[GitHub] [arrow] jianxind commented on a change in pull request #7029: ARROW-8579 [C++] SIMD for spaced decoding and encoding.

[GitBox <gi...@apache.org>]

jianxind commented on a change in pull request #7029:
URL: https://github.com/apache/arrow/pull/7029#discussion_r420610538



##########
File path: cpp/src/arrow/util/spaced.h
##########
@@ -0,0 +1,266 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#pragma once
+
+#include "arrow/util/bit_util.h"
+
+#ifdef ARROW_HAVE_AVX512
+#include <immintrin.h>
+#endif  // ARROW_HAVE_AVX512
+
+namespace arrow {
+namespace util {
+namespace internal {
+
+template <typename T>
+int PutSpacedScalar(const T* values, int num_values, const uint8_t* valid_bits,

Review comment:
       SSE epi8/epi32/epi64 added.




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