re PR tree-optimization/54489 (tree FRE uses an excessive amount of memory)

2012-09-12  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/54489
	* tree-ssa-pre.c: Include domwalk.h.
	(in_fre): Remove.
	(sccvn_valnum_from_value_id): New function.
	(debug_bitmap_sets_for): Simplify.
	(get_representative_for): Properly initialize the SCCVN valnum.
	(create_expression_by_pieces): Likewise.
	(insert_into_preds_of_block): Likewise.
	(can_PRE_operation): Remove.
	(make_values_for_phi): Simplify.
	(compute_avail): Likewise.
	(do_SCCVN_insertion): Remove.
	(eliminate_avail, eliminate_push_avail, eliminate_insert):
	New functions.
	(eliminate): Split and perform a domwalk.
	(eliminate_bb): Former eliminate part that is now dom-enter.
	(eliminate_leave_block): New function.
	(fini_eliminate): Likewise.
	(init_pre): Simplify.
	(fini_pre): Likewise.
	(execute_pre): Fold into do_pre and do_fre.
	(do_pre): Consume execute_pre.
	(do_fre): Likewise.
	* Makefile.in (tree-ssa-pre.o): Add domwalk.h dependency.

From-SVN: r191225

gcc/ChangeLog

+2012-09-12  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/54489
+	* tree-ssa-pre.c: Include domwalk.h.
+	(in_fre): Remove.
+	(sccvn_valnum_from_value_id): New function.
+	(debug_bitmap_sets_for): Simplify.
+	(get_representative_for): Properly initialize the SCCVN valnum.
+	(create_expression_by_pieces): Likewise.
+	(insert_into_preds_of_block): Likewise.
+	(can_PRE_operation): Remove.
+	(make_values_for_phi): Simplify.
+	(compute_avail): Likewise.
+	(do_SCCVN_insertion): Remove.
+	(eliminate_avail, eliminate_push_avail, eliminate_insert):
+	New functions.
+	(eliminate): Split and perform a domwalk.
+	(eliminate_bb): Former eliminate part that is now dom-enter.
+	(eliminate_leave_block): New function.
+	(fini_eliminate): Likewise.
+	(init_pre): Simplify.
+	(fini_pre): Likewise.
+	(execute_pre): Fold into do_pre and do_fre.
+	(do_pre): Consume execute_pre.
+	(do_fre): Likewise.
+	* Makefile.in (tree-ssa-pre.o): Add domwalk.h dependency.
+
 2012-09-12  Diego Novillo  <dnovillo@google.com>
 
 	* vec.h: Remove compatibility notes for previous distinction

gcc/Makefile.in

@@ -2317,7 +2317,7 @@ tree-ssa-pre.o : tree-ssa-pre.c $(TREE_FLOW_H) $(CONFIG_H) \
    $(TM_H) coretypes.h $(TREE_PASS_H) $(FLAGS_H) langhooks.h \
    $(CFGLOOP_H) alloc-pool.h $(BASIC_BLOCK_H) $(BITMAP_H) $(HASH_TABLE_H) \
    $(GIMPLE_H) $(TREE_INLINE_H) tree-iterator.h tree-ssa-sccvn.h $(PARAMS_H) \
-   $(DBGCNT_H) tree-scalar-evolution.h $(GIMPLE_PRETTY_PRINT_H)
+   $(DBGCNT_H) tree-scalar-evolution.h $(GIMPLE_PRETTY_PRINT_H) domwalk.h
 tree-ssa-sccvn.o : tree-ssa-sccvn.c $(TREE_FLOW_H) $(CONFIG_H) \
    $(SYSTEM_H) $(TREE_H) $(DIAGNOSTIC_H) \
    $(TM_H) coretypes.h dumpfile.h $(FLAGS_H) $(CFGLOOP_H) \