From b079df9ef4536e89b4fb300062bebc7b7c540787 Mon Sep 17 00:00:00 2001
From: wernsaar <wernsaar@googlemail.com>
Date: Mon, 30 Jun 2014 14:46:38 +0200
Subject: [PATCH] added optimized sdot- and dsdot-kernel, written in C

---
 kernel/generic/dot.c | 104 +++++++++++++++++++++++++++++++++++++++++++++++++++
 kernel/x86_64/KERNEL |   6 +--
 2 files changed, 106 insertions(+), 4 deletions(-)
 create mode 100644 kernel/generic/dot.c

diff --git a/kernel/generic/dot.c b/kernel/generic/dot.c
new file mode 100644
index 0000000..bc07bc7
--- /dev/null
+++ b/kernel/generic/dot.c
@@ -0,0 +1,104 @@
+/***************************************************************************
+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"
+
+#if defined(DSDOT)
+double CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)
+#else
+FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)
+#endif
+{
+	BLASLONG i=0;
+	BLASLONG ix=0,iy=0;
+
+#if defined(DSDOT)
+	double dot = 0.0 ;
+#else
+	FLOAT  dot = 0.0 ;
+#endif
+
+	if ( n < 0 )  return(dot);
+
+	if ( (inc_x == 1) && (inc_y == 1) )
+	{
+
+		int n1 = n & -4;
+
+		while(i < n1)
+		{
+
+#if defined(DSDOT)
+			dot += (double) y[i] * (double) x[i]
+			    + (double) y[i+1] * (double) x[i+1]
+			    + (double) y[i+2] * (double) x[i+2]
+			    + (double) y[i+3] * (double) x[i+3] ;
+#else
+			dot += y[i] * x[i]
+			    + y[i+1] * x[i+1]
+			    + y[i+2] * x[i+2]
+			    + y[i+3] * x[i+3] ;
+#endif
+			i+=4 ;
+
+		}
+
+		while(i < n)
+		{
+
+#if defined(DSDOT)
+			dot += (double) y[i] * (double) x[i] ;
+#else
+			dot += y[i] * x[i] ;
+#endif
+			i++ ;
+
+		}
+		return(dot);
+
+
+	}
+
+	while(i < n)
+	{
+
+#if defined(DSDOT)
+		dot += (double) y[iy] * (double) x[ix] ;
+#else
+		dot += y[iy] * x[ix] ;
+#endif
+		ix  += inc_x ;
+		iy  += inc_y ;
+		i++ ;
+
+	}
+	return(dot);
+
+}
+
+
diff --git a/kernel/x86_64/KERNEL b/kernel/x86_64/KERNEL
index 9dd219c..ec21826 100644
--- a/kernel/x86_64/KERNEL
+++ b/kernel/x86_64/KERNEL
@@ -119,15 +119,13 @@ XCOPYKERNEL = zcopy.S
 endif
 
 ifndef SDOTKERNEL
-SDOTKERNEL = ../arm/dot.c
+SDOTKERNEL = ../generic/dot.c 
 endif
 
-
 ifndef DSDOTKERNEL
-DSDOTKERNEL = ../arm/dot.c 
+DSDOTKERNEL = ../generic/dot.c 
 endif
 
-
 ifndef DDOTKERNEL
 DDOTKERNEL =  dot_sse2.S
 endif
-- 
2.7.4