int optimize_tokens (token *tokens, int t) {
int i, z, k;
token tokens_tmp[500];
/*Drop all lines before last '* 0'*/
for (i = 0, z = -1; i < t; ++i) {
if (tokens[i].operation == t_mul && tokens[i].type == literal && tokens[i].data.value == 0) {
z = i;
break;
}
}
/*Drop '+ 0', '- 0', '* 1', '/ 1' tokens*/
for (i = z + 1, k = 0; i < t; ++i) { //and start after the last '* 0'
if (!(tokens[i].type == literal &&
(
(tokens[i].data.value == 0 && (tokens[i].operation == t_plus || tokens[i].operation == t_min)) ||
(tokens[i].data.value == 1 && (tokens[i].operation == t_mul || tokens[i].operation == t_div))
)
)) {
tokens_tmp[k++] = tokens[i];
}
}
t = k; // update tokens counter
/*update tokens array*/
for (i = 0; i < t; ++i) {
tokens[i] = tokens_tmp[i];
}
/*Convert divs and muls with powers of two to shifts*/
for (i = 0; i < t; ++i) {
if (tokens[i].type == literal && tokens[i].operation == t_mul && is_power_of_2(tokens[i].data.value)) {
tokens[i].operation = t_shl;
tokens[i].data.value = shift_times(tokens[i].data.value);
}
else if (tokens[i].type == literal && tokens[i].operation == t_div && is_power_of_2(tokens[i].data.value)) {
tokens[i].operation = t_shr;
tokens[i].data.value = shift_times(tokens[i].data.value);
}
}
return t;
}
void ShiftTimesDialog::buttonClicked(QAbstractButton* button)
{
int amount;
if (ui.buttonBox->buttonRole(button) == QDialogButtonBox::AcceptRole){
amount = ui.timeEdit->time().hour() * 3600 + ui.timeEdit->time().minute() * 60;
if (ui.backwards->isChecked())
amount *= -1;
if (amount != 0) {
// DANGER, DANGER - this could get our dive_table unsorted...
shift_times(amount);
sort_table(&dive_table);
mark_divelist_changed(TRUE);
mainWindow()->dive_list()->rememberSelection();
mainWindow()->refreshDisplay();
mainWindow()->dive_list()->restoreSelection();
}
}
}
