From cfc70dc13f5842d0a20c464427af6776f0a4031e Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Wed, 12 Dec 2018 18:03:31 +0100
Subject: Add regression test for bug #1174

---
 test/eigensolver_generic.cpp | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'test/eigensolver_generic.cpp')

diff --git a/test/eigensolver_generic.cpp b/test/eigensolver_generic.cpp
index 086ecdf5e..cfb31e49e 100644
--- a/test/eigensolver_generic.cpp
+++ b/test/eigensolver_generic.cpp
@@ -184,6 +184,26 @@ void eigensolver_generic_extra()
     EigenSolver<MatrixXd> eig(A_bug1557);
     CALL_SUBTEST( check_eigensolver_for_given_mat(eig,A_bug1557) );
   }
+
+  // regression test for bug 1174
+  {
+    Index n = 12;
+    MatrixXf A_bug1174(n,n);
+    A_bug1174 <<  262144, 0, 0, 262144, 786432, 0, 0, 0, 0, 0, 0, 786432,
+                  262144, 0, 0, 262144, 786432, 0, 0, 0, 0, 0, 0, 786432,
+                  262144, 0, 0, 262144, 786432, 0, 0, 0, 0, 0, 0, 786432,
+                  262144, 0, 0, 262144, 786432, 0, 0, 0, 0, 0, 0, 786432,
+                  0, 262144, 262144, 0, 0, 262144, 262144, 262144, 262144, 262144, 262144, 0,
+                  0, 262144, 262144, 0, 0, 262144, 262144, 262144, 262144, 262144, 262144, 0,
+                  0, 262144, 262144, 0, 0, 262144, 262144, 262144, 262144, 262144, 262144, 0,
+                  0, 262144, 262144, 0, 0, 262144, 262144, 262144, 262144, 262144, 262144, 0,
+                  0, 262144, 262144, 0, 0, 262144, 262144, 262144, 262144, 262144, 262144, 0,
+                  0, 262144, 262144, 0, 0, 262144, 262144, 262144, 262144, 262144, 262144, 0,
+                  0, 262144, 262144, 0, 0, 262144, 262144, 262144, 262144, 262144, 262144, 0,
+                  0, 262144, 262144, 0, 0, 262144, 262144, 262144, 262144, 262144, 262144, 0;
+    EigenSolver<MatrixXf> eig(A_bug1174);
+    CALL_SUBTEST( check_eigensolver_for_given_mat(eig,A_bug1174) );
+  }
 }
 
 EIGEN_DECLARE_TEST(eigensolver_generic)
-- 
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