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CPU/Recompiler: Don't try fastmem for RAM mirrors

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This commit is contained in:
Connor McLaughlin 2020-10-26 22:07:52 +10:00
parent 875b0b91f1
commit 7f795d25aa
2 changed files with 20 additions and 11 deletions
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5
src/core/bus.cpp
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@ -335,7 +335,10 @@ void UpdateFastmemViews(bool enabled, bool isolate_cache)
bool CanUseFastmemForAddress(VirtualMemoryAddress address)
{
const PhysicalMemoryAddress paddr = address & CPU::PHYSICAL_MEMORY_ADDRESS_MASK;
return IsRAMAddress(paddr);
// Currently since we don't map the mirrors, don't use fastmem for them.
// This is because the swapping of page code bits for SMC is too expensive.
return (paddr < RAM_SIZE);
}
bool IsRAMCodePage(u32 index)

8
src/core/cpu_recompiler_code_generator_generic.cpp
View file

@ -42,9 +42,15 @@ Value CodeGenerator::EmitLoadGuestMemory(const CodeBlockInstruction& cbi, const
Value result = m_register_cache.AllocateScratch(size);
if (g_settings.IsUsingFastmem() && Bus::IsRAMAddress(static_cast<u32>(address.constant_value)))
EmitLoadGuestRAMFastmem(address, size, result);
{
// have to mask away the high bits for mirrors, since we don't map them in fastmem
EmitLoadGuestRAMFastmem(Value::FromConstantU32(static_cast<u32>(address.constant_value) & Bus::RAM_MASK), size,
result);
}
else
{
EmitLoadGlobal(result.GetHostRegister(), size, ptr);
}
m_delayed_cycles_add += read_ticks;
return result;