[Chore] (MG_Benchmark): add benchmark

MobileGL/MG_Benchmark/CMakeLists.txt

@@ -0,0 +1,25 @@
+cmake_minimum_required(VERSION 3.14)
+project(MobileGLTest)
+
+set(CMAKE_CXX_STANDARD 23)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+
+include(FetchContent)
+FetchContent_Declare(
+    benchmark
+    GIT_REPOSITORY https://github.com/google/benchmark.git
+    GIT_TAG        v1.9.4
+)
+FetchContent_MakeAvailable(benchmark)
+
+set(MGL_ROOT ${CMAKE_CURRENT_LIST_DIR}/../..)
+
+add_executable(
+  SanityBench
+  SanityBench.cpp
+)
+target_link_libraries(
+  SanityBench
+  benchmark::benchmark
+)

MobileGL/MG_Benchmark/SanityBench.cpp

@@ -0,0 +1,31 @@
+#include <benchmark/benchmark.h>
+#include <vector>
+
+static void Sanity_VectorResize(benchmark::State& state) {
+    for (auto _ : state) {
+        std::vector<int> v;
+        v.resize(state.range(0), 0);
+        for (int i = 0; i < state.range(0); i += 16) {
+            v[i] = i;
+        }
+    }
+    state.SetBytesProcessed(int64_t(state.iterations()) *
+                            int64_t(state.range(0)));
+}
+BENCHMARK(Sanity_VectorResize)->Arg(2<<5)->Arg(2<<10)->Arg(2<<20);
+
+
+static void Sanity_memcpy(benchmark::State& state) {
+    char* src = new char[state.range(0)];
+    char* dst = new char[state.range(0)];
+    memset(src, 'x', state.range(0));
+    for (auto _ : state)
+        memcpy(dst, src, state.range(0));
+    state.SetBytesProcessed(int64_t(state.iterations()) *
+                            int64_t(state.range(0)));
+    delete[] src;
+    delete[] dst;
+}
+BENCHMARK(Sanity_memcpy)->Range(8, 8<<10);
+
+BENCHMARK_MAIN();