diff --git a/Eigen/src/Core/products/GeneralBlockPanelKernel.h b/Eigen/src/Core/products/GeneralBlockPanelKernel.h
index 94754bf66..229e96ceb 100644
--- a/Eigen/src/Core/products/GeneralBlockPanelKernel.h
+++ b/Eigen/src/Core/products/GeneralBlockPanelKernel.h
@@ -203,8 +203,6 @@ void evaluateProductBlockingSizesHeuristic(Index& k, Index& m, Index& n, Index n
     const Index actual_l2 = 1572864; // == 1.5 MB
     #endif
     
-    
-    
     // Here, nc is chosen such that a block of kc x nc of the rhs fit within half of L2.
     // The second half is implicitly reserved to access the result and lhs coefficients.
     // When k<max_kc, then nc can arbitrarily growth. In practice, it seems to be fruitful
diff --git a/blas/level3_impl.h b/blas/level3_impl.h
index 563101dfc..6a6b00728 100644
--- a/blas/level3_impl.h
+++ b/blas/level3_impl.h
@@ -6,7 +6,7 @@
 // This Source Code Form is subject to the terms of the Mozilla
 // Public License v. 2.0. If a copy of the MPL was not distributed
 // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
+#include <iostream>
 #include "common.h"
 
 int EIGEN_BLAS_FUNC(gemm)(char *opa, char *opb, int *m, int *n, int *k, RealScalar *palpha, RealScalar *pa, int *lda, RealScalar *pb, int *ldb, RealScalar *pbeta, RealScalar *pc, int *ldc)
@@ -133,6 +133,9 @@ int EIGEN_BLAS_FUNC(trsm)(char *side, char *uplo, char *opa, char *diag, int *m,
   if(info)
     return xerbla_(SCALAR_SUFFIX_UP"TRSM ",&info,6);
 
+  if(*m==0 || *n==0)
+    return 0;
+
   int code = OP(*opa) | (SIDE(*side) << 2) | (UPLO(*uplo) << 3) | (DIAG(*diag) << 4);
   
   if(SIDE(*side)==LEFT)
@@ -358,6 +361,9 @@ int EIGEN_BLAS_FUNC(syrk)(char *uplo, char *op, int *n, int *k, RealScalar *palp
       else                matrix(c, *n, *n, *ldc).triangularView<Lower>() *= beta;
   }
 
+  if(*n==0 || *k==0)
+    return 0;
+
   #if ISCOMPLEX
   // FIXME add support for symmetric complex matrix
   if(UPLO(*uplo)==UP)
@@ -392,6 +398,8 @@ int EIGEN_BLAS_FUNC(syr2k)(char *uplo, char *op, int *n, int *k, RealScalar *pal
   Scalar alpha = *reinterpret_cast<Scalar*>(palpha);
   Scalar beta  = *reinterpret_cast<Scalar*>(pbeta);
 
+//   std::cerr << "in syr2k " << *uplo << " " << *op << " " << *n << " " << *k << " " << alpha << " " << *lda << " " << *ldb << " " << beta << " " << *ldc << "\n";
+
   int info = 0;
   if(UPLO(*uplo)==INVALID)                                            info = 1;
   else if(OP(*op)==INVALID)                                           info = 2;
@@ -506,6 +514,8 @@ int EIGEN_BLAS_FUNC(hemm)(char *side, char *uplo, int *m, int *n, RealScalar *pa
 // c = alpha*conj(a')*a + beta*c  for op  = 'C'or'c'
 int EIGEN_BLAS_FUNC(herk)(char *uplo, char *op, int *n, int *k, RealScalar *palpha, RealScalar *pa, int *lda, RealScalar *pbeta, RealScalar *pc, int *ldc)
 {
+//   std::cerr << "in herk " << *uplo << " " << *op << " " << *n << " " << *k << " " << *palpha << " " << *lda << " " << *pbeta << " " << *ldc << "\n";
+
   typedef void (*functype)(DenseIndex, DenseIndex, const Scalar *, DenseIndex, const Scalar *, DenseIndex, Scalar *, DenseIndex, const Scalar&);
   static functype func[8];
 
@@ -577,6 +587,8 @@ int EIGEN_BLAS_FUNC(her2k)(char *uplo, char *op, int *n, int *k, RealScalar *pal
   Scalar alpha = *reinterpret_cast<Scalar*>(palpha);
   RealScalar beta  = *pbeta;
 
+//   std::cerr << "in her2k " << *uplo << " " << *op << " " << *n << " " << *k << " " << alpha << " " << *lda << " " << *ldb << " " << beta << " " << *ldc << "\n";
+
   int info = 0;
   if(UPLO(*uplo)==INVALID)                                            info = 1;
   else if((OP(*op)==INVALID) || (OP(*op)==TR))                        info = 2;