opts.c: Add -fhoist-adjacent-loads to -O2 and above.

2012-06-12  Bill Schmidt  <wschmidt@linux.ibm.com>

	* opts.c: Add -fhoist-adjacent-loads to -O2 and above.
	* tree-ssa-phiopt.c (tree_ssa_phiopt_worker): Add argument to forward
	declaration.
	(hoist_adjacent_loads, gate_hoist_loads): New forward declarations.
	(tree_ssa_phiopt): Call gate_hoist_loads.
	(tree_ssa_cs_elim): Add parm to tree_ssa_phiopt_worker call.
	(tree_ssa_phiopt_worker): Add do_hoist_loads to formal arg list; call
	hoist_adjacent_loads.
	(local_mem_dependence): New function.
	(hoist_adjacent_loads): Likewise.
	(gate_hoist_loads): Likewise.
	* common.opt (fhoist-adjacent-loads): New switch.
	* Makefile.in (tree-ssa-phiopt.o): Added dependencies.

From-SVN: r188457

gcc/ChangeLog

+2012-06-12  Bill Schmidt  <wschmidt@linux.ibm.com>
+
+	* opts.c: Add -fhoist-adjacent-loads to -O2 and above.
+	* tree-ssa-phiopt.c (tree_ssa_phiopt_worker): Add argument to forward
+	declaration.
+	(hoist_adjacent_loads, gate_hoist_loads): New forward declarations.
+	(tree_ssa_phiopt): Call gate_hoist_loads.
+	(tree_ssa_cs_elim): Add parm to tree_ssa_phiopt_worker call.
+	(tree_ssa_phiopt_worker): Add do_hoist_loads to formal arg list; call
+	hoist_adjacent_loads.
+	(local_mem_dependence): New function.
+	(hoist_adjacent_loads): Likewise.
+	(gate_hoist_loads): Likewise.
+	* common.opt (fhoist-adjacent-loads): New switch.
+	* Makefile.in (tree-ssa-phiopt.o): Added dependencies.
+
 2012-06-12  Michael Matz  <matz@suse.de>
 
 	* alias.c (nonoverlapping_component_refs_p): Take two rtx arguments.

gcc/Makefile.in

@@ -2368,7 +2368,8 @@ tree-ssa-phiopt.o : tree-ssa-phiopt.c $(CONFIG_H) $(SYSTEM_H) coretypes.h \
    $(TM_H) $(GGC_H) $(TREE_H) $(TM_P_H) $(BASIC_BLOCK_H) \
    $(TREE_FLOW_H) $(TREE_PASS_H) $(TREE_DUMP_H) langhooks.h $(FLAGS_H) \
    $(DIAGNOSTIC_H) $(TIMEVAR_H) pointer-set.h domwalk.h $(CFGLOOP_H) \
-   $(TREE_DATA_REF_H) $(TREE_PRETTY_PRINT_H)
+   $(TREE_DATA_REF_H) $(TREE_PRETTY_PRINT_H) $(GIMPLE_PRETTY_PRINT_H) \
+   insn-config.h $(EXPR_H) $(OPTABS_H)
 tree-nrv.o : tree-nrv.c $(CONFIG_H) $(SYSTEM_H) coretypes.h \
    $(TM_H) $(TREE_H) $(FUNCTION_H) $(BASIC_BLOCK_H) $(FLAGS_H) \
    $(DIAGNOSTIC_H) $(TREE_FLOW_H) $(TIMEVAR_H) $(TREE_DUMP_H) $(TREE_PASS_H) \

gcc/common.opt

@@ -1186,6 +1186,11 @@ fgraphite-identity
 Common Report Var(flag_graphite_identity) Optimization
 Enable Graphite Identity transformation
 
+fhoist-adjacent-loads
+Common Report Var(flag_hoist_adjacent_loads) Optimization
+Enable hoisting adjacent loads to encourage generating conditional move
+instructions
+
 floop-parallelize-all
 Common Report Var(flag_loop_parallelize_all) Optimization
 Mark all loops as parallel

gcc/opts.c

@@ -489,6 +489,7 @@ static const struct default_options default_options_table[] =
     { OPT_LEVELS_2_PLUS, OPT_falign_functions, NULL, 1 },
     { OPT_LEVELS_2_PLUS, OPT_ftree_tail_merge, NULL, 1 },
     { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_foptimize_strlen, NULL, 1 },
+    { OPT_LEVELS_2_PLUS, OPT_fhoist_adjacent_loads, NULL, 1 },
 
     /* -O3 optimizations.  */
     { OPT_LEVELS_3_PLUS, OPT_ftree_loop_distribute_patterns, NULL, 1 },