re PR middle-end/61430 (ICE in lra_create_copy)

2014-06-16  Chung-Lin Tang  <cltang@codesourcery.com>

	PR middle-end/61430
	* lra-lives.c (process_bb_lives): Skip creating copy during
	insn scan when src/dest has constrained to same regno.

From-SVN: r211701

gcc/ChangeLog

+2014-06-16  Chung-Lin Tang  <cltang@codesourcery.com>
+
+	PR middle-end/61430
+	* lra-lives.c (process_bb_lives): Skip creating copy during
+	insn scan when src/dest has constrained to same regno.
+
 2014-06-15  Jan Hubicka  <hubicka@ucw.cz>
 
 	* tree-vect-data-refs.c (vect_can_force_dr_alignment_p): Check again

gcc/lra-lives.c

@@ -558,7 +558,11 @@ process_bb_lives (basic_block bb, int &curr_point)
 	      /* It might be 'inheritance pseudo <- reload pseudo'.  */
 	      || (src_regno >= lra_constraint_new_regno_start
 		  && ((int) REGNO (SET_DEST (set))
-		      >= lra_constraint_new_regno_start))))
+		      >= lra_constraint_new_regno_start)
+		  /* Remember to skip special cases where src/dest regnos are
+		     the same, e.g. insn SET pattern has matching constraints
+		     like =r,0.  */
+		  && src_regno != (int) REGNO (SET_DEST (set)))))
 	{
 	  int hard_regno = -1, regno = -1;