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JitArm64/Jit64: Extend the fast lookup mmap-ed segment further to avoid needing to check the msr bits. 

And in order to avoid a double dereference in the dispatcher, directly store
the normalEntry in the map.

The index to the block map becomes ((((DR<<1) | IR) << 30) | (address >> 2)).
This has been chosen since the msr bits change less often than the address,
thus we keep nearby entries together.

Also do not call the C dispatcher in case the assembly dispatcher didn't
find a block, since it wouldn't find a block either due to the 1:1 mapping,
except when falling back to the non shm segment lookup table.
This commit is contained in:
Frajo Haider 2023-07-18 17:15:17 +03:00 committed by Franz-Josef Haider
parent 1a821465f4
commit fd9c970621
4 changed files with 149 additions and 93 deletions
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47
Source/Core/Core/PowerPC/Jit64/JitAsm.cpp
View File

@ -113,15 +113,22 @@ void Jit64AsmRoutineManager::Generate()
const bool assembly_dispatcher = true;
if (assembly_dispatcher)
{
if (m_jit.GetBlockCache()->GetFastBlockMap())
if (m_jit.GetBlockCache()->GetEntryPoints())
{
u64 icache = reinterpret_cast<u64>(m_jit.GetBlockCache()->GetFastBlockMap());
MOV(32, R(RSCRATCH), PPCSTATE(pc));
MOV(32, R(RSCRATCH2), PPCSTATE(msr));
AND(32, R(RSCRATCH2), Imm32(JitBaseBlockCache::JIT_CACHE_MSR_MASK));
SHL(64, R(RSCRATCH2), Imm8(28));
MOV(32, R(RSCRATCH_EXTRA), PPCSTATE(pc));
OR(64, R(RSCRATCH_EXTRA), R(RSCRATCH2));
u64 icache = reinterpret_cast<u64>(m_jit.GetBlockCache()->GetEntryPoints());
MOV(64, R(RSCRATCH2), Imm64(icache));
// Each 4-byte offset of the PC register corresponds to a 8-byte offset
// in the lookup table due to host pointers being 8-bytes long.
MOV(64, R(RSCRATCH), MComplex(RSCRATCH2, RSCRATCH, SCALE_2, 0));
// The entry points map is indexed by ((msrBits << 26) | (address >> 2)).
// The map contains 8 byte 64-bit pointers and that means we need to shift
// msr left by 29 bits and address left by 1 bit to get the correct offset
// in the map.
MOV(64, R(RSCRATCH), MComplex(RSCRATCH2, RSCRATCH_EXTRA, SCALE_2, 0));
}
else
{
@ -146,36 +153,43 @@ void Jit64AsmRoutineManager::Generate()
// Check if we found a block.
TEST(64, R(RSCRATCH), R(RSCRATCH));
FixupBranch not_found = J_CC(CC_Z);
FixupBranch state_mismatch;
if (!m_jit.GetBlockCache()->GetEntryPoints())
{
// Check block.msrBits.
MOV(32, R(RSCRATCH2), PPCSTATE(msr));
AND(32, R(RSCRATCH2), Imm32(JitBaseBlockCache::JIT_CACHE_MSR_MASK));
if (m_jit.GetBlockCache()->GetFastBlockMap())
{
CMP(32, R(RSCRATCH2), MDisp(RSCRATCH, static_cast<s32>(offsetof(JitBlockData, msrBits))));
}
else
{
// Also check the block.effectiveAddress
SHL(64, R(RSCRATCH2), Imm8(32));
// RSCRATCH_EXTRA still has the PC.
OR(64, R(RSCRATCH2), R(RSCRATCH_EXTRA));
CMP(64, R(RSCRATCH2),
MDisp(RSCRATCH, static_cast<s32>(offsetof(JitBlockData, effectiveAddress))));
}
FixupBranch state_mismatch = J_CC(CC_NE);
state_mismatch = J_CC(CC_NE);
// Success; branch to the block we found.
JMPptr(MDisp(RSCRATCH, static_cast<s32>(offsetof(JitBlockData, normalEntry))));
}
else
{
// Success; branch to the block we found.
JMPptr(R(RSCRATCH));
}
SetJumpTarget(not_found);
if (!m_jit.GetBlockCache()->GetEntryPoints())
{
SetJumpTarget(state_mismatch);
}
// Failure, fallback to the C++ dispatcher for calling the JIT.
}
// There is no point in calling the dispatcher in the fast lookup table
// case, since the assembly dispatcher would already have found a block.
if (!assembly_dispatcher || !m_jit.GetBlockCache()->GetEntryPoints())
{
// Ok, no block, let's call the slow dispatcher
ABI_PushRegistersAndAdjustStack({}, 0);
MOV(64, R(ABI_PARAM1), Imm64(reinterpret_cast<u64>(&m_jit)));
@ -189,6 +203,7 @@ void Jit64AsmRoutineManager::Generate()
JMPptr(R(ABI_RETURN));
SetJumpTarget(no_block_available);
}
// We reset the stack because Jit might clear the code cache.
// Also if we are in the middle of disabling BLR optimization on windows

