icount: remove unnecessary gen_io_end calls

Prior patch resets can_do_io flag at the TB entry. Therefore there is no
need in resetting this flag at the end of the block.
This patch removes redundant gen_io_end calls.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
Message-Id: <156404429499.18669.13404064982854123855.stgit@pasha-Precision-3630-Tower>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@gmail.com>

18 files changed, 7 insertions, 102 deletions

diff --git a/accel/tcg/translator.c b/accel/tcg/translator.c
index 9226a348a3..70c66c538c 100644
--- a/accel/tcg/translator.c
+++ b/accel/tcg/translator.c
@@ -90,7 +90,6 @@ void translator_loop(const TranslatorOps *ops, DisasContextBase *db,
             /* Accept I/O on the last instruction.  */
             gen_io_start();
             ops->translate_insn(db, cpu);
-            gen_io_end();
         } else {
             ops->translate_insn(db, cpu);
         }
diff --git a/include/exec/gen-icount.h b/include/exec/gen-icount.h
index 4004e6c9d0..822c43cfd3 100644
--- a/include/exec/gen-icount.h
+++ b/include/exec/gen-icount.h
@@ -16,6 +16,13 @@ static inline void gen_io_start(void)
     tcg_temp_free_i32(tmp);
 }
 
+/*
+ * cpu->can_do_io is cleared automatically at the beginning of
+ * each translation block.  The cost is minimal and only paid
+ * for -icount, plus it would be very easy to forget doing it
+ * in the translator.  Therefore, backends only need to call
+ * gen_io_start.
+ */
 static inline void gen_io_end(void)
 {
     TCGv_i32 tmp = tcg_const_i32(0);
@@ -58,7 +65,6 @@ static inline void gen_tb_start(TranslationBlock *tb)
         tcg_gen_st16_i32(count, cpu_env,
                          offsetof(ArchCPU, neg.icount_decr.u16.low) -
                          offsetof(ArchCPU, env));
-        /* Disable I/O by default */
         gen_io_end();
     }
 
diff --git a/target/alpha/translate.c b/target/alpha/translate.c
index 2c9cccf6c1..1e29653aac 100644
--- a/target/alpha/translate.c
+++ b/target/alpha/translate.c
@@ -1332,7 +1332,6 @@ static DisasJumpType gen_mfpr(DisasContext *ctx, TCGv va, int regno)
         if (use_icount) {
             gen_io_start();
             helper(va);
-            gen_io_end();
             return DISAS_PC_STALE;
         } else {
             helper(va);
@@ -2398,7 +2397,6 @@ static DisasJumpType translate_one(DisasContext *ctx, uint32_t insn)
             if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
                 gen_io_start();
                 gen_helper_load_pcc(va, cpu_env);
-                gen_io_end();
                 ret = DISAS_PC_STALE;
             } else {
                 gen_helper_load_pcc(va, cpu_env);
diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index fc3e5f5c38..6fd0b779d3 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -1775,7 +1775,6 @@ static void handle_sys(DisasContext *s, uint32_t insn, bool isread,
 
     if ((tb_cflags(s->base.tb) & CF_USE_ICOUNT) && (ri->type & ARM_CP_IO)) {
         /* I/O operations must end the TB here (whether read or write) */
-        gen_io_end();
         s->base.is_jmp = DISAS_UPDATE;
     } else if (!isread && !(ri->type & ARM_CP_SUPPRESS_TB_END)) {
         /* We default to ending the TB on a coprocessor register write,
@@ -2084,9 +2083,6 @@ static void disas_uncond_b_reg(DisasContext *s, uint32_t insn)
 
         gen_helper_exception_return(cpu_env, dst);
         tcg_temp_free_i64(dst);
-        if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
-            gen_io_end();
-        }
         /* Must exit loop to check un-masked IRQs */
         s->base.is_jmp = DISAS_EXIT;
         return;
diff --git a/target/arm/translate.c b/target/arm/translate.c
index d948757131..cbe19b7a62 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -3213,9 +3213,6 @@ static void gen_rfe(DisasContext *s, TCGv_i32 pc, TCGv_i32 cpsr)
         gen_io_start();
     }
     gen_helper_cpsr_write_eret(cpu_env, cpsr);
-    if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
-        gen_io_end();
-    }
     tcg_temp_free_i32(cpsr);
     /* Must exit loop to check un-masked IRQs */
     s->base.is_jmp = DISAS_EXIT;
@@ -7303,7 +7300,6 @@ static int disas_coproc_insn(DisasContext *s, uint32_t insn)
 
