// Code for : x->x() {x->cond()} x->y() ? x->tval() : x->fval()
void LIRGenerator::do_IfOp(IfOp* x) {
#ifdef ASSERT
{
ValueTag xtag = x->x()->type()->tag();
ValueTag ttag = x->tval()->type()->tag();
assert(xtag == intTag || xtag == objectTag, "cannot handle others");
assert(ttag == addressTag || ttag == intTag || ttag == objectTag || ttag == longTag, "cannot handle others");
assert(ttag == x->fval()->type()->tag(), "cannot handle others");
}
#endif
LIRItem left(x->x(), this);
LIRItem right(x->y(), this);
left.load_item();
right.load_item();
emit()->ifop_phase1(x->cond(), left.result(), right.result());
LIRItem t_val(x->tval(), this);
LIRItem f_val(x->fval(), this);
t_val.dont_load_item();
f_val.dont_load_item();
RInfo reg;
if (x->fval()->type()->tag() == longTag) {
// must lock before releasing
reg = rlock_result(x)->rinfo();
}
if (x->fval()->type()->tag() != longTag) {
reg = rlock_result(x)->rinfo();
}
emit()->ifop_phase2(reg, t_val.result(), f_val.result(), x->cond());
}
static bool bench_try(struct thrarg *thrarg, unsigned iters)
{
const unsigned min_samples = 10;
double sum, avg, std_dev = 1.0, u = 1.0, e = 1.0;
size_t n, i;
bool print_samples = thrarg->params.print_samples;
bool success = false;
const unsigned max_samples = thrarg->params.max_samples ?
thrarg->params.max_samples : 400;
const double error = thrarg->params.max_error ?
thrarg->params.max_error / 100.0 : 0.05;
double *samples = (double *)calloc(max_samples, sizeof(double));
if (max_samples < min_samples)
return false;
sum = 0.0;
avg = 0.0;
n = 0;
for (i = 0; i < max_samples; i++) {
bench_once(thrarg, iters);
samples[i] = thrarg->result.avg;
sum += samples[i];
n = i + 1;
if (n < min_samples)
continue;
avg = sum/n;
std_dev = stdev(n, samples, avg);
double t = t_val(n);
u = std_dev * t;
e = u/avg;
//fprintf(stderr, "a=%f e=%f u=%f t=%f sd=%f\n", avg, e, u, t, std_dev);
if (e < error) {
success = true;
break;
}
}
thrarg->result.avg = avg;
thrarg->result.samples = n;
thrarg->result.iters = iters;
thrarg->result.sum = sum;
thrarg->result.sdev = std_dev;
thrarg->result.u = u;
thrarg->result.err = e;
if (print_samples) {
for (i = 0; i < n; i++)
fprintf(stderr, "%f\n", samples[i]);
}
fprintf(stderr, "i = %d n = %zd sdev = %f u = %f e = %f a = %f\n",
iters, n, std_dev, u, e, avg);
//fprintf(stderr, "i = %d n = %zd sdev = %f u = %f e = %f a = %f me = %f s = %hhd\n",
//iters, n, std_dev, u, e, avg, error, (char)success);
return success;
}
