONG m, BLASLONG n, BLASLONG dummy1, FLOAT alpha_r,FLOAT alpha_i, FLOAT *a, BLASLONG lda, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y, FLOAT *buffer)
{
	BLASLONG i;
	BLASLONG j;
	FLOAT *a_ptr;
	FLOAT *x_ptr;
	FLOAT *y_ptr;
	FLOAT *ap[4];
	BLASLONG n1;
	BLASLONG m1;
	BLASLONG m2;
	BLASLONG m3;
	BLASLONG n2;
	BLASLONG lda4;
	FLOAT xbuffer[8],*ybuffer;


#if 0
printf("%s %d %d %.16f %.16f %d %d %d\n","zgemv_n",m,n,alpha_r,alpha_i,lda,inc_x,inc_y);
#endif

	if ( m < 1 ) return(0);
	if ( n < 1 ) return(0);

	ybuffer = buffer;
	
	inc_x *= 2;
	inc_y *= 2;
	lda   *= 2;
	lda4  = 4 * lda;

	n1 = n / 4 ;
	n2 = n % 4 ;
	
	m3 = m % 4;
	m1 = m - ( m % 4 );
	m2 = (m % NBMAX) - (m % 4) ;
	
	y_ptr = y;

	BLASLONG NB = NBMAX;

	while ( NB == NBMAX )
	{
		
		m1 -= NB;
		if ( m1 < 0)
		{
			if ( m2 == 0 ) break;	
			NB = m2;
		}
		
		a_ptr = a;
		ap[0] = a_ptr;
		ap[1] = a_ptr + lda;
		ap[2] = ap[1] + lda;
		ap[3] = ap[2] + lda;
		x_ptr = x;
		//zero_y(NB,ybuffer);
		memset(ybuffer,0,NB*16);

		if ( inc_x == 2 )
		{

			for( i = 0; i < n1 ; i++)
			{
				zgemv_kernel_4x4(NB,ap,x_ptr,ybuffer);
				ap[0] += lda4;
				ap[1] += lda4;
				ap[2] += lda4;
				ap[3] += lda4;
				a_ptr += lda4;
				x_ptr += 8;	
			}

			if ( n2 & 2 )
			{
				zgemv_kernel_4x2(NB,ap,x_ptr,ybuffer);
				x_ptr += 4;	
				a_ptr += 2 * lda;

			}

			if ( n2 & 1 )
			{
				zgemv_kernel_4x1(NB,a_ptr,x_ptr,ybuffer);
				x_ptr += 2;	
				a_ptr += lda;

			}
		}
		else
		{

			for( i = 0; i < n1 ; i++)
			{

				xbuffer[0] = x_ptr[0];
				xbuffer[1] = x_ptr[1];
				x_ptr += inc_x;	
				xbuffer[2] = x_ptr[0];
				xbuffer[3] = x_ptr[1];
				x_ptr += inc_x;	
				xbuffer[4] = x_ptr[0];
				xbuffer[5] = x_ptr[1];
				x_ptr += inc_x;	
				xbuffer[6] = x_ptr[0];
				xbuffer[7] = x_ptr[1];
				x_ptr += inc_x;	

				zgemv_kernel_4x4(NB,ap,xbuffer,ybuffer);
				ap[0] += lda4;
				ap[1] += lda4;
				ap[2] += lda4;
				ap[3] += lda4;
				a_ptr += lda4;
			}

			for( i = 0; i < n2 ; i++)
			{
				xbuffer[0] = x_ptr[0];
				xbuffer[1] = x_ptr[1];
				x_ptr += inc_x;	
				zgemv_kernel_4x1(NB,a_ptr,xbuffer,ybuffer);
				a_ptr += 1 * lda;

			}

		}

		add_y(NB,ybuffer,y_ptr,inc_y,alpha_r,alpha_i);
		a     += 2 * NB;
		y_ptr += NB * inc_y;
	}

	if ( m3 == 0 ) return(0);

	if ( m3 == 1 )
	{
		a_ptr = a;
		x_ptr = x;
		FLOAT temp_r = 0.0;
		FLOAT temp_i = 0.0;

