From 4e9c227bd52732a75b35f4c01da4e033c2f1e49a Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Thu, 17 Dec 2009 11:43:42 +0100
Subject: [PATCH] partial LU optimization: noalias

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

diff --git a/Eigen/src/LU/PartialPivLU.h b/Eigen/src/LU/PartialPivLU.h
index 6c9097db0..37cffd7a1 100644
--- a/Eigen/src/LU/PartialPivLU.h
+++ b/Eigen/src/LU/PartialPivLU.h
@@ -355,7 +355,7 @@ struct ei_partial_lu_impl
         // A12 = A11^-1 A12
         A11.template triangularView<UnitLowerTriangular>().solveInPlace(A12);
 
-        A22 -= A21 * A12;
+        A22.noalias() -= A21 * A12;
       }
     }
     return true;