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ieee488: a few optimizations to "state-changed" callbacks

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This commit is contained in:
fulivi 2016-11-22 09:52:24 +01:00
parent a7ee0a41e9
commit 85aa483c37
1 changed files with 15 additions and 12 deletions
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27
src/devices/bus/ieee488/ieee488.cpp
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@ -188,6 +188,7 @@ ieee488_device::daisy_entry::daisy_entry(device_t *device)
void ieee488_device::set_signal(device_t *device, int signal, int state)
{
bool changed = false;
int old_state = get_signal(signal);
if (device == this)
{
@ -218,8 +219,13 @@ void ieee488_device::set_signal(device_t *device, int signal, int state)
}
}
if (changed)
{
if (!changed) {
return;
}
state = get_signal(signal);
if (old_state != state) {
switch (signal)
{
case EOI: m_write_eoi(state); break;
@ -289,21 +295,18 @@ int ieee488_device::get_signal(int signal)
{
int state = m_line[signal];
if (state)
{
daisy_entry *entry = m_device_list.first();
daisy_entry *entry = m_device_list.first();
while (entry)
while (state && entry)
{
if (!entry->m_line[signal])
{
state = 0;
break;
}
{
state = 0;
break;
}
entry = entry->next();
}
}
return state;
}
@ -352,7 +355,7 @@ uint8_t ieee488_device::get_data()
daisy_entry *entry = m_device_list.first();
while (entry)
while (data && entry)
{
data &= entry->m_dio;