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m6502: like z80, around 10% performance gain by checking unset devcb on every opcode

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This commit is contained in:
hap 2025-03-29 19:25:41 +01:00
parent df2098bdcc
commit bff1ab51d9
1 changed files with 6 additions and 3 deletions
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9
src/devices/cpu/m6502/m6502.cpp
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@ -480,14 +480,16 @@ void m6502_device::state_string_export(const device_state_entry &entry, std::str
void m6502_device::prefetch_start()
{
sync = true;
sync_w(ASSERT_LINE);
if(!sync_w.isunset())
sync_w(ASSERT_LINE);
NPC = PC;
}
void m6502_device::prefetch_end()
{
sync = false;
sync_w(CLEAR_LINE);
if(!sync_w.isunset())
sync_w(CLEAR_LINE);
if((nmi_pending || ((irq_state || apu_irq_state) && !(P & F_I))) && !inhibit_interrupts) {
irq_taken = true;
@ -499,7 +501,8 @@ void m6502_device::prefetch_end()
void m6502_device::prefetch_end_noirq()
{
sync = false;
sync_w(CLEAR_LINE);
if(!sync_w.isunset())
sync_w(CLEAR_LINE);
PC++;
}