Paolo,



This patch series adds analysis of register usage of functions for usage by IRA.

The original post is here

( http://gcc.gnu.org/ml/gcc-patches/2013-01/msg01234.html ).



This patch uses the information of which registers are clobbered by a call

in IRA and df-scan.



Bootstrapped and reg-tested on x86_64, Ada inclusive. Build and reg-tested on

mips, arm, ppc and sh.



Can you approve the df-scan part for trunk?



Thanks,

  -Tom



2013-03-29  Radovan Obradovic  <robradovic@mips.com>

            Tom de Vries  <tom@codesourcery.com>



	* df-scan.c (df_get_call_refs): Use get_call_reg_set_usage.

	* caller-save.c (setup_save_areas, save_call_clobbered_regs): Use

	get_call_reg_set_usage.

	* resource.c (mark_set_resources, mark_target_live_regs): Use

	get_call_reg_set_usage.

	* ira-int.h (struct ira_allocno): Add crossed_calls_clobbered_regs

	field.

	(ALLOCNO_CROSSED_CALLS_CLOBBERED_REGS): Define.

	* ira-lives.c (process_bb_node_lives): Use get_call_reg_set_usage.

	Calculate ALLOCNO_CROSSED_CALLS_CLOBBERED_REGS.

	* ira-build.c (ira_create_allocno): Init

	ALLOCNO_CROSSED_CALLS_CLOBBERED_REGS.

	(create_cap_allocno, propagate_allocno_info)

	(propagate_some_info_from_allocno)

	(copy_info_to_removed_store_destinations): Handle

	ALLOCNO_CROSSED_CALLS_CLOBBERED_REGS.

	* ira-costs.c (ira_tune_allocno_costs): Use

	ALLOCNO_CROSSED_CALLS_CLOBBERED_REGS to adjust costs.