From c927af60edbf7dd859fc8057151e40b0fe2de661 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Wed, 30 Nov 2016 17:59:13 +0100
Subject: Fix a performance regression in (mat*mat)*vec for which mat*mat was
 evaluated multiple times.

---
 Eigen/src/Core/GeneralProduct.h | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'Eigen/src/Core/GeneralProduct.h')

diff --git a/Eigen/src/Core/GeneralProduct.h b/Eigen/src/Core/GeneralProduct.h
index 0cc2d08e2..8d87cab1f 100644
--- a/Eigen/src/Core/GeneralProduct.h
+++ b/Eigen/src/Core/GeneralProduct.h
@@ -329,6 +329,7 @@ template<> struct gemv_dense_selector<OnTheRight,ColMajor,false>
   template<typename Lhs, typename Rhs, typename Dest>
   static void run(const Lhs &lhs, const Rhs &rhs, Dest& dest, const typename Dest::Scalar& alpha)
   {
+    EIGEN_STATIC_ASSERT((!nested_eval<Lhs,1>::Evaluate),EIGEN_INTERNAL_COMPILATION_ERROR_OR_YOU_MADE_A_PROGRAMMING_MISTAKE);
     // TODO if rhs is large enough it might be beneficial to make sure that dest is sequentially stored in memory, otherwise use a temp
     typename nested_eval<Rhs,1>::type actual_rhs(rhs);
     const Index size = rhs.rows();
@@ -342,6 +343,7 @@ template<> struct gemv_dense_selector<OnTheRight,RowMajor,false>
   template<typename Lhs, typename Rhs, typename Dest>
   static void run(const Lhs &lhs, const Rhs &rhs, Dest& dest, const typename Dest::Scalar& alpha)
   {
+    EIGEN_STATIC_ASSERT((!nested_eval<Lhs,1>::Evaluate),EIGEN_INTERNAL_COMPILATION_ERROR_OR_YOU_MADE_A_PROGRAMMING_MISTAKE);
     typename nested_eval<Rhs,Lhs::RowsAtCompileTime>::type actual_rhs(rhs);
     const Index rows = dest.rows();
     for(Index i=0; i<rows; ++i)
-- 
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