		if ( lda == 2 && inc_x == 2 )
		{


			for( i=0 ; i < (n & -2); i+=2 )
			{
#if ( !defined(CONJ) && !defined(XCONJ) ) || ( defined(CONJ) && defined(XCONJ) )
				temp_r += a_ptr[0] * x_ptr[0] - a_ptr[1] * x_ptr[1];
				temp_i += a_ptr[0] * x_ptr[1] + a_ptr[1] * x_ptr[0];
				temp_r += a_ptr[2] * x_ptr[2] - a_ptr[3] * x_ptr[3];
				temp_i += a_ptr[2] * x_ptr[3] + a_ptr[3] * x_ptr[2];
#else
				temp_r += a_ptr[0] * x_ptr[0] + a_ptr[1] * x_ptr[1];
				temp_i += a_ptr[0] * x_ptr[1] - a_ptr[1] * x_ptr[0];
				temp_r += a_ptr[2] * x_ptr[2] + a_ptr[3] * x_ptr[3];
				temp_i += a_ptr[2] * x_ptr[3] - a_ptr[3] * x_ptr[2];
#endif

				a_ptr += 4;
				x_ptr += 4;
			}



			for( ; i < n; i++ )
			{
#if ( !defined(CONJ) && !defined(XCONJ) ) || ( defined(CONJ) && defined(XCONJ) )
				temp_r += a_ptr[0] * x_ptr[0] - a_ptr[1] * x_ptr[1];
				temp_i += a_ptr[0] * x_ptr[1] + a_ptr[1] * x_ptr[0];
#else
				temp_r += a_ptr[0] * x_ptr[0] + a_ptr[1] * x_ptr[1];
				temp_i += a_ptr[0] * x_ptr[1] - a_ptr[1] * x_ptr[0];
#endif

				a_ptr += 2;
				x_ptr += 2;
			}


		}
		else
		{

			for( i = 0; i < n; i++ )
			{
#if ( !defined(CONJ) && !defined(XCONJ) ) || ( defined(CONJ) && defined(XCONJ) )
				temp_r += a_ptr[0] * x_ptr[0] - a_ptr[1] * x_ptr[1];
				temp_i += a_ptr[0] * x_ptr[1] + a_ptr[1] * x_ptr[0];
#else
				temp_r += a_ptr[0] * x_ptr[0] + a_ptr[1] * x_ptr[1];
				temp_i += a_ptr[0] * x_ptr[1] - a_ptr[1] * x_ptr[0];
#endif

				a_ptr += lda;
				x_ptr += inc_x;
			}

		}
#if !defined(XCONJ) 
		y_ptr[0] += alpha_r * temp_r - alpha_i * temp_i;
		y_ptr[1] += alpha_r * temp_i + alpha_i * temp_r;
#else
		y_ptr[0] += alpha_r * temp_r + alpha_i * temp_i;
		y_ptr[1] -= alpha_r * temp_i - alpha_i * temp_r;
#endif
		return(0);
	}

	if ( m3 == 2 )
	{
		a_ptr = a;
		x_ptr = x;
		FLOAT temp_r0 = 0.0;
		FLOAT temp_i0 = 0.0;
		FLOAT temp_r1 = 0.0;
		FLOAT temp_i1 = 0.0;

		if ( lda == 4 && inc_x == 2 )
		{

			for( i = 0; i < (n & -2); i+=2 )
			{
#if ( !defined(CONJ) && !defined(XCONJ) ) || ( defined(CONJ) && defined(XCONJ) )

				temp_r0 += a_ptr[0] * x_ptr[0] - a_ptr[1] * x_ptr[1];
				temp_i0 += a_ptr[0] * x_ptr[1] + a_ptr[1] * x_ptr[0];
				temp_r1 += a_ptr[2] * x_ptr[0] - a_ptr[3] * x_ptr[1];
				temp_i1 += a_ptr[2] * x_ptr[1] + a_ptr[3] * x_ptr[0];

				temp_r0 += a_ptr[4] * x_ptr[2] - a_ptr[5] * x_ptr[3];
				temp_i0 += a_ptr[4] * x_ptr[3] + a_ptr[5] * x_ptr[2];
				temp_r1 += a_ptr[6] * x_ptr[2] - a_ptr[7] * x_ptr[3];
				temp_i1 += a_ptr[6] * x_ptr[3] + a_ptr[7] * x_ptr[2];

