bionic: move benchmarks out of tests directory

Change-Id: I4d054965198af22c9a9c821d1bc53f4e9ea01248

benchmarks/string_benchmark.cpp

@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * 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 "benchmark.h"
+
+#include <string.h>
+
+#define KB 1024
+#define MB 1024*KB
+
+#define AT_COMMON_SIZES \
+    Arg(8)->Arg(64)->Arg(512)->Arg(1*KB)->Arg(8*KB)->Arg(16*KB)->Arg(32*KB)->Arg(64*KB)
+
+// TODO: test unaligned operation too? (currently everything will be 8-byte aligned by malloc.)
+
+static void BM_string_memcmp(int iters, int nbytes) {
+  StopBenchmarkTiming();
+  char* src = new char[nbytes]; char* dst = new char[nbytes];
+  memset(src, 'x', nbytes);
+  memset(dst, 'x', nbytes);
+  StartBenchmarkTiming();
+
+  volatile int c __attribute__((unused)) = 0;
+  for (int i = 0; i < iters; ++i) {
+    c += memcmp(dst, src, nbytes);
+  }
+
+  StopBenchmarkTiming();
+  SetBenchmarkBytesProcessed(int64_t(iters) * int64_t(nbytes));
+  delete[] src;
+  delete[] dst;
+}
+BENCHMARK(BM_string_memcmp)->AT_COMMON_SIZES;
+
+static void BM_string_memcpy(int iters, int nbytes) {
+  StopBenchmarkTiming();
+  char* src = new char[nbytes]; char* dst = new char[nbytes];
+  memset(src, 'x', nbytes);
+  StartBenchmarkTiming();
+
+  for (int i = 0; i < iters; ++i) {
+    memcpy(dst, src, nbytes);
+  }
+
+  StopBenchmarkTiming();
+  SetBenchmarkBytesProcessed(int64_t(iters) * int64_t(nbytes));
+  delete[] src;
+  delete[] dst;
+}
+BENCHMARK(BM_string_memcpy)->AT_COMMON_SIZES;
+
+static void BM_string_memmove(int iters, int nbytes) {
+  StopBenchmarkTiming();
+  char* buf = new char[nbytes + 64];
+  memset(buf, 'x', nbytes + 64);
+  StartBenchmarkTiming();
+
+  for (int i = 0; i < iters; ++i) {
+    memmove(buf, buf + 1, nbytes); // Worst-case overlap.
+  }
+
+  StopBenchmarkTiming();
+  SetBenchmarkBytesProcessed(int64_t(iters) * int64_t(nbytes));
+  delete[] buf;
+}
+BENCHMARK(BM_string_memmove)->AT_COMMON_SIZES;
+
+static void BM_string_memset(int iters, int nbytes) {
+  StopBenchmarkTiming();
+  char* dst = new char[nbytes];
+  StartBenchmarkTiming();
+
+  for (int i = 0; i < iters; ++i) {
+    memset(dst, 0, nbytes);
+  }
+
+  StopBenchmarkTiming();
+  SetBenchmarkBytesProcessed(int64_t(iters) * int64_t(nbytes));
+  delete[] dst;
+}
+BENCHMARK(BM_string_memset)->AT_COMMON_SIZES;
+
+static void BM_string_strlen(int iters, int nbytes) {
+  StopBenchmarkTiming();
+  char* s = new char[nbytes];
+  memset(s, 'x', nbytes);
+  s[nbytes - 1] = 0;
+  StartBenchmarkTiming();
+
+  volatile int c __attribute__((unused)) = 0;
+  for (int i = 0; i < iters; ++i) {
+    c += strlen(s);
+  }
+
+  StopBenchmarkTiming();
+  SetBenchmarkBytesProcessed(int64_t(iters) * int64_t(nbytes));
+  delete[] s;
+}
+BENCHMARK(BM_string_strlen)->AT_COMMON_SIZES;