broken out of build_def_use.
(build_def_use): Call them as necessary.
+ * regrename.c (struct du_head): New members id, conflicts,
+ hard_conflicts and cannot_rename.
+ (enum scan_actions): Remove terminate_all_read and
+ terminate_overlapping_read; add mark_all_read.
+ (scan_actions_name): Likewise.
+ (du_head_p): New typedef. Define a vector type for it.
+ (id_to_chain): New static variable.
+ (note_sets, clear_dead_regs): Delete functions.
+ (free_chain_data): New function.
+ (merge_overlapping_regs): Simply walk the conflicts bitmap.
+ Remove argument B, all callers changed.
+ (regrename_optimize): Allocate id_to_chain. Ignore chains that have
+ the cannot_rename bit set. Update regno and nregs of a renamed chain.
+ Call free_chain_data when done.
+ (do_replace): Remove death notes when the renamed reg is set in the
+ last insn; add them if not.
+ (mark_conflict, note_sets_clobbers): New static function.
+ (fail_current_block, current_id, open_chains_set, live_hard_regs): New
+ static variables.
+ (scan_rtx_reg): Keep track of conflicts between chains, and between
+ chains and hard regs. Don't terminate chains when we find a read we
+ can't handle, mark it unrenameable instead. For terminate_write,
+ terminate chains that are written with an exact match or a superset
+ of registers. Set fail_current_block if multi-word lifetimes are too
+ complex to handle.
+ (scan_rtx_address): Use mark_all_read instead of terminate_all_read.
+ (build_def_use): Initialize current_id, live_chains and live_hard_regs;
+ free memory for them when done.
+ Rearrange the steps so that earlyclobbers are noted before reads
+ are processed. Add new steps to keep track of hard register lifetimes
+ outside insn operands.
+
2009-11-26 Richard Guenther <rguenther@suse.de>
* tree-ssa-dce.c (nr_walks): New variable.
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