lra-remat.c (cand_transf_func): Process regno for rematerialization too.

2014-11-15  Vladimir Makarov  <vmakarov@redhat.com>

	* lra-remat.c (cand_transf_func): Process regno for
	rematerialization too.
	* lra.c (lra): Switch on rematerialization pass.

From-SVN: r217624

gcc/ChangeLog

 2014-11-15  Vladimir Makarov  <vmakarov@redhat.com>
 
+	* lra-remat.c (cand_transf_func): Process regno for
+	rematerialization too.
+	* lra.c (lra): Switch on rematerialization pass.
+
+2014-11-15  Vladimir Makarov  <vmakarov@redhat.com>
+
 	* lra.c (lra): Switch off rematerialization pass.
 
 2014-11-15  Marc Glisse  <marc.glisse@inria.fr>

gcc/lra-remat.c

@@ -860,6 +860,10 @@ cand_trans_fun (int bb_index, bitmap bb_in, bitmap bb_out)
 	    bitmap_set_bit (&temp_bitmap, cid);
 	    break;
 	  }
+      /* Check regno for rematerialization.  */
+      if (bitmap_bit_p (bb_changed_regs, cand->regno)
+	  || bitmap_bit_p (bb_dead_regs, cand->regno))
+	bitmap_set_bit (&temp_bitmap, cid);
     }
   return bitmap_ior_and_compl (bb_out,
 			       &bb_info->gen_cands, bb_in, &temp_bitmap);

gcc/lra.c

@@ -2354,7 +2354,7 @@ lra (FILE *f)
 	break;
       /* Now we know what pseudos should be spilled.  Try to
 	 rematerialize them first.  */
-      if (0&&lra_remat ())
+      if (lra_remat ())
 	{
 	  /* We need full live info -- see the comment above.  */
 	  lra_create_live_ranges (lra_reg_spill_p, true);