         if ((tb_cflags(s->base.tb) & CF_USE_ICOUNT) && (ri->type & ARM_CP_IO)) {
             /* I/O operations must end the TB here (whether read or write) */
-            gen_io_end();
             gen_lookup_tb(s);
         } else if (!isread && !(ri->type & ARM_CP_SUPPRESS_TB_END)) {
             /* We default to ending the TB on a coprocessor register write,
@@ -9163,9 +9159,6 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn)
                         gen_io_start();
                     }
                     gen_helper_cpsr_write_eret(cpu_env, tmp);
-                    if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
-                        gen_io_end();
-                    }
                     tcg_temp_free_i32(tmp);
                     /* Must exit loop to check un-masked IRQs */
                     s->base.is_jmp = DISAS_EXIT;
diff --git a/target/cris/translate.c b/target/cris/translate.c
index 3429a3b768..e752bd0609 100644
--- a/target/cris/translate.c
+++ b/target/cris/translate.c
@@ -3225,8 +3225,6 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb, int max_insns)
 
     npc = dc->pc;
 
-        if (tb_cflags(tb) & CF_LAST_IO)
-            gen_io_end();
     /* Force an update if the per-tb cpu state has changed.  */
     if (dc->is_jmp == DISAS_NEXT
         && (dc->cpustate_changed || !dc->flagx_known
diff --git a/target/hppa/translate.c b/target/hppa/translate.c
index 188fe688cb..8c6189512c 100644
--- a/target/hppa/translate.c
+++ b/target/hppa/translate.c
@@ -2161,7 +2161,6 @@ static bool trans_mfctl(DisasContext *ctx, arg_mfctl *a)
         if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
             gen_io_start();
             gen_helper_read_interval_timer(tmp);
-            gen_io_end();
             ctx->base.is_jmp = DISAS_IAQ_N_STALE;
         } else {
             gen_helper_read_interval_timer(tmp);
diff --git a/target/i386/translate.c b/target/i386/translate.c
index 03150a86e2..5cd74ad639 100644
--- a/target/i386/translate.c
+++ b/target/i386/translate.c
@@ -5381,7 +5381,6 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
             gen_op_mov_reg_v(s, dflag, rm, s->T0);
             set_cc_op(s, CC_OP_EFLAGS);
             if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
-                gen_io_end();
                 gen_jmp(s, s->pc - s->cs_base);
             }
             break;
@@ -6443,7 +6442,6 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
         gen_op_mov_reg_v(s, ot, R_EAX, s->T1);
         gen_bpt_io(s, s->tmp2_i32, ot);
         if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
-            gen_io_end();
             gen_jmp(s, s->pc - s->cs_base);
         }
         break;
@@ -6464,7 +6462,6 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
         gen_helper_out_func(ot, s->tmp2_i32, s->tmp3_i32);
         gen_bpt_io(s, s->tmp2_i32, ot);
         if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
-            gen_io_end();
             gen_jmp(s, s->pc - s->cs_base);
         }
         break;
@@ -6482,7 +6479,6 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
         gen_op_mov_reg_v(s, ot, R_EAX, s->T1);
         gen_bpt_io(s, s->tmp2_i32, ot);
         if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
-            gen_io_end();
             gen_jmp(s, s->pc - s->cs_base);
         }
         break;
@@ -6502,7 +6498,6 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
         gen_helper_out_func(ot, s->tmp2_i32, s->tmp3_i32);
         gen_bpt_io(s, s->tmp2_i32, ot);
         if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
-            gen_io_end();
             gen_jmp(s, s->pc - s->cs_base);
         }
         break;
@@ -7206,7 +7201,6 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
         }
         gen_helper_rdtsc(cpu_env);
         if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
-            gen_io_end();
             gen_jmp(s, s->pc - s->cs_base);
         }
         break;
@@ -7666,7 +7660,6 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
             }
             gen_helper_rdtscp(cpu_env);
             if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
-                gen_io_end();
                 gen_jmp(s, s->pc - s->cs_base);
             }
             break;
@@ -8036,9 +8029,6 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
                     gen_op_mov_v_reg(s, ot, s->T0, rm);
                     gen_helper_write_crN(cpu_env, tcg_const_i32(reg),
                                          s->T0);
-                    if (tb_cflags(s->base.tb) & CF_USE_ICOUNT) {
-                        gen_io_end();
-                    }
                     gen_jmp_im(s, s->pc - s->cs_base);
                     gen_eob(s);
                 } else {
diff --git a/target/lm32/translate.c b/target/lm32/translate.c
index b9f2f2c4a7..778cae1e81 100644
--- a/target/lm32/translate.c
+++ b/target/lm32/translate.c
@@ -885,9 +885,6 @@ static void dec_wcsr(DisasContext *dc)
         }
         gen_helper_wcsr_im(cpu_env, cpu_R[dc->r1]);
         tcg_gen_movi_tl(cpu_pc, dc->pc + 4);
-        if (tb_cflags(dc->tb) & CF_USE_ICOUNT) {
-            gen_io_end();
-        }
         dc->is_jmp = DISAS_UPDATE;
         break;
     case CSR_IP:
@@ -897,9 +894,6 @@ static void dec_wcsr(DisasContext *dc)
         }
         gen_helper_wcsr_ip(cpu_env, cpu_R[dc->r1]);
         tcg_gen_movi_tl(cpu_pc, dc->pc + 4);
-        if (tb_cflags(dc->tb) & CF_USE_ICOUNT) {
-            gen_io_end();
-        }
         dc->is_jmp = DISAS_UPDATE;
         break;
     case CSR_ICC:
@@ -1111,9 +1105,6 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb, int max_insns)
          && (dc->pc - page_start < TARGET_PAGE_SIZE)
          && num_insns < max_insns);
 