#else
				temp_r0 += a_ptr[0] * x_ptr[0] + a_ptr[1] * x_ptr[1];
				temp_i0 += a_ptr[0] * x_ptr[1] - a_ptr[1] * x_ptr[0];
				temp_r1 += a_ptr[2] * x_ptr[0] + a_ptr[3] * x_ptr[1];
				temp_i1 += a_ptr[2] * x_ptr[1] - a_ptr[3] * x_ptr[0];

				temp_r0 += a_ptr[4] * x_ptr[2] + a_ptr[5] * x_ptr[3];
				temp_i0 += a_ptr[4] * x_ptr[3] - a_ptr[5] * x_ptr[2];
				temp_r1 += a_ptr[6] * x_ptr[2] + a_ptr[7] * x_ptr[3];
				temp_i1 += a_ptr[6] * x_ptr[3] - a_ptr[7] * x_ptr[2];

#endif

				a_ptr += 8;
				x_ptr += 4;
			}


			for( ; i < n; i++ )
			{
#if ( !defined(CONJ) && !defined(XCONJ) ) || ( defined(CONJ) && defined(XCONJ) )
				temp_r0 += a_ptr[0] * x_ptr[0] - a_ptr[1] * x_ptr[1];
				temp_i0 += a_ptr[0] * x_ptr[1] + a_ptr[1] * x_ptr[0];
				temp_r1 += a_ptr[2] * x_ptr[0] - a_ptr[3] * x_ptr[1];
				temp_i1 += a_ptr[2] * x_ptr[1] + a_ptr[3] * x_ptr[0];
#else
				temp_r0 += a_ptr[0] * x_ptr[0] + a_ptr[1] * x_ptr[1];
				temp_i0 += a_ptr[0] * x_ptr[1] - a_ptr[1] * x_ptr[0];
				temp_r1 += a_ptr[2] * x_ptr[0] + a_ptr[3] * x_ptr[1];
				temp_i1 += a_ptr[2] * x_ptr[1] - a_ptr[3] * x_ptr[0];
#endif

				a_ptr += 4;
				x_ptr += 2;
			}


		}
		else
		{

			for( i=0 ; i < n; i++ )
			{
#if ( !defined(CONJ) && !defined(XCONJ) ) || ( defined(CONJ) && defined(XCONJ) )
				temp_r0 += a_ptr[0] * x_ptr[0] - a_ptr[1] * x_ptr[1];
				temp_i0 += a_ptr[0] * x_ptr[1] + a_ptr[1] * x_ptr[0];
				temp_r1 += a_ptr[2] * x_ptr[0] - a_ptr[3] * x_ptr[1];
				temp_i1 += a_ptr[2] * x_ptr[1] + a_ptr[3] * x_ptr[0];
#else
				temp_r0 += a_ptr[0] * x_ptr[0] + a_ptr[1] * x_ptr[1];
				temp_i0 += a_ptr[0] * x_ptr[1] - a_ptr[1] * x_ptr[0];
				temp_r1 += a_ptr[2] * x_ptr[0] + a_ptr[3] * x_ptr[1];
				temp_i1 += a_ptr[2] * x_ptr[1] - a_ptr[3] * x_ptr[0];
#endif

				a_ptr += lda;
				x_ptr += inc_x;
			}


		}
#if !defined(XCONJ) 
		y_ptr[0] += alpha_r * temp_r0 - alpha_i * temp_i0;
		y_ptr[1] += alpha_r * temp_i0 + alpha_i * temp_r0;
		y_ptr    += inc_y;
		y_ptr[0] += alpha_r * temp_r1 - alpha_i * temp_i1;
		y_ptr[1] += alpha_r * temp_i1 + alpha_i * temp_r1;
#else
		y_ptr[0] += alpha_r * temp_r0 + alpha_i * temp_i0;
		y_ptr[1] -= alpha_r * temp_i0 - alpha_i * temp_r0;
		y_ptr    += inc_y;
		y_ptr[0] += alpha_r * temp_r1 + alpha_i * temp_i1;
		y_ptr[1] -= alpha_r * temp_i1 - alpha_i * temp_r1;
#endif
		return(0);
	}


	if ( m3 == 3 )
	{
		a_ptr = a;
		x_ptr = x;
		FLOAT temp_r0 = 0.0;
		FLOAT temp_i0 = 0.0;
		FLOAT temp_r1 = 0.0;
		FLOAT temp_i1 = 0.0;
		FLOAT temp_r2 = 0.0;
		FLOAT temp_i2 = 0.0;

