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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>
This commit is contained in:
Pavel Dovgalyuk 2019-07-25 11:44:55 +03:00 committed by Paolo Bonzini
parent ba3e792669
commit 9e9b10c649
18 changed files with 7 additions and 102 deletions
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1
accel/tcg/translator.c
View File

@ -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);
}

8
include/exec/gen-icount.h
View File

@ -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();
}

2
target/alpha/translate.c
View File

@ -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);

4
target/arm/translate-a64.c
View File

@ -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;

7
target/arm/translate.c
View File

@ -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;

2
target/cris/translate.c
View File

@ -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

1
target/hppa/translate.c
View File

@ -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);

10
target/i386/translate.c
View File

@ -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 {

9
target/lm32/translate.c
View File

@ -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) {

2
target/microblaze/translate.c
View File

@ -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)) {

11
target/mips/translate.c
View File

@ -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

4
target/nios2/translate.c
View File

@ -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:

13
target/ppc/translate.c
View File

@ -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 */

2
target/ppc/translate_init.inc.c
View File

@ -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);
}
}

1
target/riscv/insn_trans/trans_rvi.inc.c
View File

@ -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); \

16
target/sparc/translate.c
View File

@ -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;
}

1
target/unicore32/translate.c
View File

@ -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

15
target/xtensa/translate.c
View File

@ -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
}