From b1f666d007ee4dc22f48dd65f900ee3659dd1f7d Mon Sep 17 00:00:00 2001
From: Benoit Jacob <jacob.benoit.1@gmail.com>
Date: Fri, 26 Feb 2010 20:12:51 -0500
Subject: Fix Map-with-Stride and cover it by new unit tests.

---
 test/mapstride.cpp | 139 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 test/mapstride.cpp

(limited to 'test/mapstride.cpp')

diff --git a/test/mapstride.cpp b/test/mapstride.cpp
new file mode 100644
index 000000000..7a1605681
--- /dev/null
+++ b/test/mapstride.cpp
@@ -0,0 +1,139 @@
+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2010 Benoit Jacob <jacob.benoit.1@gmail.com>
+//
+// Eigen is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 3 of the License, or (at your option) any later version.
+//
+// Alternatively, you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of
+// the License, or (at your option) any later version.
+//
+// Eigen is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License or the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License and a copy of the GNU General Public License along with
+// Eigen. If not, see <http://www.gnu.org/licenses/>.
+
+#include "main.h"
+
+template<typename VectorType> void map_class_vector(const VectorType& m)
+{
+  typedef typename VectorType::Scalar Scalar;
+
+  int size = m.size();
+
+  VectorType v = VectorType::Random(size);
+
+  int arraysize = 3*size;
+  
+  Scalar* array = ei_aligned_new<Scalar>(arraysize);
+
+  {
+    Map<VectorType, Aligned, InnerStride<3> > map(array, size);
+    map = v;
+    for(int i = 0; i < size; ++i)
+    {
+      VERIFY(array[3*i] == v[i]);
+      VERIFY(map[i] == v[i]);
+    }
+  }
+
+  {
+    Map<VectorType, Unaligned, InnerStride<Dynamic> > map(array, size, InnerStride<Dynamic>(2));
+    map = v;
+    for(int i = 0; i < size; ++i)
+    {
+      VERIFY(array[2*i] == v[i]);
+      VERIFY(map[i] == v[i]);
+    }
+  }
+
+  ei_aligned_delete(array, arraysize);
+}
+
+template<typename MatrixType> void map_class_matrix(const MatrixType& _m)
+{
+  typedef typename MatrixType::Scalar Scalar;
+
+  int rows = _m.rows(), cols = _m.cols();
+
+  MatrixType m = MatrixType::Random(rows,cols);
+
+  int arraysize = 2*(rows+4)*(cols+4);
+
+  Scalar* array = ei_aligned_new<Scalar>(arraysize);
+
+  // test no inner stride and some dynamic outer stride
+  {
+    Map<MatrixType, Aligned, OuterStride<Dynamic> > map(array, rows, cols, OuterStride<Dynamic>(m.innerSize()+1));
+    map = m;
+    VERIFY(map.outerStride() == map.innerSize()+1);
+    for(int i = 0; i < m.outerSize(); ++i)
+      for(int j = 0; j < m.innerSize(); ++j)
+      {
+        VERIFY(array[map.outerStride()*i+j] == m.coeffByOuterInner(i,j));
+        VERIFY(map.coeffByOuterInner(i,j) == m.coeffByOuterInner(i,j));
+      }
+  }
+
+  // test no inner stride and an outer stride of +4. This is quite important as for fixed-size matrices,
+  // this allows to hit the special case where it's vectorizable.
+  {
+    enum {
+      InnerSize = MatrixType::InnerSizeAtCompileTime,
+      OuterStrideAtCompileTime = InnerSize==Dynamic ? Dynamic : InnerSize+4
+    };
+    Map<MatrixType, Aligned, OuterStride<OuterStrideAtCompileTime> >
+      map(array, rows, cols, OuterStride<OuterStrideAtCompileTime>(m.innerSize()+4));
+    map = m;
+    VERIFY(map.outerStride() == map.innerSize()+4);
+    for(int i = 0; i < m.outerSize(); ++i)
+      for(int j = 0; j < m.innerSize(); ++j)
+      {
+        VERIFY(array[map.outerStride()*i+j] == m.coeffByOuterInner(i,j));
+        VERIFY(map.coeffByOuterInner(i,j) == m.coeffByOuterInner(i,j));
+      }
+  }
+
+  // test both inner stride and outer stride
+  {
+    Map<MatrixType, Aligned, Stride<Dynamic,Dynamic> > map(array, rows, cols, Stride<Dynamic,Dynamic>(2*m.innerSize()+1, 2));
+    map = m;
+    VERIFY(map.outerStride() == 2*map.innerSize()+1);
+    VERIFY(map.innerStride() == 2);
+    for(int i = 0; i < m.outerSize(); ++i)
+      for(int j = 0; j < m.innerSize(); ++j)
+      {
+        VERIFY(array[map.outerStride()*i+map.innerStride()*j] == m.coeffByOuterInner(i,j));
+        VERIFY(map.coeffByOuterInner(i,j) == m.coeffByOuterInner(i,j));
+      }
+  }
+
+  ei_aligned_delete(array, arraysize);
+}
+
+void test_mapstride()
+{
+  for(int i = 0; i < g_repeat; i++) {
+    CALL_SUBTEST_1( map_class_vector(Matrix<float, 1, 1>()) );
+    CALL_SUBTEST_2( map_class_vector(Vector4d()) );
+    CALL_SUBTEST_3( map_class_vector(RowVector4f()) );
+    CALL_SUBTEST_4( map_class_vector(VectorXcf(8)) );
+    CALL_SUBTEST_5( map_class_vector(VectorXi(12)) );
+
+    CALL_SUBTEST_1( map_class_matrix(Matrix<float, 1, 1>()) );
+    CALL_SUBTEST_2( map_class_matrix(Matrix4d()) );
+    CALL_SUBTEST_3( map_class_matrix(Matrix<float,3,5>()) );
+    CALL_SUBTEST_3( map_class_matrix(Matrix<float,4,8>()) );
+    CALL_SUBTEST_4( map_class_matrix(MatrixXcf(ei_random<int>(1,10),ei_random<int>(1,10))) );
+    CALL_SUBTEST_5( map_class_matrix(MatrixXi(5,5)));//ei_random<int>(1,10),ei_random<int>(1,10))) );
+  }
+}
-- 
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