40
Source/Core/Core/PowerPC/JitArm64/JitAsm.cpp
View File

@ -97,32 +97,21 @@ void JitArm64::GenerateAsm()
if (assembly_dispatcher)
{
if (GetBlockCache()->GetFastBlockMap())
if (GetBlockCache()->GetEntryPoints())
{
// Check if there is a block
ARM64Reg pc_masked = ARM64Reg::X25;
ARM64Reg cache_base = ARM64Reg::X24;
ARM64Reg pc_and_msr = ARM64Reg::X25;
ARM64Reg cache_base = ARM64Reg::X27;
ARM64Reg block = ARM64Reg::X30;
LSL(pc_masked, DISPATCHER_PC, 1);
MOVP2R(cache_base, GetBlockCache()->GetFastBlockMap());
LDR(block, cache_base, pc_masked);
LDR(IndexType::Unsigned, EncodeRegTo32(pc_and_msr), PPC_REG, PPCSTATE_OFF(msr));
MOVP2R(cache_base, GetBlockCache()->GetEntryPoints());
// The entry points map is indexed by ((msrBits << 26) | (address >> 2)).
UBFIZ(pc_and_msr, pc_and_msr, 26, 6);
BFXIL(pc_and_msr, EncodeRegTo64(DISPATCHER_PC), 2, 30);
LDR(block, cache_base, ArithOption(pc_and_msr, true));
FixupBranch not_found = CBZ(block);
// b.msrBits != msr
ARM64Reg msr = ARM64Reg::W27;
ARM64Reg msr2 = ARM64Reg::W24;
LDR(IndexType::Unsigned, msr, PPC_REG, PPCSTATE_OFF(msr));
AND(msr, msr, LogicalImm(JitBaseBlockCache::JIT_CACHE_MSR_MASK, 32));
LDR(IndexType::Unsigned, msr2, block, offsetof(JitBlockData, msrBits));
CMP(msr, msr2);
FixupBranch msr_missmatch = B(CC_NEQ);
// return blocks[block_num].normalEntry;
LDR(IndexType::Unsigned, block, block, offsetof(JitBlockData, normalEntry));
BR(block);
SetJumpTarget(not_found);
SetJumpTarget(msr_missmatch);
}
else
{
@ -160,8 +149,13 @@ void JitArm64::GenerateAsm()
}
}
// Call C version of Dispatch().
STR(IndexType::Unsigned, DISPATCHER_PC, PPC_REG, PPCSTATE_OFF(pc));
// There is no point in calling the dispatcher in the fast lookup table
// case, since the assembly dispatcher would already have found a block.
if (!assembly_dispatcher || !GetBlockCache()->GetEntryPoints())
{
// Call C version of Dispatch().
MOVP2R(ARM64Reg::X8, reinterpret_cast<void*>(&JitBase::Dispatch));
MOVP2R(ARM64Reg::X0, this);
BLR(ARM64Reg::X8);
@ -170,8 +164,10 @@ void JitArm64::GenerateAsm()
BR(ARM64Reg::X0);
// Call JIT
SetJumpTarget(no_block_available);
}
// Call JIT
ResetStack();
MOVP2R(ARM64Reg::X0, this);
MOV(ARM64Reg::W1, DISPATCHER_PC);

