src/share/vm/utilities/align.hpp

@@ -42,11 +42,11 @@
 
 #define align_down_(size, alignment) ((size) & ~align_mask_widened((alignment), (size)))
 
 #define align_up_(size, alignment) (align_down_((size) + align_mask(alignment), (alignment)))
 
-#define is_aligned_(size, alignment) ((size) == (align_up_((size), (alignment))))
+#define is_aligned_(size, alignment) (((size) & align_mask(alignment)) == 0)
 
 // Temporary declaration until this file has been restructured.
 template <typename T>
 bool is_power_of_2_t(T x) {
   return (x != T(0)) && ((x & (x - 1)) == T(0));