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Eliminates non-portable use of fls.

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Thomas Harte
2019-11-09 16:03:00 -05:00
parent c4fefe1eb3
commit 5fc4e57db7
2 changed files with 16 additions and 3 deletions
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Components/68901/MFP68901.cpp
+4 -3
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@@ -301,7 +301,7 @@ void MFP68901::update_interrupts() {
if(interrupt_vector_ & 0x8) {
// Software interrupt mode: permit only if neither this interrupt
// nor a higher interrupt is currently in service.
const int highest_bit = 1 << (fls(firing_interrupts) - 1);
const int highest_bit = msb16(firing_interrupts);
interrupt_line_ = !(interrupt_in_service_ & ~(highest_bit - 1));
} else {
// Auto-interrupt mode; just signal.
@@ -326,8 +326,7 @@ int MFP68901::acknowledge_interrupt() {
return NoAcknowledgement;
}
const int selected = fls(interrupt_pending_ & interrupt_mask_) - 1;
const int mask = 1 << selected;
const int mask = msb16(interrupt_pending_ & interrupt_mask_);
// Clear the pending bit regardless.
interrupt_pending_ &= ~mask;
@@ -339,6 +338,8 @@ int MFP68901::acknowledge_interrupt() {
update_interrupts();
int selected = 0;
while((1 << selected) != mask) ++selected;
LOG("Interrupt acknowledged: " << selected);
return (interrupt_vector_ & 0xf0) | uint8_t(selected);
}