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#include "register.h"
#include <assert.h>
#include <inttypes.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define REG_NUM 6
#define REG_RESERVED "w9"
#define REG_LOCK_MAX 3
#define REG_SIZE 4
#define SPILL_MAX 64
static char extend_name[8];
static const char *reg_name[REG_NUM] = {
"w10", "w11", "w12", "w13", "w14", "w15"};
CcmmcRegPool *ccmmc_register_init(FILE *asm_output)
{
CcmmcRegPool *pool = malloc(sizeof(CcmmcRegPool));
pool->num = REG_NUM;
pool->list = malloc(sizeof(CcmmcReg*) * pool->num);
for (int i = 0; i < pool->num; i++) {
pool->list[i] = malloc(sizeof(CcmmcReg));
pool->list[i]->tmp = NULL;
pool->list[i]->lock = 0;
pool->list[i]->name = reg_name[i];
}
pool->spill = malloc(sizeof(CcmmcTmp*) * SPILL_MAX);
pool->top = 0;
pool->lock_max = REG_LOCK_MAX;
pool->lock_cnt = 0;
pool->asm_output = asm_output;
return pool;
}
CcmmcTmp *ccmmc_register_alloc(CcmmcRegPool *pool, uint64_t *offset)
{
CcmmcTmp *tmp = malloc(sizeof(CcmmcTmp));
if (pool->top < pool->num) {
// tmp
tmp->addr = 0;
tmp->reg = pool->list[pool->top];
// reg
tmp->reg->tmp = tmp;
tmp->reg->lock = 0;
// pool
pool->top++;
}
else {
// gen code to alloc space on the stack
fprintf(pool->asm_output,
"\t\t/* ccmmc_register_alloc(): */\n"
"\t\tsub\tsp, sp, #%d\n",
REG_SIZE);
// tmp and offset
*offset += REG_SIZE;
tmp->addr = *offset;
tmp->reg = NULL;
// spill
pool->spill[pool->top - pool->num] = tmp;
// pool
pool->top++;
}
return tmp;
}
const char *ccmmc_register_lock(CcmmcRegPool *pool, CcmmcTmp *tmp)
{
const char *reg = NULL;
if (pool->lock_cnt < pool->lock_max) {
if (tmp->reg !=NULL) {
if (tmp->reg->lock == 0) {
// reg
tmp->reg->lock = 1;
// pool
pool->lock_cnt++;
}
reg = tmp->reg->name;
}
else {
// find a unlocked reg
int i, j;
for (i = 0; i < pool->num && pool->list[i]->lock == 1; i++);
assert(i < pool->num); //must found
// gen code to swap the tmp in the register and the tmp on the stack
fprintf(pool->asm_output,
"\t\t/* ccmmc_register_lock(): swap %s, [fp, #-%" PRIu64 "] */\n",
pool->list[i]->name,
tmp->addr);
fprintf(pool->asm_output, "\t\tmov\t%s, %s\n", REG_RESERVED,
pool->list[i]->name);
fprintf(pool->asm_output, "\t\tldr\t%s, [fp, #-%" PRIu64 "]\n",
pool->list[i]->name, tmp->addr);
fprintf(pool->asm_output, "\t\tstr\t%s, [fp, #-%" PRIu64 "]\n",
REG_RESERVED, tmp->addr);
// find the index of tmp in pool->spill
for (j = 0; j < pool->top - pool->num && pool->spill[j] != tmp; j++);
// spill
pool->spill[j] = pool->list[i]->tmp;
// old tmp of the reg
pool->list[i]->tmp->reg = NULL;
pool->list[i]->tmp->addr = tmp->addr;
// tmp
tmp->reg = pool->list[i];
tmp->addr = 0;
// register
tmp->reg->tmp = tmp;
tmp->reg->lock = 1;
// pool
pool->lock_cnt++;
reg = tmp->reg->name;
}
}
return reg;
}
void ccmmc_register_unlock(CcmmcRegPool *pool, CcmmcTmp *tmp)
{
if (tmp->reg != NULL && tmp->reg->lock == 1) {
// reg
tmp->reg->lock = 0;
// pool
pool->lock_cnt--;
}
}
void ccmmc_register_free(CcmmcRegPool *pool, CcmmcTmp *tmp, uint64_t *offset)
{
// find the index of register associated with tmp
int i;
for (i = 0; i < pool->num && pool->list[i] != tmp->reg; i++);
if (pool->top <= pool->num) {
// tmp
free(tmp);
// pool
pool->top--;
assert(i < pool->num); //must found
if (i < pool->top) {
CcmmcReg *swap = pool->list[i];
pool->list[i] = pool->list[pool->top];
pool->list[pool->top] = swap;
}
}
else {
if (i < pool->num) {
// pool
pool->top--;
// gen code to move the last tmp to this register
fprintf(pool->asm_output, "\t\t/* ccmmc_register_free(): */\n");
fprintf(pool->asm_output, "\t\tldr\t%s, [fp, #-%" PRIu64 "]\n",
tmp->reg->name, pool->spill[pool->top - pool->num]->addr);
fprintf(pool->asm_output, "\t\tadd\tsp, sp, #%d\n", REG_SIZE);
// offset
*offset -= REG_SIZE;
// reg
tmp->reg->tmp = pool->spill[pool->top - pool->num];
// the last tmp
tmp->reg->tmp->reg = tmp->reg;
tmp->reg->tmp->addr = 0;
// tmp
free(tmp);
}
else {
// tmp is on the stack, not handled
assert(false);
}
}
}
char *ccmmc_register_extend_name(CcmmcTmp *tmp)
{
if (tmp->reg != NULL) {
strcpy(extend_name, tmp->reg->name);
extend_name[0] = 'x';
return extend_name;
}
return NULL;
}
void ccmmc_register_caller_save(CcmmcRegPool *pool)
{
for (int i = 0; i < REG_NUM; i++)
fprintf(pool->asm_output, "\tstr\t%s, [sp, #-%d]\n",
reg_name[i],
(i + 1) * REG_SIZE);
fprintf(pool->asm_output, "\tsub\tsp, sp, %d\n", REG_NUM * REG_SIZE);
}
void ccmmc_register_caller_load(CcmmcRegPool *pool)
{
fprintf(pool->asm_output, "\tadd\tsp, sp, %d\n", REG_NUM * REG_SIZE);
for (int i = 0; i < REG_NUM; i++)
fprintf(pool->asm_output, "\tldr\t%s, [sp, #-%d]\n",
reg_name[i],
(i + 1) * REG_SIZE);
}
void ccmmc_register_fini(CcmmcRegPool *pool)
{
// TODO: free register pool
}
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