-    if (tb_cflags(tb) & CF_LAST_IO) {
-        gen_io_end();
-    }
 
     if (unlikely(cs->singlestep_enabled)) {
         if (dc->is_jmp == DISAS_NEXT) {
diff --git a/target/microblaze/translate.c b/target/microblaze/translate.c
index 9ce65f3bcf..95ff663292 100644
--- a/target/microblaze/translate.c
+++ b/target/microblaze/translate.c
@@ -1724,8 +1724,6 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb, int max_insns)
             npc = dc->jmp_pc;
     }
 
-    if (tb_cflags(tb) & CF_LAST_IO)
-        gen_io_end();
     /* Force an update if the per-tb cpu state has changed.  */
     if (dc->is_jmp == DISAS_NEXT
         && (dc->cpustate_changed || org_flags != dc->tb_flags)) {
diff --git a/target/mips/translate.c b/target/mips/translate.c
index 1c50e5a8c4..8ebde6ffee 100644
--- a/target/mips/translate.c
+++ b/target/mips/translate.c
@@ -7129,9 +7129,6 @@ static void gen_mfc0(DisasContext *ctx, TCGv arg, int reg, int sel)
                 gen_io_start();
             }
             gen_helper_mfc0_count(arg, cpu_env);
-            if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
-                gen_io_end();
-            }
             /*
              * Break the TB to be able to take timer interrupts immediately
              * after reading count. DISAS_STOP isn't sufficient, we need to
@@ -8296,7 +8293,6 @@ static void gen_mtc0(DisasContext *ctx, TCGv arg, int reg, int sel)
 
     /* For simplicity assume that all writes can cause interrupts.  */
     if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
-        gen_io_end();
         /*
          * DISAS_STOP isn't sufficient, we need to ensure we break out of
          * translated code to check for pending interrupts.
@@ -8607,9 +8603,6 @@ static void gen_dmfc0(DisasContext *ctx, TCGv arg, int reg, int sel)
                 gen_io_start();
             }
             gen_helper_mfc0_count(arg, cpu_env);
-            if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
-                gen_io_end();
-            }
             /*
              * Break the TB to be able to take timer interrupts immediately
              * after reading count. DISAS_STOP isn't sufficient, we need to
@@ -9748,7 +9741,6 @@ static void gen_dmtc0(DisasContext *ctx, TCGv arg, int reg, int sel)
 
     /* For simplicity assume that all writes can cause interrupts.  */
     if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
-        gen_io_end();
         /*
          * DISAS_STOP isn't sufficient, we need to ensure we break out of
          * translated code to check for pending interrupts.
@@ -12817,9 +12809,6 @@ static void gen_rdhwr(DisasContext *ctx, int rt, int rd, int sel)
             gen_io_start();
         }
         gen_helper_rdhwr_cc(t0, cpu_env);
-        if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
-            gen_io_end();
-        }
         gen_store_gpr(t0, rt);
         /*
          * Break the TB to be able to take timer interrupts immediately
diff --git a/target/nios2/translate.c b/target/nios2/translate.c
index 17d8f1877c..e17656e66f 100644
--- a/target/nios2/translate.c
+++ b/target/nios2/translate.c
@@ -862,10 +862,6 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb, int max_insns)
              !tcg_op_buf_full() &&
              num_insns < max_insns);
 
