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CPU/Recompiler: Optimize constant reads (and some writes)

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This commit is contained in:
Connor McLaughlin
2020-10-16 23:30:56 +10:00
parent 69b2c3fc2d
commit 0afdc04d88
4 changed files with 169 additions and 5 deletions
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69
src/core/bus.cpp
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@ -22,6 +22,11 @@ Log_SetChannel(Bus);
namespace Bus {
enum : TickCount
{
RAM_READ_TICKS = 4
};
union MEMDELAY
{
u32 bits;
@ -288,7 +293,7 @@ ALWAYS_INLINE static TickCount DoRAMAccess(u32 offset, u32& value)
}
}
return (type == MemoryAccessType::Read) ? 4 : 0;
return (type == MemoryAccessType::Read) ? RAM_READ_TICKS : 0;
}
template<MemoryAccessType type, MemoryAccessSize size>
@ -753,7 +758,7 @@ ALWAYS_INLINE_RELEASE void DoInstructionRead(PhysicalMemoryAddress address, void
{
std::memcpy(data, &g_ram[address & RAM_MASK], sizeof(u32) * word_count);
if constexpr (add_ticks)
g_state.pending_ticks += (icache_read ? 1 : 4) * word_count;
g_state.pending_ticks += (icache_read ? 1 : RAM_READ_TICKS) * word_count;
}
else if (address >= BIOS_BASE && address < (BIOS_BASE + BIOS_SIZE))
{
@ -776,7 +781,7 @@ TickCount GetInstructionReadTicks(VirtualMemoryAddress address)
if (address < RAM_MIRROR_END)
{
return 4;
return RAM_READ_TICKS;
}
else if (address >= BIOS_BASE && address < (BIOS_BASE + BIOS_SIZE))
{
@ -1307,6 +1312,64 @@ bool SafeWriteMemoryWord(VirtualMemoryAddress addr, u32 value)
return DoMemoryAccess<MemoryAccessType::Write, MemoryAccessSize::Word>(addr, value) >= 0;
}
void* GetDirectReadMemoryPointer(VirtualMemoryAddress address, MemoryAccessSize size, TickCount* read_ticks)
{
using namespace Bus;
const u32 seg = (address >> 29);
if (seg != 0 && seg != 4 && seg != 5)
return nullptr;
const PhysicalMemoryAddress paddr = address & PHYSICAL_MEMORY_ADDRESS_MASK;
if (paddr < RAM_MIRROR_END)
{
if (read_ticks)
*read_ticks = RAM_READ_TICKS;
return &g_ram[paddr & RAM_MASK];
}
if ((paddr & DCACHE_LOCATION_MASK) == DCACHE_LOCATION)
{
if (read_ticks)
*read_ticks = 0;
return &g_state.dcache[paddr & DCACHE_OFFSET_MASK];
}
if (paddr >= BIOS_BASE && paddr < (BIOS_BASE + BIOS_SIZE))
{
if (read_ticks)
*read_ticks = m_bios_access_time[static_cast<u32>(size)];
return &g_bios[paddr & BIOS_MASK];
}
return nullptr;
}
void* GetDirectWriteMemoryPointer(VirtualMemoryAddress address, MemoryAccessSize size)
{
using namespace Bus;
const u32 seg = (address >> 29);
if (seg != 0 && seg != 4 && seg != 5)
return nullptr;
const PhysicalMemoryAddress paddr = address & PHYSICAL_MEMORY_ADDRESS_MASK;
#if 0
// Not enabled until we can protect code regions.
if (paddr < RAM_MIRROR_END)
return &g_ram[paddr & RAM_MASK];
#endif
if ((paddr & DCACHE_LOCATION_MASK) == DCACHE_LOCATION)
return &g_state.dcache[paddr & DCACHE_OFFSET_MASK];
return nullptr;
}
namespace Recompiler::Thunks {
u64 ReadMemoryByte(u32 address)