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      1 /* Helpers for instruction counting code generation.  */
      2 
      3 static TCGArg *icount_arg;
      4 static int icount_label;
      5 
      6 static inline void gen_icount_start(void)
      7 {
      8     TCGv_i32 count;
      9 
     10     if (!use_icount)
     11         return;
     12 
     13     icount_label = gen_new_label();
     14     count = tcg_temp_local_new_i32();
     15     tcg_gen_ld_i32(count, cpu_env, offsetof(CPUState, icount_decr.u32));
     16     /* This is a horrid hack to allow fixing up the value later.  */
     17     icount_arg = gen_opparam_ptr + 1;
     18     tcg_gen_subi_i32(count, count, 0xdeadbeef);
     19 
     20     tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, icount_label);
     21     tcg_gen_st16_i32(count, cpu_env, offsetof(CPUState, icount_decr.u16.low));
     22     tcg_temp_free_i32(count);
     23 }
     24 
     25 static void gen_icount_end(TranslationBlock *tb, int num_insns)
     26 {
     27     if (use_icount) {
     28         *icount_arg = num_insns;
     29         gen_set_label(icount_label);
     30         tcg_gen_exit_tb((long)tb + 2);
     31     }
     32 }
     33 
     34 static inline void gen_io_start(void)
     35 {
     36     TCGv_i32 tmp = tcg_const_i32(1);
     37     tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUState, can_do_io));
     38     tcg_temp_free_i32(tmp);
     39 }
     40 
     41 static inline void gen_io_end(void)
     42 {
     43     TCGv_i32 tmp = tcg_const_i32(0);
     44     tcg_gen_st_i32(tmp, cpu_env, offsetof(CPUState, can_do_io));
     45     tcg_temp_free_i32(tmp);
     46 }
     47