re PR rtl-optimization/49154 (build fails on cris-elf in libgcc: ICE in…

re PR rtl-optimization/49154 (build fails on cris-elf in libgcc: ICE in setup_pressure_classes, at ira.c:902)

	PR rtl-optimization/49154
	* ira-costs.c (setup_regno_cost_classes_by_mode): If there
	already is a matching slot in the hashtable, assign it to
	classes_ptr.

From-SVN: r174868

gcc/ChangeLog

 2011-06-10  Hans-Peter Nilsson  <hp@axis.com>
 
 	PR rtl-optimization/49154
+	* ira-costs.c (setup_regno_cost_classes_by_mode): If there
+	already is a matching slot in the hashtable, assign it to
+	classes_ptr.
+
+	PR rtl-optimization/49154
 	* doc/tm.texi.in (Register Classes): Document rule for the narrowest
 	register classes.
 	* doc/tm.texi: Regenerate.

gcc/ira-costs.c

@@ -299,6 +299,8 @@ setup_regno_cost_classes_by_mode (int regno, enum machine_mode mode)
 	  classes_ptr = setup_cost_classes (&classes);
 	  *slot = classes_ptr;
 	}
+      else
+	classes_ptr = *slot;
       cost_classes_mode_cache[mode] = (cost_classes_t) *slot;
     }
   regno_cost_classes[regno] = classes_ptr;