From bec72345d69917f475e577d23df0ca4ed967a4f0 Mon Sep 17 00:00:00 2001
From: Rasmus Munk Larsen <rmlarsen@google.com>
Date: Thu, 12 Nov 2020 23:43:15 +0000
Subject: [PATCH] Simplify expression for inner product fallback in Gemv
 product evaluator.

---
 Eigen/src/Core/ProductEvaluators.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Eigen/src/Core/ProductEvaluators.h b/Eigen/src/Core/ProductEvaluators.h
index 6b32c508b..6e220d736 100644
--- a/Eigen/src/Core/ProductEvaluators.h
+++ b/Eigen/src/Core/ProductEvaluators.h
@@ -377,7 +377,7 @@ struct generic_product_impl<Lhs,Rhs,DenseShape,DenseShape,GemvProduct>
   {
     // Fallback to inner product if both the lhs and rhs is a runtime vector.
     if (lhs.rows() == 1 && rhs.cols() == 1) {
-      dst.coeffRef(0,0) += alpha * (lhs.row(0).transpose().cwiseProduct(rhs.col(0)).sum());
+      dst.coeffRef(0,0) += alpha * lhs.row(0).conjugate().dot(rhs.col(0));
       return;
     } 
     LhsNested actual_lhs(lhs);