accel/tcg: Track current value of can_do_io in the TB
Simplify translator_io_start by recording the current known value of can_do_io within DisasContextBase. Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> (cherry picked from commit 0ca41ccf1c555f97873b8e02a47390fd6af4b18f) Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
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de11111ee8
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a98097d3a9
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@ -16,11 +16,14 @@
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#include "tcg/tcg-op-common.h"
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#include "tcg/tcg-op-common.h"
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#include "internal.h"
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#include "internal.h"
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static void gen_io_start(void)
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static void set_can_do_io(DisasContextBase *db, bool val)
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{
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{
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tcg_gen_st_i32(tcg_constant_i32(1), cpu_env,
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if (db->saved_can_do_io != val) {
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offsetof(ArchCPU, parent_obj.can_do_io) -
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db->saved_can_do_io = val;
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offsetof(ArchCPU, env));
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tcg_gen_st_i32(tcg_constant_i32(val), cpu_env,
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offsetof(ArchCPU, parent_obj.can_do_io) -
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offsetof(ArchCPU, env));
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}
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}
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}
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bool translator_io_start(DisasContextBase *db)
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bool translator_io_start(DisasContextBase *db)
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@ -30,12 +33,8 @@ bool translator_io_start(DisasContextBase *db)
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if (!(cflags & CF_USE_ICOUNT)) {
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if (!(cflags & CF_USE_ICOUNT)) {
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return false;
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return false;
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}
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}
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if (db->num_insns == db->max_insns && (cflags & CF_LAST_IO)) {
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/* Already started in translator_loop. */
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return true;
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}
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gen_io_start();
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set_can_do_io(db, true);
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/*
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/*
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* Ensure that this instruction will be the last in the TB.
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* Ensure that this instruction will be the last in the TB.
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@ -47,7 +46,7 @@ bool translator_io_start(DisasContextBase *db)
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return true;
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return true;
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}
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}
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static TCGOp *gen_tb_start(uint32_t cflags)
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static TCGOp *gen_tb_start(DisasContextBase *db, uint32_t cflags)
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{
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{
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TCGv_i32 count = NULL;
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TCGv_i32 count = NULL;
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TCGOp *icount_start_insn = NULL;
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TCGOp *icount_start_insn = NULL;
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@ -91,12 +90,9 @@ static TCGOp *gen_tb_start(uint32_t cflags)
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* cpu->can_do_io is cleared automatically here at the beginning of
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* cpu->can_do_io is cleared automatically here at the beginning of
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* each translation block. The cost is minimal and only paid for
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* each translation block. The cost is minimal and only paid for
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* -icount, plus it would be very easy to forget doing it in the
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* -icount, plus it would be very easy to forget doing it in the
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* translator. Doing it here means we don't need a gen_io_end() to
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* translator.
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* go with gen_io_start().
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*/
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*/
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tcg_gen_st_i32(tcg_constant_i32(0), cpu_env,
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set_can_do_io(db, false);
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offsetof(ArchCPU, parent_obj.can_do_io) -
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offsetof(ArchCPU, env));
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}
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}
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return icount_start_insn;
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return icount_start_insn;
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@ -147,6 +143,7 @@ void translator_loop(CPUState *cpu, TranslationBlock *tb, int *max_insns,
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db->num_insns = 0;
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db->num_insns = 0;
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db->max_insns = *max_insns;
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db->max_insns = *max_insns;
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db->singlestep_enabled = cflags & CF_SINGLE_STEP;
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db->singlestep_enabled = cflags & CF_SINGLE_STEP;
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db->saved_can_do_io = -1;
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db->host_addr[0] = host_pc;
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db->host_addr[0] = host_pc;
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db->host_addr[1] = NULL;
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db->host_addr[1] = NULL;
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@ -154,7 +151,7 @@ void translator_loop(CPUState *cpu, TranslationBlock *tb, int *max_insns,
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tcg_debug_assert(db->is_jmp == DISAS_NEXT); /* no early exit */
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tcg_debug_assert(db->is_jmp == DISAS_NEXT); /* no early exit */
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/* Start translating. */
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/* Start translating. */
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icount_start_insn = gen_tb_start(cflags);
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icount_start_insn = gen_tb_start(db, cflags);
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ops->tb_start(db, cpu);
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ops->tb_start(db, cpu);
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tcg_debug_assert(db->is_jmp == DISAS_NEXT); /* no early exit */
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tcg_debug_assert(db->is_jmp == DISAS_NEXT); /* no early exit */
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@ -181,7 +178,7 @@ void translator_loop(CPUState *cpu, TranslationBlock *tb, int *max_insns,
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the next instruction. */
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the next instruction. */
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if (db->num_insns == db->max_insns && (cflags & CF_LAST_IO)) {
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if (db->num_insns == db->max_insns && (cflags & CF_LAST_IO)) {
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/* Accept I/O on the last instruction. */
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/* Accept I/O on the last instruction. */
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gen_io_start();
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set_can_do_io(db, true);
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}
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}
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ops->translate_insn(db, cpu);
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ops->translate_insn(db, cpu);
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@ -72,6 +72,7 @@ typedef enum DisasJumpType {
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* @num_insns: Number of translated instructions (including current).
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* @num_insns: Number of translated instructions (including current).
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* @max_insns: Maximum number of instructions to be translated in this TB.
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* @max_insns: Maximum number of instructions to be translated in this TB.
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* @singlestep_enabled: "Hardware" single stepping enabled.
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* @singlestep_enabled: "Hardware" single stepping enabled.
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* @saved_can_do_io: Known value of cpu->neg.can_do_io, or -1 for unknown.
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*
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*
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* Architecture-agnostic disassembly context.
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* Architecture-agnostic disassembly context.
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*/
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*/
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@ -83,6 +84,7 @@ typedef struct DisasContextBase {
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int num_insns;
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int num_insns;
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int max_insns;
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int max_insns;
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bool singlestep_enabled;
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bool singlestep_enabled;
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int8_t saved_can_do_io;
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void *host_addr[2];
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void *host_addr[2];
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} DisasContextBase;
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} DisasContextBase;
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