-    if (tb_cflags(tb) & CF_LAST_IO) {
-        gen_io_end();
-    }
-
     /* Indicate where the next block should start */
     switch (dc->is_jmp) {
     case DISAS_NEXT:
diff --git a/target/ppc/translate.c b/target/ppc/translate.c
index 9f9553afb4..2a9d13f7e5 100644
--- a/target/ppc/translate.c
+++ b/target/ppc/translate.c
@@ -1861,7 +1861,6 @@ static void gen_darn(DisasContext *ctx)
             gen_helper_darn64(cpu_gpr[rD(ctx->opcode)]);
         }
         if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
-            gen_io_end();
             gen_stop_exception(ctx);
         }
     }
@@ -3991,9 +3990,6 @@ static void gen_rfi(DisasContext *ctx)
     gen_update_cfar(ctx, ctx->base.pc_next - 4);
     gen_helper_rfi(cpu_env);
     gen_sync_exception(ctx);
-    if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
-        gen_io_end();
-    }
 #endif
 }
 
@@ -4011,9 +4007,6 @@ static void gen_rfid(DisasContext *ctx)
     gen_update_cfar(ctx, ctx->base.pc_next - 4);
     gen_helper_rfid(cpu_env);
     gen_sync_exception(ctx);
-    if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
-        gen_io_end();
-    }
 #endif
 }
 
@@ -4389,9 +4382,6 @@ static void gen_mtmsrd(DisasContext *ctx)
         /* Must stop the translation as machine state (may have) changed */
         /* Note that mtmsr is not always defined as context-synchronizing */
         gen_stop_exception(ctx);
-        if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
-            gen_io_end();
-        }
     }
 #endif /* !defined(CONFIG_USER_ONLY) */
 }
@@ -4429,9 +4419,6 @@ static void gen_mtmsr(DisasContext *ctx)
         tcg_gen_mov_tl(msr, cpu_gpr[rS(ctx->opcode)]);
 #endif
         gen_helper_store_msr(cpu_env, msr);
-        if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
-            gen_io_end();
-        }
         tcg_temp_free(msr);
         /* Must stop the translation as machine state (may have) changed */
         /* Note that mtmsr is not always defined as context-synchronizing */
diff --git a/target/ppc/translate_init.inc.c b/target/ppc/translate_init.inc.c
index 86fc8f2e31..66d9a732e0 100644
--- a/target/ppc/translate_init.inc.c
+++ b/target/ppc/translate_init.inc.c
@@ -189,7 +189,6 @@ static void spr_read_decr(DisasContext *ctx, int gprn, int sprn)
     }
     gen_helper_load_decr(cpu_gpr[gprn], cpu_env);
     if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
-        gen_io_end();
         gen_stop_exception(ctx);
     }
 }
@@ -201,7 +200,6 @@ static void spr_write_decr(DisasContext *ctx, int sprn, int gprn)
     }
     gen_helper_store_decr(cpu_env, cpu_gpr[gprn]);
     if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
-        gen_io_end();
         gen_stop_exception(ctx);
     }
 }
diff --git a/target/riscv/insn_trans/trans_rvi.inc.c b/target/riscv/insn_trans/trans_rvi.inc.c
index ea6473111c..1af795e05d 100644
--- a/target/riscv/insn_trans/trans_rvi.inc.c
+++ b/target/riscv/insn_trans/trans_rvi.inc.c
@@ -511,7 +511,6 @@ static bool trans_fence_i(DisasContext *ctx, arg_fence_i *a)
 } while (0)
 
