re PR middle-end/44554 (Stack space after sigsetjmp is reused)

2010-09-09  Vladimir Makarov  <vmakarov@redhat.com>

	PR middle-end/44554
	* ira.c (ira): Switch off sharing spill slots if setjmp is called.

From-SVN: r164102

gcc/ChangeLog

 2010-09-09  Vladimir Makarov  <vmakarov@redhat.com>
 
+	PR middle-end/44554
+	* ira.c (ira): Switch off sharing spill slots if setjmp is called.
+
+2010-09-09  Vladimir Makarov  <vmakarov@redhat.com>
+
 	PR middle-end/40386
 	* ira.c (pseudo_for_reload_consideration_p): Don't use
 	flag_ira_share_spill_slots.

gcc/ira.c

@@ -3178,9 +3178,12 @@ ira (FILE *f)
   ira_assert (ira_conflicts_p || !loops_p);
 
   saved_flag_ira_share_spill_slots = flag_ira_share_spill_slots;
-  if (too_high_register_pressure_p ())
+  if (too_high_register_pressure_p () || cfun->calls_setjmp)
     /* It is just wasting compiler's time to pack spilled pseudos into
-       stack slots in this case -- prohibit it.  */
+       stack slots in this case -- prohibit it.  We also do this if
+       there is setjmp call because a variable not modified between
+       setjmp and longjmp the compiler is required to preserve its
+       value and sharing slots does not guarantee it.  */
     flag_ira_share_spill_slots = FALSE;
 
   ira_color ();