normal	2018-08-21 08:48:03 +0900 (Tue, 21 Aug 2018)

  New Revision: 64487

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=64487

  Log:
    cont.c (struct rb_fiber_struct): bitfields for trasnferred and status
    
    On 32-bit x86, this reduces the struct from 836 to 832 bytes and
    brings us down to 13 (64-byte) cachelines (from 14).

  Modified files:
    trunk/cont.c
Index: cont.c
===================================================================
--- cont.c	(revision 64486)
+++ cont.c	(revision 64487)
@@ -175,12 +175,12 @@ struct rb_fiber_struct { https://github.com/ruby/ruby/blob/trunk/cont.c#L175
     rb_context_t cont;
     VALUE first_proc;
     struct rb_fiber_struct *prev;
-    enum fiber_status status;
+    BITFIELD(enum fiber_status status) : 2;
     /* If a fiber invokes "transfer",
      * then this fiber can't "resume" any more after that.
      * You shouldn't mix "transfer" and "resume".
      */
-    int transferred;
+    unsigned int transferred : 1;
 
 #if FIBER_USE_NATIVE
 #ifdef _WIN32

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