re PR rtl-optimization/85458 (FAIL: gcc.dg/pr83480.c (internal compiler error))

	PR rtl-optimization/85458
	* sel-sched.c (sel_target_adjust_priority): Allow backend adjust
	priority hook to reduce the priority of EXPR.

From-SVN: r264168

gcc/ChangeLog

+2018-09-08  John David Anglin  <danglin@gcc.gnu.org>
+
+	PR rtl-optimization/85458
+	* sel-sched.c (sel_target_adjust_priority): Allow backend adjust
+	priority hook to reduce the priority of EXPR.
+
 2018-09-07  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/i386.md (float<SWI48x:mode><MODEF:mode>2) Enable

gcc/sel-sched.c

@@ -3330,11 +3330,11 @@ sel_target_adjust_priority (expr_t expr)
   else
     new_priority = priority;
 
+  gcc_assert (new_priority >= 0);
+
   /* If the priority has changed, adjust EXPR_PRIORITY_ADJ accordingly.  */
   EXPR_PRIORITY_ADJ (expr) = new_priority - EXPR_PRIORITY (expr);
 
-  gcc_assert (EXPR_PRIORITY_ADJ (expr) >= 0);
-
   if (sched_verbose >= 4)
     sel_print ("sel_target_adjust_priority: insn %d,  %d+%d = %d.\n",
 	       INSN_UID (EXPR_INSN_RTX (expr)), EXPR_PRIORITY (expr),