arm.c (params.h): Include.

	* config/arm/arm.c (params.h): Include.
	(arm_override_options): Tune gcse-unrestricted-cost.
	* config/arm/t-arm (arm.o): Define dependencies.

From-SVN: r162598

gcc/ChangeLog

 2010-07-27  Maxim Kuvyrkov  <maxim@codesourcery.com>
 
+	* config/arm/arm.c (params.h): Include.
+	(arm_override_options): Tune gcse-unrestricted-cost.
+	* config/arm/t-arm (arm.o): Define dependencies.
+
+2010-07-27  Maxim Kuvyrkov  <maxim@codesourcery.com>
+
 	PR target/42495
 	PR middle-end/42574
 	* basic-block.h (get_dominated_to_depth): Declare.

gcc/config/arm/arm.c

@@ -56,6 +56,7 @@
 #include "df.h"
 #include "intl.h"
 #include "libfuncs.h"
+#include "params.h"
 
 /* Forward definitions of types.  */
 typedef struct minipool_node    Mnode;
@@ -1872,6 +1873,14 @@ arm_override_options (void)
       flag_reorder_blocks = 1;
     }
 
+  if (!PARAM_SET_P (PARAM_GCSE_UNRESTRICTED_COST)
+      && flag_pic)
+    /* Hoisting PIC address calculations more aggressively provides a small,
+       but measurable, size reduction for PIC code.  Therefore, we decrease
+       the bar for unrestricted expression hoisting to the cost of PIC address
+       calculation, which is 2 instructions.  */
+    set_param_value ("gcse-unrestricted-cost", 2);
+
   /* Register global variables with the garbage collector.  */
   arm_add_gc_roots ();
 }

gcc/config/arm/t-arm

@@ -45,6 +45,15 @@ $(srcdir)/config/arm/arm-tune.md: $(srcdir)/config/arm/gentune.sh \
 		$(srcdir)/config/arm/arm-cores.def > \
 		$(srcdir)/config/arm/arm-tune.md
 
+arm.o: $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) \
+  $(RTL_H) $(TREE_H) $(OBSTACK_H) $(REGS_H) hard-reg-set.h \
+  insn-config.h conditions.h output.h \
+  $(INSN_ATTR_H) $(FLAGS_H) reload.h $(FUNCTION_H) \
+  $(EXPR_H) $(OPTABS_H) toplev.h $(RECOG_H) $(CGRAPH_H) \
+  $(GGC_H) except.h $(C_PRAGMA_H) $(INTEGRATE_H) $(TM_P_H) \
+  $(TARGET_H) $(TARGET_DEF_H) debug.h langhooks.h $(DF_H) \
+  intl.h libfuncs.h $(PARAMS_H)
+
 arm-c.o: $(srcdir)/config/arm/arm-c.c $(CONFIG_H) $(SYSTEM_H) \
     coretypes.h $(TM_H) $(TREE_H) output.h $(C_COMMON_H)
 	$(COMPILER) -c $(ALL_COMPILERFLAGS) $(ALL_CPPFLAGS) $(INCLUDES) \