re PR rtl-optimization/61608 (FAIL: gcc.target/arm/epilog-1.c scan-assembler tests)

PR rtl-opt/61608

        PR target/39284
        * bb-reorder.c (pass_duplicate_computed_gotos::execute): Cleanup
        the cfg if there were any changes.
        * passes.def: Revert move of peephole2 after reorder_blocks;
        move duplicate_computed_gotos before peephole2.

From-SVN: r212172

gcc/ChangeLog

+2014-06-30  Richard Henderson  <rth@redhat.com>
+
+	PR rtl-opt/61608
+	PR target/39284
+	* bb-reorder.c (pass_duplicate_computed_gotos::execute): Cleanup
+	the cfg if there were any changes.
+	* passes.def: Revert move of peephole2 after reorder_blocks;
+	move duplicate_computed_gotos before peephole2.
+
 2014-06-30  Uros Bizjak  <ubizjak@gmail.com>
 
 	* except.c (emit_note_eh_region_end): New helper function.

gcc/bb-reorder.c

@@ -2520,13 +2520,20 @@ pass_duplicate_computed_gotos::execute (function *fun)
       changed = true;
     }
 
-done:
-  /* Duplicating blocks above will redirect edges and may cause hot blocks
-     previously reached by both hot and cold blocks to become dominated only
-     by cold blocks.  */
+ done:
   if (changed)
-    fixup_partitions ();
-  cfg_layout_finalize ();
+    {
+      /* Duplicating blocks above will redirect edges and may cause hot
+	 blocks previously reached by both hot and cold blocks to become
+	 dominated only by cold blocks.  */
+      fixup_partitions ();
+
+      /* Merge the duplicated blocks into predecessors, when possible.  */
+      cfg_layout_finalize ();
+      cleanup_cfg (0);
+    }
+  else
+    cfg_layout_finalize ();
 
   BITMAP_FREE (candidates);
   return 0;

gcc/passes.def

@@ -396,20 +396,13 @@ along with GCC; see the file COPYING3.  If not see
 	  NEXT_PASS (pass_rtl_dse2);
 	  NEXT_PASS (pass_stack_adjustments);
 	  NEXT_PASS (pass_jump2);
+	  NEXT_PASS (pass_duplicate_computed_gotos);
+	  NEXT_PASS (pass_peephole2);
 	  NEXT_PASS (pass_if_after_reload);
 	  NEXT_PASS (pass_regrename);
 	  NEXT_PASS (pass_cprop_hardreg);
 	  NEXT_PASS (pass_fast_rtl_dce);
-	  NEXT_PASS (pass_duplicate_computed_gotos);
 	  NEXT_PASS (pass_reorder_blocks);
-	  /* We need to run peephole2 pass after the duplicate-
-	     compute-gotos and the reorder-blocks pass (PR/39284).
-	     We have a single indirect branch in the entire function
-	     before duplicate-compute-gotos pass.  This vastly reduces
-	     the size of the CFG.
-	     For preventing to run peephole2 pass twice, its run after
-	     the jump2 got removed.  */
-	  NEXT_PASS (pass_peephole2);
 	  NEXT_PASS (pass_branch_target_load_optimize2);
 	  NEXT_PASS (pass_leaf_regs);
 	  NEXT_PASS (pass_split_before_sched2);