*** old/src/os/windows/vm/os_windows.cpp	Fri Dec 14 09:31:01 2012
--- new/src/os/windows/vm/os_windows.cpp	Fri Dec 14 09:31:01 2012

*** 2893,2902 ****
--- 2893,2929 ----
        reserve_memory(size - split, base + split);
      }
    }
  }
  
+ char* os::reserve_memory_aligned(size_t size, size_t alignment) {
+   assert((alignment & (os::vm_allocation_granularity() - 1)) == 0,
+       "Alignment must be a multiple of allocation granularity (page size)");
+   assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned");
+ 
+   size_t extra_size = size + alignment;
+   assert(extra_size >= size, "overflow, size is too large to allow 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");
    assert(bytes % os::vm_allocation_granularity() == 0, "reserve block size");
    char* res;