From aa54fe064c1056e4f87266d1d64f10c51d9558a9 Mon Sep 17 00:00:00 2001
From: wernsaar <wernsaar@googlemail.com>
Date: Thu, 7 Aug 2014 22:30:20 +0200
Subject: [PATCH] added zgemv_n c-function

---
 kernel/x86_64/zgemv_n.c | 302 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 302 insertions(+)
 create mode 100644 kernel/x86_64/zgemv_n.c

diff --git a/kernel/x86_64/zgemv_n.c b/kernel/x86_64/zgemv_n.c
new file mode 100644
index 0000000..be5b08d
--- /dev/null
+++ b/kernel/x86_64/zgemv_n.c
@@ -0,0 +1,302 @@
+/***************************************************************************
+Copyright (c) 2014, The OpenBLAS Project
+All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+1. Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in
+the documentation and/or other materials provided with the
+distribution.
+3. Neither the name of the OpenBLAS project nor the names of
+its contributors may be used to endorse or promote products
+derived from this software without specific prior written permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBLAS PROJECT OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*****************************************************************************/
+
+
+#include "common.h"
+
+
+#define NBMAX 1024
+
+#ifndef HAVE_KERNEL_16x4
+
+static void zgemv_kernel_16x4(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) 
+#if !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
+#else
+#if !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
+	}
+}
+	
+#endif
+
+static void zgemv_kernel_16x1(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) 
+#if !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
+#else
+#if !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
+
+	}
+}
+	
+
+static void zero_y(BLASLONG n, FLOAT *dest)
+{
+	BLASLONG i;
+	for ( i=0; i<2*n; i++ )
+	{
+		*dest = 0.0;
+		dest++;
+	}
+}
+
+
+
+static void add_y(BLASLONG n, FLOAT *src, FLOAT *dest, BLASLONG inc_dest)
+{
+	BLASLONG i;
+	for ( i=0; i<n; i++ )
+	{
+		*dest += *src;
+#if ( !defined(CONJ) && !defined(XCONJ) ) || ( defined(CONJ) && defined(XCONJ) )
+		*(dest+1) += *(src+1);
+#else
+		*(dest+1) -= *(src+1);
+#endif
+		src+=2;
+		dest += inc_dest;
+	}
+}
+
+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 n2;
+	FLOAT xbuffer[8],*ybuffer;
+
+	ybuffer = buffer;
+	
+	inc_x *= 2;
+	inc_y *= 2;
+	lda   *= 2;
+
+	n1 = n / 4 ;
+	n2 = n % 4 ;
+	
+	m1 = m - ( m % 16 );
+	m2 = (m % NBMAX) - (m % 16) ;
+	
+	y_ptr = y;
+
+	BLASLONG NB = NBMAX;
+
+	while ( NB == NBMAX )
+	{
+		
+		m1 -= NB;
+		if ( m1 < 0)
+		{
+			if ( m2 == 0 ) break;	
+			NB = m2;
+		}
+		
+		a_ptr = a;
+		x_ptr = x;
+		zero_y(NB,ybuffer);
+		for( i = 0; i < n1 ; i++)
+		{
+
+#if !defined(XCONJ)
+			xbuffer[0] = alpha_r * x_ptr[0] - alpha_i * x_ptr[1];
+			xbuffer[1] = alpha_r * x_ptr[1] + alpha_i * x_ptr[0];
+			x_ptr += inc_x;	
+			xbuffer[2] = alpha_r * x_ptr[0] - alpha_i * x_ptr[1];
+			xbuffer[3] = alpha_r * x_ptr[1] + alpha_i * x_ptr[0];
+			x_ptr += inc_x;	
+			xbuffer[4] = alpha_r * x_ptr[0] - alpha_i * x_ptr[1];
+			xbuffer[5] = alpha_r * x_ptr[1] + alpha_i * x_ptr[0];
+			x_ptr += inc_x;	
+			xbuffer[6] = alpha_r * x_ptr[0] - alpha_i * x_ptr[1];
+			xbuffer[7] = alpha_r * x_ptr[1] + alpha_i * x_ptr[0];
+			x_ptr += inc_x;	
+#else
+			xbuffer[0] = alpha_r * x_ptr[0] + alpha_i * x_ptr[1];
+			xbuffer[1] = alpha_r * x_ptr[1] - alpha_i * x_ptr[0];
+			x_ptr += inc_x;	
+			xbuffer[2] = alpha_r * x_ptr[0] + alpha_i * x_ptr[1];
+			xbuffer[3] = alpha_r * x_ptr[1] - alpha_i * x_ptr[0];
+			x_ptr += inc_x;	
+			xbuffer[4] = alpha_r * x_ptr[0] + alpha_i * x_ptr[1];
+			xbuffer[5] = alpha_r * x_ptr[1] - alpha_i * x_ptr[0];
+			x_ptr += inc_x;	
+			xbuffer[6] = alpha_r * x_ptr[0] + alpha_i * x_ptr[1];
+			xbuffer[7] = alpha_r * x_ptr[1] - alpha_i * x_ptr[0];
+			x_ptr += inc_x;	
+#endif
+
+			ap[0] = a_ptr;
+			ap[1] = a_ptr + lda;
+			ap[2] = ap[1] + lda;
+			ap[3] = ap[2] + lda;
+			zgemv_kernel_16x4(NB,ap,xbuffer,ybuffer);
+			a_ptr += 4 * lda;
+		}
+
+		for( i = 0; i < n2 ; i++)
+		{
+#if !defined(XCONJ)
+			xbuffer[0] = alpha_r * x_ptr[0] - alpha_i * x_ptr[1];
+			xbuffer[1] = alpha_r * x_ptr[1] + alpha_i * x_ptr[0];
+			x_ptr += inc_x;	
+#else
+			xbuffer[0] = alpha_r * x_ptr[0] + alpha_i * x_ptr[1];
+			xbuffer[1] = alpha_r * x_ptr[1] - alpha_i * x_ptr[0];
+			x_ptr += inc_x;	
+#endif
+
+			zgemv_kernel_16x1(NB,a_ptr,xbuffer,ybuffer);
+			a_ptr += 1 * lda;
+
+		}
+		add_y(NB,ybuffer,y_ptr,inc_y);
+		a     += 2 * NB;
+		y_ptr += NB * inc_y;
+	}
+	j=0;
+	while ( j < (m % 16))
+	{
+		a_ptr = a;
+		x_ptr = x;
+		FLOAT temp_r = 0.0;
+		FLOAT temp_i = 0.0;
+		for( i = 0; i < n; i++ )
+		{
+#if  !defined(CONJ)
+#if  !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
+#else
+#if  !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
+#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
+		y_ptr += inc_y;
+		a+=2;
+		j++;
+	}
+	return(0);
+}
+
+
-- 
2.7.4