 #define RISCV_OP_CSR_POST do {\
-    gen_io_end(); \
     gen_set_gpr(a->rd, dest); \
     tcg_gen_movi_tl(cpu_pc, ctx->pc_succ_insn); \
     exit_tb(ctx); \
diff --git a/target/sparc/translate.c b/target/sparc/translate.c
index 091bab53af..02c16128c8 100644
--- a/target/sparc/translate.c
+++ b/target/sparc/translate.c
@@ -4412,10 +4412,6 @@ static void disas_sparc_insn(DisasContext * dc, unsigned int insn)
                                     gen_helper_tick_set_limit(r_tickptr,
                                                               cpu_tick_cmpr);
                                     tcg_temp_free_ptr(r_tickptr);
-                                    if (tb_cflags(dc->base.tb) &
-                                           CF_USE_ICOUNT) {
-                                        gen_io_end();
-                                    }
                                     /* End TB to handle timer interrupt */
                                     dc->base.is_jmp = DISAS_EXIT;
                                 }
@@ -4440,10 +4436,6 @@ static void disas_sparc_insn(DisasContext * dc, unsigned int insn)
                                     gen_helper_tick_set_count(r_tickptr,
                                                               cpu_tmp0);
                                     tcg_temp_free_ptr(r_tickptr);
-                                    if (tb_cflags(dc->base.tb) &
-                                           CF_USE_ICOUNT) {
-                                        gen_io_end();
-                                    }
                                     /* End TB to handle timer interrupt */
                                     dc->base.is_jmp = DISAS_EXIT;
                                 }
@@ -4468,10 +4460,6 @@ static void disas_sparc_insn(DisasContext * dc, unsigned int insn)
                                     gen_helper_tick_set_limit(r_tickptr,
                                                               cpu_stick_cmpr);
                                     tcg_temp_free_ptr(r_tickptr);
-                                    if (tb_cflags(dc->base.tb) &
-                                           CF_USE_ICOUNT) {
-                                        gen_io_end();
-                                    }
                                     /* End TB to handle timer interrupt */
                                     dc->base.is_jmp = DISAS_EXIT;
                                 }
@@ -4588,10 +4576,6 @@ static void disas_sparc_insn(DisasContext * dc, unsigned int insn)
                                     gen_helper_tick_set_count(r_tickptr,
                                                               cpu_tmp0);
                                     tcg_temp_free_ptr(r_tickptr);
-                                    if (tb_cflags(dc->base.tb) &
-                                           CF_USE_ICOUNT) {
-                                        gen_io_end();
-                                    }
                                     /* End TB to handle timer interrupt */
                                     dc->base.is_jmp = DISAS_EXIT;
                                 }
diff --git a/target/unicore32/translate.c b/target/unicore32/translate.c
index d27451eed3..0e01f35856 100644
--- a/target/unicore32/translate.c
+++ b/target/unicore32/translate.c
@@ -1931,7 +1931,6 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb, int max_insns)
                code.  */
             cpu_abort(cs, "IO on conditional branch instruction");
         }
-        gen_io_end();
     }
 
     /* At this stage dc->condjmp will only be set when the skipped
diff --git a/target/xtensa/translate.c b/target/xtensa/translate.c
index fa12a576b2..d20e60ce77 100644
--- a/target/xtensa/translate.c
+++ b/target/xtensa/translate.c
@@ -539,9 +539,6 @@ static void gen_waiti(DisasContext *dc, uint32_t imm4)
         gen_io_start();
     }
     gen_helper_waiti(cpu_env, pc, intlevel);
-    if (tb_cflags(dc->base.tb) & CF_USE_ICOUNT) {
-        gen_io_end();
-    }
     tcg_temp_free(pc);
     tcg_temp_free(intlevel);
 }
@@ -2215,9 +2212,6 @@ static void translate_rsr_ccount(DisasContext *dc, const OpcodeArg arg[],
     }
     gen_helper_update_ccount(cpu_env);
     tcg_gen_mov_i32(arg[0].out, cpu_SR[par[0]]);
-    if (tb_cflags(dc->base.tb) & CF_USE_ICOUNT) {
-        gen_io_end();
-    }
 #endif
 }
 
@@ -2607,9 +2601,6 @@ static void translate_wsr_ccompare(DisasContext *dc, const OpcodeArg arg[],
     tcg_gen_mov_i32(cpu_SR[par[0]], arg[0].in);
     gen_helper_update_ccompare(cpu_env, tmp);
     tcg_temp_free(tmp);
-    if (tb_cflags(dc->base.tb) & CF_USE_ICOUNT) {
-        gen_io_end();
-    }
 #endif
 }
 
@@ -2621,9 +2612,6 @@ static void translate_wsr_ccount(DisasContext *dc, const OpcodeArg arg[],
         gen_io_start();
     }
     gen_helper_wsr_ccount(cpu_env, arg[0].in);
-    if (tb_cflags(dc->base.tb) & CF_USE_ICOUNT) {
-        gen_io_end();
-    }
 #endif
 }
 
@@ -2830,9 +2818,6 @@ static void translate_xsr_ccount(DisasContext *dc, const OpcodeArg arg[],
     tcg_gen_mov_i32(arg[0].out, tmp);
     tcg_temp_free(tmp);
 
-    if (tb_cflags(dc->base.tb) & CF_USE_ICOUNT) {
-        gen_io_end();
-    }
 #endif
 }