tree-pass.h (pass_cselim): Declare new pass.

        * tree-pass.h (pass_cselim): Declare new pass.
        * passes.c (init_optimization_passes): Link in pass_cselim.
        * tree-ssa-phiopt.c (tree_ssa_phiopt_worker): Renamed from
        tree_ssa_phiopt; add do_store_elim parameter, handle it by calling
        cond_store_replacement.
        (condstoretemp): New static variable.
        (cond_store_replacement): New function.
        (tree_ssa_phiopt, tree_ssa_cs_elim): New wrappers around
        tree_ssa_phiopt_worker.
        (struct name_to_bb): New.
        (get_non_trapping, name_to_bb_hash, name_to_bb_eq, add_or_mark_expr,
        nt_init_block, nt_fini_block): New static functions.
        (seen_ssa_names, nontrap_set): New static variables.
        (gate_cselim, pass_cselim): Define new pass.
        * common.opt (ftree-cselim): New flag.
        * toplev.c (process_options): Set flag_tree_cselim if required.

From-SVN: r128324

gcc/ChangeLog

+2007-09-10  Michael Matz  <matz@suse.de>
+
+	* tree-pass.h (pass_cselim): Declare new pass.
+	* passes.c (init_optimization_passes): Link in pass_cselim.
+	* tree-ssa-phiopt.c (tree_ssa_phiopt_worker): Renamed from
+	tree_ssa_phiopt; add do_store_elim parameter, handle it by calling
+	cond_store_replacement.
+	(condstoretemp): New static variable.
+	(cond_store_replacement): New function.
+	(tree_ssa_phiopt, tree_ssa_cs_elim): New wrappers around
+	tree_ssa_phiopt_worker.
+	(struct name_to_bb): New.
+	(get_non_trapping, name_to_bb_hash, name_to_bb_eq, add_or_mark_expr,
+	nt_init_block, nt_fini_block): New static functions.
+	(seen_ssa_names, nontrap_set): New static variables.
+	(gate_cselim, pass_cselim): Define new pass.
+	* common.opt (ftree-cselim): New flag.
+	* toplev.c (process_options): Set flag_tree_cselim if required.
+
 2007-09-10  Hans-Peter Nilsson  <hp@axis.com>
 
 	* simplify-rtx.c (simplify_relational_operation_1): For recent

gcc/common.opt

@@ -1052,6 +1052,10 @@ ftree-store-copy-prop
 Common Report Var(flag_tree_store_copy_prop) Optimization
 Enable copy propagation for stores and loads
 
+ftree-cselim
+Common Report Var(flag_tree_cselim) Init(2) Optimization
+Transform condition stores into unconditional ones
+
 ftree-dce
 Common Report Var(flag_tree_dce) Optimization
 Enable SSA dead code elimination optimization on trees

gcc/passes.c

@@ -569,6 +569,7 @@ init_optimization_passes (void)
       NEXT_PASS (pass_merge_phi);
       NEXT_PASS (pass_vrp);
       NEXT_PASS (pass_dce);
+      NEXT_PASS (pass_cselim);
       NEXT_PASS (pass_dominator);
       /* The only const/copy propagation opportunities left after
 	 DOM should be due to degenerate PHI nodes.  So rather than

gcc/toplev.c

@@ -1920,6 +1920,13 @@ process_options (void)
   if (flag_var_tracking == AUTODETECT_VALUE)
     flag_var_tracking = optimize >= 1;
 
+  if (flag_tree_cselim == AUTODETECT_VALUE)
+#ifdef HAVE_conditional_move
+    flag_tree_cselim = 1;
+#else
+    flag_tree_cselim = 0;
+#endif
+
   /* If the user specifically requested variable tracking with tagging
      uninitialized variables, we need to turn on variable tracking.
      (We already determined above that variable tracking is feasible.)  */

gcc/tree-pass.h

@@ -301,6 +301,7 @@ extern struct tree_opt_pass pass_cse_sincos;
 extern struct tree_opt_pass pass_convert_to_rsqrt;
 extern struct tree_opt_pass pass_warn_function_return;
 extern struct tree_opt_pass pass_warn_function_noreturn;
+extern struct tree_opt_pass pass_cselim;
 extern struct tree_opt_pass pass_phiopt;
 extern struct tree_opt_pass pass_forwprop;
 extern struct tree_opt_pass pass_phiprop;