regrename.h File Reference

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Data Structures
class	du_head
struct	du_chain
struct	operand_rr_info
struct	insn_rr_info

Typedefs
typedef class du_head *	du_head_p

Functions
void	regrename_init (bool)
void	regrename_finish (void)
void	regrename_analyze (bitmap, bool=true)
du_head_p	regrename_chain_from_id (unsigned int)
int	find_rename_reg (du_head_p, enum reg_class, HARD_REG_SET *, int, bool)
bool	regrename_do_replace (du_head_p, int)
reg_class	regrename_find_superclass (du_head_p, int *, HARD_REG_SET *)

Variables
vec< insn_rr_info >	insn_rr

Typedef Documentation

du_head_p

typedef class du_head* du_head_p

Function Documentation

find_rename_reg()

int find_rename_reg ( du_head_p this_head, enum reg_class super_class, HARD_REG_SET * unavailable, int old_reg, bool best_rename )

extern

For the chain THIS_HEAD, compute and return the best register to
rename to.  SUPER_CLASS is the superunion of register classes in
the chain.  UNAVAILABLE is a set of registers that cannot be used.
OLD_REG is the register currently used for the chain.  BEST_RENAME
controls whether the register chosen must be better than the
current one or just respect the given constraint.   

References check_new_reg_p(), DEBUG_INSN_P, merge_overlapping_regs(), du_chain::next_use, noop_move_p(), reg_class_contents, targetm, TEST_HARD_REG_BIT, and tick.

Referenced by rename_chains().

regrename_analyze()

void regrename_analyze ( bitmap bb_mask, bool include_all_block_p )

extern

Analyze the current function and build chains for renaming.
If INCLUDE_ALL_BLOCKS_P is set to true, process all blocks,
ignoring BB_DISABLE_SCHEDULE.  The default value is true.   

References basic_block_def::aux, BASIC_BLOCK_FOR_FN, bb_rename_info::bb, bitmap_bit_p, bitmap_clear(), bitmap_copy(), bitmap_default_obstack, bitmap_initialize(), build_def_use(), cfun, current_id, df_get_live_in(), df_get_live_out(), dump_def_use_chain(), dump_file, EXECUTE_IF_SET_IN_BITMAP, basic_block_def::flags, FOR_BB_INSNS, FOR_EACH_BB_FN, FOR_EACH_EDGE, free(), i, du_head::id, id_to_chain, bb_rename_info::incoming_open_chains_set, basic_block_def::index, init_rename_info(), insn_rr, INSN_UID(), last_basic_block_for_fn, merge_chains(), n_basic_blocks_for_fn, du_head::nregs, NULL, insn_rr_info::op_info, open_chains, bb_rename_info::open_chains_set, open_chains_set, pre_and_rev_post_order_compute(), basic_block_def::preds, range_overlaps_hard_reg_set_p(), reg_names, REG_SET_TO_HARD_REG_SET, du_head::regno, regrename_chain_from_id(), set_incoming_from_chain(), and basic_block_def::succs.

Referenced by regrename_optimize().

regrename_chain_from_id()

du_head_p regrename_chain_from_id ( unsigned int id )

extern

Return the chain corresponding to id number ID.  Take into account that
chains may have been merged.   

References du_head::id, and id_to_chain.

Referenced by merge_overlapping_regs(), and regrename_analyze().

regrename_do_replace()

bool regrename_do_replace ( du_head_p , int  )

extern

regrename_find_superclass()

reg_class regrename_find_superclass ( du_head_p head, int * pn_uses, HARD_REG_SET * punavailable )

extern

Iterate over elements in the chain HEAD in order to:
1. Count number of uses, storing it in *PN_USES.
2. Narrow the set of registers we can use for renaming, adding
   unavailable registers to *PUNAVAILABLE, which must be
   initialized by the caller.
3. Compute the superunion of register classes in this chain
   and return it.   

References DEBUG_INSN_P, head::first, and reg_class_superunion.

Referenced by rename_chains().

regrename_finish()

void regrename_finish ( void )

extern

Free all global data used by the register renamer.   

References free_chain_data(), insn_rr, NULL, and rename_obstack.

Referenced by regrename_optimize().

regrename_init()

void regrename_init ( bool insn_info )

extern

Initialize the register renamer.  If INSN_INFO is true, ensure that
insn_rr is nonnull.   

References gcc_obstack_init, get_max_uid(), insn_rr, and rename_obstack.

Referenced by regrename_optimize().

Variable Documentation

insn_rr

vec<insn_rr_info> insn_rr

extern

If nonnull, the code calling into the register renamer requested
information about insn operands, and we store it here.   

Referenced by build_def_use(), regrename_analyze(), regrename_finish(), and regrename_init().