--- old/src/os/windows/vm/os_windows.cpp	2012-12-13 05:31:22.000000000 +0100
+++ new/src/os/windows/vm/os_windows.cpp	2012-12-13 05:31:21.000000000 +0100
@@ -2895,6 +2895,28 @@
   }
 }
 
+char* os::reserve_memory_aligned(size_t bytes, size_t alignment) {
+  size_t size = align_size_up(bytes, alignment);
+  size_t extra_size = size + alignment;
+  char* aligned_base = NULL;
+
+  do {
+    char* extra_base = os::reserve_memory(extra_size, NULL, alignment);
+    if (extra_base == NULL) {
+      return NULL;
+    }
+    // Do manual alignment
+    aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment);
+
+    os::release_memory(extra_base, extra_size);
+
+    aligned_base = os::reserve_memory(size, aligned_base);
+
+  } while (aligned_base == NULL);
+
+  return aligned_base;
+}
+
 char* os::pd_reserve_memory(size_t bytes, char* addr, size_t alignment_hint) {
   assert((size_t)addr % os::vm_allocation_granularity() == 0,
          "reserve alignment");