* Makefile.in (flow.o): Depend on TREE_H.
	* basic-block.h (REG_SET_EQUAL_P): New.
	(XOR_REG_SET): New.
	(n_edges): Declare.
	(free_regset_vector): Remove declaration.
	(flow_delete_insn_chain): Declare.
	(enum update_life_extent): New.
	(update_life_info, count_or_remove_death_notes): Declare.
	* combine.c (distribute_notes) [REG_DEAD]: Stop search at bb->head.
	Verify register live at bb->global_live_at_start before adding USE.
	* flow.c (HAVE_epilogue, HAVE_prologue): Provide default.
	(CLEAN_ALLOCA): New.
	(n_edges): New.
	(PROP_*): New flags.
	(find_basic_blocks_1): Use alloc_EXPR_LIST.
	(clear_edges): Zero n_edges.
	(make_edge): Increment n_edges.
	(split_edge): Don't allocate bb->local_set.  Increment n_edges.
	(flow_delete_insn_chain): Export.
	(delete_block): Decrement n_edges.
	(merge_blocks_nomove): Likewise.
	(life_analysis): Give life_analysis_1 PROP flags.
	(verify_wide_reg_1, verify_wide_reg): New.
	(verify_local_live_at_start): New.
	(update_life_info): Rewrite to call into propogate_block.
	(mark_reg): New.
	(mark_regs_live_at_end): After reload, if epilogue as rtl,
	always mark stack pointer.  Conditionally mark PIC register.
	After reload, mark call-saved registers, return regsiters.
	(life_analysis_1): Accept PROP flags not remove_dead_code.
	Call mark_regs_live_at_end before zeroing regs_ever_live.
	Use calculate_global_regs_live.  Copy global_live_at_end before
	calling final propagate_block.  Zero reg_next_use on exit.
	(calculate_global_regs_live): New.
	(allocate_bb_life_data): Don't allocate bb->local_set.
	(init_regset_vector, free_regset_vector): Remove.
	(propagate_block): Accept FLAGS not FINAL or REMOVE_DEAD_CODE.
	Test flags before every operation.  Warn if prologue/epilogue insn
	would have been deleted.
	(mark_set_regs, mark_set_1): Accept and use FLAGS.
	Use alloc_EXPR_LIST.
	(mark_used_regs): Accept and use FLAGS, not FINAL.
	Remove special handling for RETURN.
	(try_pre_increment): Use alloc_EXPR_LIST.
	(dump_flow_info): Dump n_edges.
	(unlink_insn_chain, split_hard_reg_notes): Remove.
	(maybe_add_dead_note, maybe_add_dead_note_use): Remove.
	(find_insn_with_note, new_insn_dead_notes): Remove.
	(update_n_sets, sets_reg_or_subreg_1, sets_reg_or_subreg): Remove.
	(maybe_remove_dead_notes, prepend_reg_notes): Remove.
	(replace_insns): Remove.
	(count_or_remove_death_notes): New.
	(verify_flow_info): Abort on error after all checks.
	(remove_edge): Decrement n_edges.
	(remove_fake_edges): Tweek format.
	* haifa-sched.c (schedule_insns): Use split_all_insns.
	* output.h (update_life_info): Remove declaration.
	* recog.c (split_all_insns): From the corpse of split_block_insns,
	do the whole function block by block.  Use update_life_info.
	(recog_last_allowed_insn): New.
	(recog_next_insn): Mind it.
	(peephole2_optimize): Set it.  Walk backwards through blocks.
	Use update_life_info.
	* rtl.h (update_flow_info, replace_insns): Remove declarations.
	(split_all_insns): Declare.
	* toplev.c (rest_of_compilation): Thread prologue before flow2.
	Use split_all_insns.

	* i386.md (or -1 peep2s): Disable.

From-SVN: r29877