diff -aruN eigen-eigen-10219c95fe65/Eigen/src/Core/products/GeneralMatrixVector.h eigen-eigen-10219c95fe65.N/Eigen/src/Core/products/GeneralMatrixVector.h
--- eigen-eigen-10219c95fe65/Eigen/src/Core/products/GeneralMatrixVector.h	2015-01-21 08:26:41.000000000 -0800
+++ eigen-eigen-10219c95fe65.N/Eigen/src/Core/products/GeneralMatrixVector.h	2015-05-28 12:00:13.193765171 -0700
@@ -52,7 +52,7 @@
   Index rows, Index cols,
   const LhsScalar* lhs, Index lhsStride,
   const RhsScalar* rhs, Index rhsIncr,
-  ResScalar* res, Index resIncr, RhsScalar alpha);
+  ResScalar* res, Index resIncr, RhsScalar alpha) nlATTRIBUTE_OPTIMIZE(nlOPTIMIZE_NONE);
 };
 
 template<typename Index, typename LhsScalar, bool ConjugateLhs, typename RhsScalar, bool ConjugateRhs, int Version>