		if ( lda == 6 && inc_x == 2 )
		{

			for( i=0 ; i < n; i++ )
			{
#if ( !defined(CONJ) && !defined(XCONJ) ) || ( defined(CONJ) && defined(XCONJ) )
				temp_r0 += a_ptr[0] * x_ptr[0] - a_ptr[1] * x_ptr[1];
				temp_i0 += a_ptr[0] * x_ptr[1] + a_ptr[1] * x_ptr[0];
				temp_r1 += a_ptr[2] * x_ptr[0] - a_ptr[3] * x_ptr[1];
				temp_i1 += a_ptr[2] * x_ptr[1] + a_ptr[3] * x_ptr[0];
				temp_r2 += a_ptr[4] * x_ptr[0] - a_ptr[5] * x_ptr[1];
				temp_i2 += a_ptr[4] * x_ptr[1] + a_ptr[5] * x_ptr[0];
#else
				temp_r0 += a_ptr[0] * x_ptr[0] + a_ptr[1] * x_ptr[1];
				temp_i0 += a_ptr[0] * x_ptr[1] - a_ptr[1] * x_ptr[0];
				temp_r1 += a_ptr[2] * x_ptr[0] + a_ptr[3] * x_ptr[1];
				temp_i1 += a_ptr[2] * x_ptr[1] - a_ptr[3] * x_ptr[0];
				temp_r2 += a_ptr[4] * x_ptr[0] + a_ptr[5] * x_ptr[1];
				temp_i2 += a_ptr[4] * x_ptr[1] - a_ptr[5] * x_ptr[0];
#endif

				a_ptr += 6;
				x_ptr += 2;
			}


		}
		else
		{

			for( i = 0; i < n; i++ )
			{
#if ( !defined(CONJ) && !defined(XCONJ) ) || ( defined(CONJ) && defined(XCONJ) )
				temp_r0 += a_ptr[0] * x_ptr[0] - a_ptr[1] * x_ptr[1];
				temp_i0 += a_ptr[0] * x_ptr[1] + a_ptr[1] * x_ptr[0];
				temp_r1 += a_ptr[2] * x_ptr[0] - a_ptr[3] * x_ptr[1];
				temp_i1 += a_ptr[2] * x_ptr[1] + a_ptr[3] * x_ptr[0];
				temp_r2 += a_ptr[4] * x_ptr[0] - a_ptr[5] * x_ptr[1];
				temp_i2 += a_ptr[4] * x_ptr[1] + a_ptr[5] * x_ptr[0];
#else
				temp_r0 += a_ptr[0] * x_ptr[0] + a_ptr[1] * x_ptr[1];
				temp_i0 += a_ptr[0] * x_ptr[1] - a_ptr[1] * x_ptr[0];
				temp_r1 += a_ptr[2] * x_ptr[0] + a_ptr[3] * x_ptr[1];
				temp_i1 += a_ptr[2] * x_ptr[1] - a_ptr[3] * x_ptr[0];
				temp_r2 += a_ptr[4] * x_ptr[0] + a_ptr[5] * x_ptr[1];
				temp_i2 += a_ptr[4] * x_ptr[1] - a_ptr[5] * x_ptr[0];
#endif

				a_ptr += lda;
				x_ptr += inc_x;
			}

		}
#if !defined(XCONJ) 
		y_ptr[0] += alpha_r * temp_r0 - alpha_i * temp_i0;
		y_ptr[1] += alpha_r * temp_i0 + alpha_i * temp_r0;
		y_ptr    += inc_y;
		y_ptr[0] += alpha_r * temp_r1 - alpha_i * temp_i1;
		y_ptr[1] += alpha_r * temp_i1 + alpha_i * temp_r1;
		y_ptr    += inc_y;
		y_ptr[0] += alpha_r * temp_r2 - alpha_i * temp_i2;
		y_ptr[1] += alpha_r * temp_i2 + alpha_i * temp_r2;
#else
		y_ptr[0] += alpha_r * temp_r0 + alpha_i * temp_i0;
		y_ptr[1] -= alpha_r * temp_i0 - alpha_i * temp_r0;
		y_ptr    += inc_y;
		y_ptr[0] += alpha_r * temp_r1 + alpha_i * temp_i1;
		y_ptr[1] -= alpha_r * temp_i1 - alpha_i * temp_r1;
		y_ptr    += inc_y;
		y_ptr[0] += alpha_r * temp_r2 + alpha_i * temp_i2;
		y_ptr[1] -= alpha_r * temp_i2 - alpha_i * temp_r2;
#endif
		return(0);
	}





	return(0);
}


