Add D examples and beautify all examples names

1 files changed, 25 insertions, 0 deletions

diff --git a/examples/c++/Sum_over_array_(Optimized).cpp b/examples/c++/Sum_over_array_(Optimized).cpp
new file mode 100644
index 000000000..3304ff3e6
--- /dev/null
+++ b/examples/c++/Sum_over_array_(Optimized).cpp
@@ -0,0 +1,25 @@
+// Compile with -O3 -march=native to see autovectorization
+// assumes input is aligned on 64-byte boundary and that
+// length is a multiple of 64.
+int testFunction(int* input, int length) {
+  // Alignment hints supported on GCC 4.7+ and any compiler
+  // supporting the appropriate builtin (clang 3.6+).
+#ifndef __has_builtin
+#define __has_builtin(x) 0
+#endif
+#if __GNUC__ > 4 \
+    || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7) \
+    || __has_builtin(__builtin_assume_aligned)
+  input = static_cast<int*>(__builtin_assume_aligned(input, 64));
+#endif
+#if _MSC_VER
+  __assume((length & 63) == 0);
+#else
+  if (length & 63) __builtin_unreachable();
+#endif
+  int sum = 0;
+  for (int i = 0; i < length; ++i) {
+    sum += input[i];
+  }
+  return sum;
+}