Although the hppa_is_pa20() helper is costly due to string comparisms in
object_dynamic_cast(), it is called quite often during memory lookups
and at each start of a block of instruction translations.
Speed hppa_is_pa20() up by calling object_dynamic_cast() only once at
CPU creation and store the result in the is_pa20 of struct CPUArchState.
Signed-off-by: Helge Deller <del...@gmx.de>
diff --git a/hw/hppa/machine.c b/hw/hppa/machine.c
index a31dc32a9f..08ac1ec068 100644
--- a/hw/hppa/machine.c
+++ b/hw/hppa/machine.c
@@ -281,6 +281,7 @@ static TranslateFn
*machine_HP_common_init_cpus(MachineState *machine)
/* Create CPUs. */
for (unsigned int i = 0; i < smp_cpus; i++) {
cpu[i] = HPPA_CPU(cpu_create(machine->cpu_type));
+ cpu[i]->env.is_pa20 = object_dynamic_cast(OBJECT(cpu[i]),
TYPE_HPPA64_CPU);
}
/*
diff --git a/target/hppa/cpu.h b/target/hppa/cpu.h
index e45ba50a59..c37a701f44 100644
--- a/target/hppa/cpu.h
+++ b/target/hppa/cpu.h
@@ -208,6 +208,7 @@ typedef struct CPUArchState {
uint64_t fr[32];
uint64_t sr[8]; /* stored shifted into place for gva */
+ bool is_pa20;
uint32_t psw; /* All psw bits except the following: */
uint32_t psw_xb; /* X and B, in their normal positions */
target_ulong psw_n; /* boolean */
@@ -294,7 +295,7 @@ struct HPPACPUClass {
static inline bool hppa_is_pa20(CPUHPPAState *env)
{
- return object_dynamic_cast(OBJECT(env_cpu(env)), TYPE_HPPA64_CPU) != NULL;
+ return env->is_pa20;
}
static inline int HPPA_BTLB_ENTRIES(CPUHPPAState *env)
