2011-9-17 13:39:38

 

2011-9-17 13:39:38

static inline int tcg_global_reg_new_internal(TCGType type, int reg,
                                              const char *name)
{
    TCGContext *s = &tcg_ctx;
    TCGTemp *ts;
    int idx;

#if TCG_TARGET_REG_BITS == 32
    if (type != TCG_TYPE_I32)
        tcg_abort();
#endif
    if (tcg_regset_test_reg(s->reserved_regs, reg))
        tcg_abort();
    idx = s->nb_globals;
    tcg_temp_alloc(s, s->nb_globals + 1);
    ts = &s->temps[s->nb_globals];
    ts->base_type = type;
    ts->type = type;
    ts->fixed_reg = 1;
    ts->reg = reg;
    ts->name = name;
    s->nb_globals++;
    tcg_regset_set_reg(s->reserved_regs, reg);
    return idx;
}

全局寄存器只有一份！！！

/* XXX: optimize memory layout */
typedef struct TCGTemp {
    TCGType base_type;
    TCGType type;
    int val_type;
    int reg;
    tcg_target_long val;
    int mem_reg;
    tcg_target_long mem_offset;
    unsigned int fixed_reg:1;
    unsigned int mem_coherent:1;
    unsigned int mem_allocated:1;
    unsigned int temp_local:1; /* If true, the temp is saved accross
                                  basic blocks. Otherwise, it is not
                                  preserved accross basic blocks. */
    unsigned int temp_allocated:1; /* never used for code gen */
    /* index of next free temp of same base type, -1 if end */
    int next_free_temp;
    const char *name;
} TCGTemp;

temp的结构体 看看

void arm_translate_init(void)
{
    cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");

    cpu_T[0] = tcg_global_reg_new_i32(TCG_AREG1, "T0");
    cpu_T[1] = tcg_global_reg_new_i32(TCG_AREG2, "T1");

#define GEN_HELPER 2
#include "helpers.h"
}

得到的也是数组下标