1 files changed, 61 insertions, 6 deletions

diff --git a/unsupported/test/cxx11_tensor_shuffling.cpp b/unsupported/test/cxx11_tensor_shuffling.cpp
index d11444a14..89a64c021 100644
--- a/unsupported/test/cxx11_tensor_shuffling.cpp
+++ b/unsupported/test/cxx11_tensor_shuffling.cpp
@@ -81,12 +81,12 @@ static void test_expr_shuffling()
   Tensor<float, 4, DataLayout> expected;
   expected = tensor.shuffle(shuffles);
 
-  Tensor<float, 4, DataLayout> result(5,7,3,2);
+  Tensor<float, 4, DataLayout> result(5, 7, 3, 2);
 
-  array<int, 4> src_slice_dim{{2,3,1,7}};
-  array<int, 4> src_slice_start{{0,0,0,0}};
-  array<int, 4> dst_slice_dim{{1,7,3,2}};
-  array<int, 4> dst_slice_start{{0,0,0,0}};
+  array<ptrdiff_t, 4> src_slice_dim{{2, 3, 1, 7}};
+  array<ptrdiff_t, 4> src_slice_start{{0, 0, 0, 0}};
+  array<ptrdiff_t, 4> dst_slice_dim{{1, 7, 3, 2}};
+  array<ptrdiff_t, 4> dst_slice_start{{0, 0, 0, 0}};
 
   for (int i = 0; i < 5; ++i) {
     result.slice(dst_slice_start, dst_slice_dim) =
@@ -215,7 +215,60 @@ static void test_shuffle_unshuffle()
 }
 
 
-void test_cxx11_tensor_shuffling()
+template <int DataLayout>
+static void test_empty_shuffling()
+{
+  Tensor<float, 4, DataLayout> tensor(2,3,0,7);
+  tensor.setRandom();
+  array<ptrdiff_t, 4> shuffles;
+  shuffles[0] = 0;
+  shuffles[1] = 1;
+  shuffles[2] = 2;
+  shuffles[3] = 3;
+
+  Tensor<float, 4, DataLayout> no_shuffle;
+  no_shuffle = tensor.shuffle(shuffles);
+
+  VERIFY_IS_EQUAL(no_shuffle.dimension(0), 2);
+  VERIFY_IS_EQUAL(no_shuffle.dimension(1), 3);
+  VERIFY_IS_EQUAL(no_shuffle.dimension(2), 0);
+  VERIFY_IS_EQUAL(no_shuffle.dimension(3), 7);
+
+  for (int i = 0; i < 2; ++i) {
+    for (int j = 0; j < 3; ++j) {
+      for (int k = 0; k < 0; ++k) {
+        for (int l = 0; l < 7; ++l) {
+          VERIFY_IS_EQUAL(tensor(i,j,k,l), no_shuffle(i,j,k,l));
+        }
+      }
+    }
+  }
+
+  shuffles[0] = 2;
+  shuffles[1] = 3;
+  shuffles[2] = 1;
+  shuffles[3] = 0;
+  Tensor<float, 4, DataLayout> shuffle;
+  shuffle = tensor.shuffle(shuffles);
+
+  VERIFY_IS_EQUAL(shuffle.dimension(0), 0);
+  VERIFY_IS_EQUAL(shuffle.dimension(1), 7);
+  VERIFY_IS_EQUAL(shuffle.dimension(2), 3);
+  VERIFY_IS_EQUAL(shuffle.dimension(3), 2);
+
+  for (int i = 0; i < 2; ++i) {
+    for (int j = 0; j < 3; ++j) {
+      for (int k = 0; k < 0; ++k) {
+        for (int l = 0; l < 7; ++l) {
+          VERIFY_IS_EQUAL(tensor(i,j,k,l), shuffle(k,l,j,i));
+        }
+      }
+    }
+  }
+}
+
+
+EIGEN_DECLARE_TEST(cxx11_tensor_shuffling)
 {
   CALL_SUBTEST(test_simple_shuffling<ColMajor>());
   CALL_SUBTEST(test_simple_shuffling<RowMajor>());
@@ -225,4 +278,6 @@ void test_cxx11_tensor_shuffling()
   CALL_SUBTEST(test_shuffling_as_value<RowMajor>());
   CALL_SUBTEST(test_shuffle_unshuffle<ColMajor>());
   CALL_SUBTEST(test_shuffle_unshuffle<RowMajor>());
+  CALL_SUBTEST(test_empty_shuffling<ColMajor>());
+  CALL_SUBTEST(test_empty_shuffling<RowMajor>());
 }