Add benchmark for clad::matrix

benchmark/Matrix.cpp

@@ -0,0 +1,66 @@
+#include "benchmark/benchmark.h"
+
+#include "clad/Differentiator/Differentiator.h"
+
+// Benchmarking clad::matrix initialization as identity matrix.
+static void BM_MatrixIdentity(benchmark::State& state) {
+  unsigned N = state.range(0);
+  for (auto _ : state) {
+    clad::matrix<double> m = clad::identity_matrix<double>(N, N);
+  }
+}
+
+BENCHMARK(BM_MatrixIdentity)
+    ->RangeMultiplier(2)
+    ->Range(4, 1024);
+
+// Benchmarking scalar operation on a row of clad::matrix.
+static void BM_MatrixRowOp(benchmark::State& state) {
+    unsigned N = state.range(0);
+    clad::matrix<double> m(N, N);
+    unsigned mid = N / 2;
+    for (auto _ : state) {
+        benchmark::DoNotOptimize(
+            m[mid] *= 2
+        );
+    }
+}
+
+BENCHMARK(BM_MatrixRowOp)
+    ->RangeMultiplier(2)
+    ->Range(4, 1024);
+
+// Benchmarking sum of two rows of a clad::matrix.
+static void BM_MatrixRowSum(benchmark::State& state) {
+    unsigned N = state.range(0);
+    clad::matrix<double> m(N, N);
+    clad::array<double> res(N);
+    unsigned mid = N / 2;
+    for (auto _ : state) {
+        benchmark::DoNotOptimize(
+            res = m[0] + m[mid]
+        );
+    }
+}
+
+BENCHMARK(BM_MatrixRowSum)
+    ->RangeMultiplier(2)
+    ->Range(4, 1024);
+
+// Benchmarking sum of all rows of a clad::matrix.
+static void BM_MatrixCompleteRowSum(benchmark::State& state) {
+    unsigned N = state.range(0);
+    clad::matrix<double> m(N, N);
+    clad::array<double> res(N);
+    for (auto _ : state) {  
+      for (unsigned i = 0; i < N; ++i) {
+          benchmark::DoNotOptimize(res += m[i]);
+      }
+    }
+}
+
+BENCHMARK(BM_MatrixRowSum)
+    ->RangeMultiplier(2)
+    ->Range(4, 1024);
+
+BENCHMARK_MAIN();