//GVN try to assign a value numbers to expressions.
bool IR_GVN::perform(OPT_CTX & oc)
{
IR_BB_LIST * bbl = m_ru->get_bb_list();
if (bbl->get_elem_count() == 0) { return false; }
START_TIMER_AFTER();
m_ru->check_valid_and_recompute(&oc, OPT_DU_CHAIN, OPT_DU_REF, OPT_RPO,
OPT_DOM, OPT_UNDEF);
LIST<IR_BB*> * tbbl = m_cfg->get_bblist_in_rpo();
IS_TRUE0(tbbl->get_elem_count() == bbl->get_elem_count());
UINT count = 0;
bool change = true;
#ifdef DEBUG_GVN
while (change && count < 10) {
change = false;
#endif
for (IR_BB * bb = tbbl->get_head();
bb != NULL; bb = tbbl->get_next()) {
process_bb(bb, change);
} //end for BB
count++;
#ifdef DEBUG_GVN
} //end while
IS_TRUE0(!change && count <= 2);
#endif
//dump();
END_TIMER_AFTER(get_opt_name());
IS_TRUE0(verify());
m_is_valid = true;
return true;
}
int configure_accelerator(MachineState *ms)
{
const char *p;
char buf[10];
int ret;
bool accel_initialised = false;
bool init_failed = false;
AccelClass *acc = NULL;
p = qemu_opt_get(qemu_get_machine_opts(), "accel");
if (p == NULL) {
/* Use the default "accelerator", tcg */
p = "tcg";
}
while (!accel_initialised && *p != '\0') {
if (*p == ':') {
p++;
}
p = get_opt_name(buf, sizeof(buf), p, ':');
acc = accel_find(buf);
if (!acc) {
fprintf(stderr, "\"%s\" accelerator not found.\n", buf);
continue;
}
if (acc->available && !acc->available()) {
printf("%s not supported for this target\n",
acc->name);
continue;
}
ret = accel_init_machine(acc, ms);
if (ret < 0) {
init_failed = true;
fprintf(stderr, "failed to initialize %s: %s\n",
acc->name,
strerror(-ret));
} else {
accel_initialised = true;
}
}
if (!accel_initialised) {
if (!init_failed) {
fprintf(stderr, "No accelerator found!\n");
}
exit(1);
}
if (init_failed) {
fprintf(stderr, "Back to %s accelerator.\n", acc->name);
}
return !accel_initialised;
}
void configure_accelerator(MachineState *ms)
{
const char *accel, *p;
char buf[10];
int ret;
bool accel_initialised = false;
bool init_failed = false;
AccelClass *acc = NULL;
accel = qemu_opt_get(qemu_get_machine_opts(), "accel");
if (accel == NULL) {
/* Use the default "accelerator", tcg */
accel = "tcg";
}
p = accel;
while (!accel_initialised && *p != '\0') {
if (*p == ':') {
p++;
}
p = get_opt_name(buf, sizeof(buf), p, ':');
acc = accel_find(buf);
if (!acc) {
continue;
}
if (acc->available && !acc->available()) {
printf("%s not supported for this target\n",
acc->name);
continue;
}
ret = accel_init_machine(acc, ms);
if (ret < 0) {
init_failed = true;
error_report("failed to initialize %s: %s",
acc->name, strerror(-ret));
} else {
accel_initialised = true;
}
}
if (!accel_initialised) {
if (!init_failed) {
error_report("-machine accel=%s: No accelerator found", accel);
}
exit(1);
}
if (init_failed) {
error_report("Back to %s accelerator", acc->name);
}
}