nobu	2013-12-20 19:01:14 +0900 (Fri, 20 Dec 2013)

  New Revision: 44302

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=44302

  Log:
    vm_method: set automatically
    
    * vm_method.c (GLOBAL_METHOD_CACHE_MASK): set from
      GLOBAL_METHOD_CACHE_SIZE automatically.

  Modified files:
    trunk/vm_method.c
Index: vm_method.c
===================================================================
--- vm_method.c	(revision 44301)
+++ vm_method.c	(revision 44302)
@@ -5,8 +5,13 @@ https://github.com/ruby/ruby/blob/trunk/vm_method.c#L5
 #ifndef GLOBAL_METHOD_CACHE_SIZE
 #define GLOBAL_METHOD_CACHE_SIZE 0x800
 #endif
+#define LSB_ONLY(x) ((x) & ~((x) - 1))
+#define POWOR_OF_2_P(x) ((x) == LSB_ONLY(x))
+#if !POWOR_OF_2_P(GLOBAL_METHOD_CACHE_SIZE)
+# error GLOBAL_METHOD_CACHE_SIZE must be power of 2
+#endif
 #ifndef GLOBAL_METHOD_CACHE_MASK
-#define GLOBAL_METHOD_CACHE_MASK 0x7ff
+#define GLOBAL_METHOD_CACHE_MASK (GLOBAL_METHOD_CACHE_SIZE-1)
 #endif
 
 #define GLOBAL_METHOD_CACHE_KEY(c,m) ((((c)>>3)^(m))&GLOBAL_METHOD_CACHE_MASK)

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