normal	2014-07-20 13:18:58 +0900 (Sun, 20 Jul 2014)

  New Revision: 46883

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=46883

  Log:
    rb_io_t: shrink from 216 to 200 bytes on 64-bit
    
    * include/ruby/io.h (rb_io_t): shrink to 200 bytes from 216 on 64-bit
      This puts us within 8 bytes of being three cache lines instead of
      four lines on x86-64.  This breaks the ABI.
      [Feature #10050]

  Modified files:
    trunk/ChangeLog
    trunk/include/ruby/io.h
Index: include/ruby/io.h
===================================================================
--- include/ruby/io.h	(revision 46882)
+++ include/ruby/io.h	(revision 46883)
@@ -59,8 +59,8 @@ typedef struct { https://github.com/ruby/ruby/blob/trunk/include/ruby/io.h#L59
 } rb_io_buffer_t;
 
 typedef struct rb_io_t {
-    int fd;                     /* file descriptor */
     FILE *stdio_file;		/* stdio ptr for read/write if available */
+    int fd;                     /* file descriptor */
     int mode;			/* mode flags: FMODE_XXXs */
     rb_pid_t pid;		/* child's pid (for pipes) */
     int lineno;			/* number of lines read */
@@ -89,9 +89,9 @@ typedef struct rb_io_t { https://github.com/ruby/ruby/blob/trunk/include/ruby/io.h#L89
 
     rb_econv_t *writeconv;
     VALUE writeconv_asciicompat;
+    int writeconv_initialized;
     int writeconv_pre_ecflags;
     VALUE writeconv_pre_ecopts;
-    int writeconv_initialized;
 
     VALUE write_lock;
 } rb_io_t;
Index: ChangeLog
===================================================================
--- ChangeLog	(revision 46882)
+++ ChangeLog	(revision 46883)
@@ -1,3 +1,10 @@ https://github.com/ruby/ruby/blob/trunk/ChangeLog#L1
+Sun Jul 20 12:41:53 2014  Eric Wong  <e@8...>
+
+	* include/ruby/io.h (rb_io_t): shrink to 200 bytes from 216 on 64-bit
+	  This puts us within 8 bytes of being three cache lines instead of
+	  four lines on x86-64.  This breaks the ABI.
+	  [Feature #10050]
+
 Sun Jul 20 12:36:46 2014  Eric Wong  <e@8...>
 
 	* include/ruby/oniguruma.h (struct re_pattern_buffer): shrink to 448

--
ML: ruby-changes@q...
Info: http://www.atdot.net/~ko1/quickml/