re PR debug/53923 (ICE: RTL check: expected code 'reg', have 'debug_expr' in…

re PR debug/53923 (ICE: RTL check: expected code 'reg', have 'debug_expr' in rhs_regno, at rtl.h:1091)

	PR debug/53923
	* valtrack.c (dead_debug_insert_temp): Drop non-reg uses
	from the chain.

From-SVN: r190883

gcc/ChangeLog

+2012-09-03  Jakub Jelinek  <jakub@redhat.com>
+
+	PR debug/53923
+	* valtrack.c (dead_debug_insert_temp): Drop non-reg uses
+	from the chain.
+
 2012-09-03  Joseph Myers  <joseph@codesourcery.com>
 
 	* common.opt (--no-sysroot-suffix): New driver option.

gcc/valtrack.c

@@ -333,6 +333,14 @@ dead_debug_insert_temp (struct dead_debug *debug, unsigned int uregno,
     {
       if (DF_REF_REGNO (cur->use) == uregno)
 	{
+	  /* If this loc has been changed e.g. to debug_expr already
+	     as part of a multi-register use, just drop it.  */
+	  if (!REG_P (*DF_REF_REAL_LOC (cur->use)))
+	    {
+	      *tailp = cur->next;
+	      XDELETE (cur);
+	      continue;
+	    }
 	  *usesp = cur;
 	  usesp = &cur->next;
 	  *tailp = cur->next;