re PR tree-optimization/23942 (loop problem / testcase takes very long time to compile)

	PR tree-optimization/23942
	* Makefile.in (SCEV_H): Depends on PARAMS_H.
	* tree-scalar-evolution.c: Include params.h.
	(t_bool): New enum.
	(follow_ssa_edge, follow_ssa_edge_in_rhs,
	follow_ssa_edge_in_condition_phi_branch,
	follow_ssa_edge_in_condition_phi, follow_ssa_edge_inner_loop_phi):
	Change return type to t_bool.  Use a parameter to limit the size of
	trees that are walked before stopping
	(analyze_evolution_in_loop): Initialize the limit to 0.
	(follow_ssa_edge): Give up by returning t_dont_know if the limit
	exceeds PARAM_SCEV_MAX_EXPR_SIZE.

From-SVN: r104653

gcc/ChangeLog

+2005-09-26  Sebastian Pop  <pop@cri.ensmp.fr>
+
+	PR tree-optimization/23942
+	* Makefile.in (SCEV_H): Depends on PARAMS_H.
+	* tree-scalar-evolution.c: Include params.h.
+	(t_bool): New enum.
+	(follow_ssa_edge, follow_ssa_edge_in_rhs,
+	follow_ssa_edge_in_condition_phi_branch,
+	follow_ssa_edge_in_condition_phi, follow_ssa_edge_inner_loop_phi): 
+	Change return type to t_bool.  Use a parameter to limit the size of
+	trees that are walked before stopping 
+	(analyze_evolution_in_loop): Initialize the limit to 0.
+	(follow_ssa_edge): Give up by returning t_dont_know if the limit 
+	exceeds PARAM_SCEV_MAX_EXPR_SIZE.
+
 2005-09-26  Uros Bizjak  <uros@kss-loka.si>
 
 	PR middle-end/23831

gcc/Makefile.in

@@ -767,7 +767,7 @@ TREE_SSA_LIVE_H = tree-ssa-live.h $(PARTITION_H)
 PRETTY_PRINT_H = pretty-print.h input.h $(OBSTACK_H)
 DIAGNOSTIC_H = diagnostic.h diagnostic.def $(PRETTY_PRINT_H)
 C_PRETTY_PRINT_H = c-pretty-print.h $(PRETTY_PRINT_H) $(C_COMMON_H) $(TREE_H)
-SCEV_H = tree-scalar-evolution.h $(GGC_H) tree-chrec.h
+SCEV_H = tree-scalar-evolution.h $(GGC_H) tree-chrec.h $(PARAMS_H)
 LAMBDA_H = lambda.h tree.h vec.h $(GGC_H)
 TREE_DATA_REF_H = tree-data-ref.h $(LAMBDA_H)
 VARRAY_H = varray.h $(MACHMODE_H) $(SYSTEM_H) coretypes.h $(TM_H)