diff --git a/kernel/x86_64/dgemv_n.c b/kernel/x86_64/dgemv_n.c
index 5192ba193..5d826dc63 100644
--- a/kernel/x86_64/dgemv_n.c
+++ b/kernel/x86_64/dgemv_n.c
@@ -125,6 +125,9 @@ int CNAME(BLASLONG m, BLASLONG n, BLASLONG dummy1, FLOAT alpha, FLOAT *a, BLASLO
 	BLASLONG n2;
 	FLOAT xbuffer[4],*ybuffer;
 
+        if ( m < 1 ) return(0);
+        if ( n < 1 ) return(0);
+
 	ybuffer = buffer;
 	
 	n1 = n / 4 ;
diff --git a/kernel/x86_64/dgemv_t.c b/kernel/x86_64/dgemv_t.c
index 76aacd349..0fa8378fe 100644
--- a/kernel/x86_64/dgemv_t.c
+++ b/kernel/x86_64/dgemv_t.c
@@ -104,6 +104,9 @@ int CNAME(BLASLONG m, BLASLONG n, BLASLONG dummy1, FLOAT alpha, FLOAT *a, BLASLO
 	BLASLONG n2;
 	FLOAT ybuffer[4],*xbuffer;
 
+        if ( m < 1 ) return(0);
+        if ( n < 1 ) return(0);
+
 	xbuffer = buffer;
 	
 	n1 = n / 4 ;
diff --git a/kernel/x86_64/sgemv_n.c b/kernel/x86_64/sgemv_n.c
index f2de1b76a..faa8e1f8c 100644
--- a/kernel/x86_64/sgemv_n.c
+++ b/kernel/x86_64/sgemv_n.c
@@ -131,6 +131,9 @@ int CNAME(BLASLONG m, BLASLONG n, BLASLONG dummy1, FLOAT alpha, FLOAT *a, BLASLO
 	BLASLONG n2;
 	FLOAT xbuffer[4],*ybuffer;
 
+        if ( m < 1 ) return(0);
+        if ( n < 1 ) return(0);
+
 	ybuffer = buffer;
 	
 	n1 = n / 4 ;
diff --git a/kernel/x86_64/sgemv_t.c b/kernel/x86_64/sgemv_t.c
index adfaa9925..532afee5d 100644
--- a/kernel/x86_64/sgemv_t.c
+++ b/kernel/x86_64/sgemv_t.c
@@ -110,6 +110,9 @@ int CNAME(BLASLONG m, BLASLONG n, BLASLONG dummy1, FLOAT alpha, FLOAT *a, BLASLO
 	BLASLONG n2;
 	FLOAT ybuffer[4],*xbuffer;
 
+        if ( m < 1 ) return(0);
+        if ( n < 1 ) return(0);
+
 	xbuffer = buffer;
 	
 	n1 = n / 4 ;
diff --git a/kernel/x86_64/zgemv_t.c b/kernel/x86_64/zgemv_t.c
index bb3f90420..9f5444a72 100644
--- a/kernel/x86_64/zgemv_t.c
+++ b/kernel/x86_64/zgemv_t.c
@@ -29,7 +29,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "common.h"
 
 
-#if defined(BULLDOZER)
+#if defined(BULLDOZER) || defined(PILEDRIVER)
 #include "zgemv_t_microk_bulldozer-2.c"
 #elif defined(HASWELL)
 #include "zgemv_t_microk_haswell-2.c"