src/share/vm/utilities/globalDefinitions.hpp

*** 456,465 ****
--- 456,472 ----
  
  inline void* align_pointer_up(const void* addr, size_t size) {
    return (void*) align_size_up_((uintptr_t)addr, size);
  }
  
+ // Align down with a lower bound. If the aligning results in 0, return 'alignment'.
+ 
+ inline size_t align_size_down_bounded(size_t size, size_t alignment) {
+   size_t aligned_size = align_size_down_(size, alignment);
+   return aligned_size > 0 ? aligned_size : alignment;
+ }
+ 
  // Clamp an address to be within a specific page
  // 1. If addr is on the page it is returned as is
  // 2. If addr is above the page_address the start of the *next* page will be returned
  // 3. Otherwise, if addr is below the page_address the start of the page will be returned
  inline address clamp_address_in_page(address addr, address page_address, intptr_t page_size) {