From c6b0de2c21c921e1c1cca4978d4e9d6e18559a15 Mon Sep 17 00:00:00 2001
From: Benoit Steiner <benoit.steiner.goog@gmail.com>
Date: Fri, 22 Jul 2016 17:18:20 -0700
Subject: Improved partial reductions in more cases

---
 unsupported/test/cxx11_tensor_reduction.cpp | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

(limited to 'unsupported/test/cxx11_tensor_reduction.cpp')

diff --git a/unsupported/test/cxx11_tensor_reduction.cpp b/unsupported/test/cxx11_tensor_reduction.cpp
index ca483257b..1490ec3da 100644
--- a/unsupported/test/cxx11_tensor_reduction.cpp
+++ b/unsupported/test/cxx11_tensor_reduction.cpp
@@ -239,6 +239,33 @@ static void test_simple_reductions() {
   }
 }
 
+
+template <int DataLayout>
+static void test_reductions_in_expr() {
+  Tensor<float, 4, DataLayout> tensor(2, 3, 5, 7);
+  tensor.setRandom();
+  array<ptrdiff_t, 2> reduction_axis2;
+  reduction_axis2[0] = 1;
+  reduction_axis2[1] = 3;
+
+  Tensor<float, 2, DataLayout> result(2, 5);
+  result = result.constant(1.0f) - tensor.sum(reduction_axis2);
+  VERIFY_IS_EQUAL(result.dimension(0), 2);
+  VERIFY_IS_EQUAL(result.dimension(1), 5);
+  for (int i = 0; i < 2; ++i) {
+    for (int j = 0; j < 5; ++j) {
+      float sum = 0.0f;
+      for (int k = 0; k < 3; ++k) {
+        for (int l = 0; l < 7; ++l) {
+          sum += tensor(i, k, j, l);
+        }
+      }
+      VERIFY_IS_APPROX(result(i, j), 1.0f - sum);
+    }
+  }
+}
+
+
 template <int DataLayout>
 static void test_full_reductions() {
   Tensor<float, 2, DataLayout> tensor(2, 3);
@@ -462,6 +489,8 @@ void test_cxx11_tensor_reduction() {
   CALL_SUBTEST(test_trivial_reductions<RowMajor>());
   CALL_SUBTEST(test_simple_reductions<ColMajor>());
   CALL_SUBTEST(test_simple_reductions<RowMajor>());
+  CALL_SUBTEST(test_reductions_in_expr<ColMajor>());
+  CALL_SUBTEST(test_reductions_in_expr<RowMajor>());
   CALL_SUBTEST(test_full_reductions<ColMajor>());
   CALL_SUBTEST(test_full_reductions<RowMajor>());
   CALL_SUBTEST(test_user_defined_reductions<ColMajor>());
-- 
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