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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(), reg_class_contents, TEST_HARD_REG_BIT, 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.

Data Structures

Typedefs

Functions

Variables

Typedef Documentation

Function Documentation

Variable Documentation