regrename.h File Reference

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Data Structures
struct	du_head
struct	du_chain
struct	operand_rr_info
struct	insn_rr_info

Typedefs
typedef struct du_head *	du_head_p

Functions
void	regrename_init (bool)
void	regrename_finish (void)
void	regrename_analyze (bitmap)
du_head_p	regrename_chain_from_id (unsigned int)
int	find_best_rename_reg (du_head_p, enum reg_class, HARD_REG_SET *, int)
void	regrename_do_replace (du_head_p, int)

Variables
vec< insn_rr_info >	insn_rr

---

Typedef Documentation

typedef struct du_head* du_head_p

---

Function Documentation

int find_best_rename_reg	(	du_head_p	this_head,
		enum reg_class	super_class,
		HARD_REG_SET *	unavailable,
		int	old_reg
	)

   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.  

     Further narrow the set of registers we can use for renaming.
     If the chain needs a call-saved register, mark the call-used
     registers as unavailable.  

     Mark registers that overlap this chain's lifetime as unavailable.  

     Compute preferred rename class of super union of all the classes
     in the chain.  

     If PREFERRED_CLASS is not NO_REGS, we iterate in the first pass
     over registers that belong to PREFERRED_CLASS and try to find the
     best register within the class.  If that failed, we iterate in
     the second pass over registers that don't belong to the class.
     If PREFERRED_CLASS is NO_REGS, we iterate over all registers in
     ascending order without any preference.  

             In the first pass, we force the renaming of registers that
             don't belong to PREFERRED_CLASS to registers that do, even
             though the latters were used not very long ago.  

References check_new_reg_p(), and tick.

void regrename_analyze

(

bitmap

)

du_head_p regrename_chain_from_id

(

unsigned

int

)

void regrename_do_replace	(	du_head_p	,
		int
	)

void regrename_finish

(

void

)

   Free all global data used by the register renamer.  

void regrename_init

(

bool

)

---

Variable Documentation

vec<insn_rr_info> insn_rr

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