emit-rtl.c (reset_all_used_flags): New function.

2013-04-15  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>

	* emit-rtl.c (reset_all_used_flags): New function.
	(verify_rtl_sharing): Call reset_all_used_flags before and after
	performing the checks.

From-SVN: r197971

gcc/ChangeLog

+2013-04-15  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>
+
+	* emit-rtl.c (reset_all_used_flags): New function.
+	(verify_rtl_sharing): Call reset_all_used_flags before and after
+	performing the checks.
+
 2013-04-15  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
 	* config/arm/arm.c (const_ok_for_dimode_op): Handle AND case.

gcc/emit-rtl.c

@@ -2596,16 +2596,13 @@ verify_rtx_sharing (rtx orig, rtx insn)
   return;
 }
 
-/* Go through all the RTL insn bodies and check that there is no unexpected
-   sharing in between the subexpressions.  */
+/* Go through all the RTL insn bodies and clear all the USED bits.  */
 
-DEBUG_FUNCTION void
-verify_rtl_sharing (void)
+static void
+reset_all_used_flags (void)
 {
   rtx p;
 
-  timevar_push (TV_VERIFY_RTL_SHARING);
-
   for (p = get_insns (); p; p = NEXT_INSN (p))
     if (INSN_P (p))
       {
@@ -2629,6 +2626,19 @@ verify_rtl_sharing (void)
 	      }
 	  }
       }
+}
+
+/* Go through all the RTL insn bodies and check that there is no unexpected
+   sharing in between the subexpressions.  */
+
+DEBUG_FUNCTION void
+verify_rtl_sharing (void)
+{
+  rtx p;
+
+  timevar_push (TV_VERIFY_RTL_SHARING);
+
+  reset_all_used_flags ();
 
   for (p = get_insns (); p; p = NEXT_INSN (p))
     if (INSN_P (p))
@@ -2639,6 +2649,8 @@ verify_rtl_sharing (void)
 	  verify_rtx_sharing (CALL_INSN_FUNCTION_USAGE (p), p);
       }
 
+  reset_all_used_flags ();
+
   timevar_pop (TV_VERIFY_RTL_SHARING);
 }