From d5f215d88e52c3c7a45ad35411e3d8fc71ea89a5 Mon Sep 17 00:00:00 2001
From: Henning Baldersheim <balder@yahoo-inc.com>
Date: Thu, 21 Dec 2017 10:41:16 +0000
Subject: Use cheap and_modulator instead of prime modulator to avoid costly
 division.

---
 eval/src/vespa/eval/tensor/sparse/sparse_tensor.cpp | 3 ++-
 eval/src/vespa/eval/tensor/sparse/sparse_tensor.h   | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

(limited to 'eval')

diff --git a/eval/src/vespa/eval/tensor/sparse/sparse_tensor.cpp b/eval/src/vespa/eval/tensor/sparse/sparse_tensor.cpp
index b69b1cdab05..1f57e297ea1 100644
--- a/eval/src/vespa/eval/tensor/sparse/sparse_tensor.cpp
+++ b/eval/src/vespa/eval/tensor/sparse/sparse_tensor.cpp
@@ -188,4 +188,5 @@ SparseTensor::reduce(join_fun_t op,
 
 }
 
-VESPALIB_HASH_MAP_INSTANTIATE(vespalib::tensor::SparseTensorAddressRef, double);
+VESPALIB_HASH_MAP_INSTANTIATE_H_E_M(vespalib::tensor::SparseTensorAddressRef, double, vespalib::hash<vespalib::tensor::SparseTensorAddressRef>,
+        std::equal_to<vespalib::tensor::SparseTensorAddressRef>, vespalib::hashtable_base::and_modulator);
diff --git a/eval/src/vespa/eval/tensor/sparse/sparse_tensor.h b/eval/src/vespa/eval/tensor/sparse/sparse_tensor.h
index 2715e606729..3eeb122f48c 100644
--- a/eval/src/vespa/eval/tensor/sparse/sparse_tensor.h
+++ b/eval/src/vespa/eval/tensor/sparse/sparse_tensor.h
@@ -21,7 +21,8 @@ namespace vespalib::tensor {
 class SparseTensor : public Tensor
 {
 public:
-    using Cells = hash_map<SparseTensorAddressRef, double>;
+    using Cells = hash_map<SparseTensorAddressRef, double, hash<SparseTensorAddressRef>,
+            std::equal_to<SparseTensorAddressRef>, hashtable_base::and_modulator>;
 
     static constexpr size_t STASH_CHUNK_SIZE = 16384u;
 
-- 
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