Add SimdUtilBenchmark (facebookincubator#7735)

Summary: Pull Request resolved: facebookincubator#7735

Differential Revision: D51555528

velox/common/base/benchmarks/SimdUtilBenchmark.cpp

@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * Licensed 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.
+ */
+
+#include "velox/common/base/SimdUtil.h"
+
+#include <folly/Benchmark.h>
+#include <folly/init/Init.h>
+
+#include <random>
+
+namespace facebook::velox {
+namespace {
+
+#define VELOX_BENCHMARK(_type, _name, ...) \
+  _type _name(FOLLY_PP_STRINGIZE(_name), __VA_ARGS__)
+
+template <typename T>
+class LeadingMask {
+ public:
+  LeadingMask(const char* name, std::default_random_engine& gen) {
+    std::uniform_int_distribution<> dist(xsimd::batch<T>::size + 1);
+    for (int i = 0; i < kSize; ++i) {
+      inputs_[i] = dist(gen);
+    }
+    folly::addBenchmark(__FILE__, name, [this] { return run(); });
+  }
+
+ private:
+  unsigned run() {
+    xsimd::batch_bool<T> ans = {};
+    for (int i = 0; i < kSize; ++i) {
+      ans = ans ^ simd::leadingMask<T>(inputs_[i]);
+    }
+    folly::doNotOptimizeAway(ans);
+    return kSize;
+  }
+
+  static constexpr int kSize = 4 << 10;
+  int8_t inputs_[kSize];
+};
+
+} // namespace
+} // namespace facebook::velox
+
+int main(int argc, char* argv[]) {
+  using namespace facebook::velox;
+  folly::Init follyInit(&argc, &argv);
+  std::default_random_engine gen(std::random_device{}());
+  VELOX_BENCHMARK(LeadingMask<int32_t>, leadingMaskInt32, gen);
+  VELOX_BENCHMARK(LeadingMask<int64_t>, leadingMaskInt64, gen);
+  folly::runBenchmarks();
+  return 0;
+}