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#include "stack-man.h"
#include "simplex86.h"
typedef struct reg_alloc_t reg_alloc_t;
typedef struct reg_group_t reg_group_t;
typedef struct reg_pool_t reg_pool_t;
#define MAX_REGISTERS (16)
#define MAX_GROUPS (16)
struct reg_pool_t
{
int n_registers;
int register_size;
op_t reg_reg_instruction;
reg_t registers[MAX_REGISTERS];
};
struct reg_group_t
{
const char *name;
int allocated[MAX_REGISTERS];
int spill_offset[MAX_REGISTERS]; /* -1 if not spilled */
};
struct reg_alloc_t
{
const reg_pool_t *reg_pool;
reg_group_t groups[MAX_GROUPS];
reg_group_t *active;
};
void
reg_alloc_init (reg_alloc_t *ra,
stack_man_t *stack,
const reg_pool_t *reg_pool);
void
reg_alloc_switch_group (reg_alloc_t *ra, const char *name);
void
reg_alloc_free_group (reg_alloc_t *ra, const char *name);
/* After switching back to a group, this should be called for
* all registers that will be used again before switching away.
*/
void
reg_alloc_reload (reg_alloc_t *ra, reg_t *reg, ...);
/* allocate some register within the current group */
reg_t
reg_alloc_alloc (reg_alloc_t *ra);
/* @reg becomes allocated in the current group, though it
* may be moved to another register
*/
reg_t
reg_alloc_preserve (reg_alloc_t *ra, reg_t reg);
void
reg_alloc_free (reg_alloc_t *ra, reg_t reg);
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