kosaki	2012-12-02 06:15:01 +0900 (Sun, 02 Dec 2012)

  New Revision: 38134

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=38134

  Log:
    * gc.h (SET_MACHINE_STACK_END): add volatile for preventing
      harmful optimization.

  Modified files:
    trunk/ChangeLog
    trunk/gc.h

Index: ChangeLog
===================================================================
--- ChangeLog	(revision 38133)
+++ ChangeLog	(revision 38134)
@@ -1,3 +1,8 @@
+Sun Dec  2 06:02:00 2012  KOSAKI Motohiro  <kosaki.motohiro@g...>
+
+	* gc.h (SET_MACHINE_STACK_END): add volatile for preventing
+	  harmful optimization.
+
 Sun Dec  2 05:01:58 2012  Koichi Sasada  <ko1@a...>
 
 	* iseq.c (rb_iseq_line_trace_each): iterate `line' event only.
Index: gc.h
===================================================================
--- gc.h	(revision 38133)
+++ gc.h	(revision 38134)
@@ -3,9 +3,9 @@
 #define RUBY_GC_H 1
 
 #if defined(__x86_64__) && defined(__GNUC__) && !defined(__native_client__)
-#define SET_MACHINE_STACK_END(p) __asm__("movq\t%%rsp, %0" : "=r" (*(p)))
+#define SET_MACHINE_STACK_END(p) __asm__ volatile ("movq\t%%rsp, %0" : "=r" (*(p)))
 #elif defined(__i386) && defined(__GNUC__) && !defined(__native_client__)
-#define SET_MACHINE_STACK_END(p) __asm__("movl\t%%esp, %0" : "=r" (*(p)))
+#define SET_MACHINE_STACK_END(p) __asm__ volatile ("movl\t%%esp, %0" : "=r" (*(p)))
 #else
 NOINLINE(void rb_gc_set_stack_end(VALUE **stack_end_p));
 #define SET_MACHINE_STACK_END(p) rb_gc_set_stack_end(p)

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