93
Source/Core/Core/PowerPC/JitCommon/JitCache.cpp
View File

@ -43,14 +43,10 @@ void JitBaseBlockCache::Init()
Common::JitRegister::Init(Config::Get(Config::MAIN_PERF_MAP_DIR));
#ifdef _ARCH_64
m_fast_block_map = reinterpret_cast<JitBlock**>(m_block_map_arena.Create(FAST_BLOCK_MAP_SIZE));
m_entry_points_ptr = reinterpret_cast<u8**>(m_entry_points_arena.Create(FAST_BLOCK_MAP_SIZE));
#else
m_fast_block_map = nullptr;
m_entry_points_ptr = nullptr;
#endif
if (m_fast_block_map)
m_fast_block_map_ptr = m_fast_block_map;
else
m_fast_block_map_ptr = m_fast_block_map_fallback.data();
Clear();
}
@ -59,7 +55,7 @@ void JitBaseBlockCache::Shutdown()
{
Common::JitRegister::Shutdown();
m_block_map_arena.Release();
m_entry_points_arena.Release();
}
// This clears the JIT cache. It's called from JitCache.cpp when the JIT cache
@ -82,8 +78,8 @@ void JitBaseBlockCache::Clear()
valid_block.ClearAll();
if (m_fast_block_map)
m_block_map_arena.Clear();
if (m_entry_points_ptr)
m_entry_points_arena.Clear();
}
void JitBaseBlockCache::Reset()
@ -92,9 +88,9 @@ void JitBaseBlockCache::Reset()
Init();
}
JitBlock** JitBaseBlockCache::GetFastBlockMap()
u8** JitBaseBlockCache::GetEntryPoints()
{
return m_fast_block_map;
return m_entry_points_ptr;
}
JitBlock** JitBaseBlockCache::GetFastBlockMapFallback()
@ -123,8 +119,11 @@ JitBlock* JitBaseBlockCache::AllocateBlock(u32 em_address)
void JitBaseBlockCache::FinalizeBlock(JitBlock& block, bool block_link,
const std::set<u32>& physical_addresses)
{
size_t index = FastLookupIndexForAddress(block.effectiveAddress);
m_fast_block_map_ptr[index] = &block;
size_t index = FastLookupIndexForAddress(block.effectiveAddress, block.msrBits);
if (m_entry_points_ptr)
m_entry_points_ptr[index] = block.normalEntry;
else
m_fast_block_map_fallback[index] = &block;
block.fast_block_map_index = index;
block.physical_addresses = physical_addresses;
@ -187,7 +186,28 @@ JitBlock* JitBaseBlockCache::GetBlockFromStartAddress(u32 addr, u32 msr)
const u8* JitBaseBlockCache::Dispatch()
{
const auto& ppc_state = m_jit.m_ppc_state;
JitBlock* block = m_fast_block_map_ptr[FastLookupIndexForAddress(ppc_state.pc)];
if (m_entry_points_ptr)
{
u8* entry_point =
m_entry_points_ptr[FastLookupIndexForAddress(ppc_state.pc, ppc_state.msr.Hex)];
if (entry_point)
{
return entry_point;
}
else
{
JitBlock* block =
MoveBlockIntoFastCache(ppc_state.pc, ppc_state.msr.Hex & JIT_CACHE_MSR_MASK);
if (!block)
return nullptr;
return block->normalEntry;
}
}
JitBlock* block =
m_fast_block_map_fallback[FastLookupIndexForAddress(ppc_state.pc, ppc_state.msr.Hex)];
if (!block || block->effectiveAddress != ppc_state.pc ||
block->msrBits != (ppc_state.msr.Hex & JIT_CACHE_MSR_MASK))
@ -408,8 +428,20 @@ void JitBaseBlockCache::UnlinkBlock(const JitBlock& block)
void JitBaseBlockCache::DestroyBlock(JitBlock& block)
{
if (m_fast_block_map_ptr[block.fast_block_map_index] == &block)
m_fast_block_map_ptr[block.fast_block_map_index] = nullptr;
if (m_entry_points_ptr)
{
if (m_entry_points_ptr[block.fast_block_map_index] == block.normalEntry)
{
m_entry_points_ptr[block.fast_block_map_index] = nullptr;
}
}
else
{
if (m_fast_block_map_fallback[block.fast_block_map_index] == &block)
{
m_fast_block_map_fallback[block.fast_block_map_index] = nullptr;
}
}
UnlinkBlock(block);
@ -436,22 +468,37 @@ JitBlock* JitBaseBlockCache::MoveBlockIntoFastCache(u32 addr, u32 msr)
return nullptr;
// Drop old fast block map entry
if (m_fast_block_map_ptr[block->fast_block_map_index] == block)
m_fast_block_map_ptr[block->fast_block_map_index] = nullptr;
if (m_entry_points_ptr)
{
if (m_entry_points_ptr[block->fast_block_map_index] == block->normalEntry)
{
m_entry_points_ptr[block->fast_block_map_index] = nullptr;
}
}
else
{
if (m_fast_block_map_fallback[block->fast_block_map_index] == block)
{
m_fast_block_map_fallback[block->fast_block_map_index] = nullptr;
}
}
// And create a new one
size_t index = FastLookupIndexForAddress(addr);
m_fast_block_map_ptr[index] = block;
size_t index = FastLookupIndexForAddress(addr, msr);
if (m_entry_points_ptr)
m_entry_points_ptr[index] = block->normalEntry;
else
m_fast_block_map_fallback[index] = block;
block->fast_block_map_index = index;
return block;
}
size_t JitBaseBlockCache::FastLookupIndexForAddress(u32 address)
size_t JitBaseBlockCache::FastLookupIndexForAddress(u32 address, u32 msr)
{
if (m_fast_block_map)
if (m_entry_points_ptr)
{
return address >> 2;
return ((msr & JIT_CACHE_MSR_MASK) << 26) | (address >> 2);
}
else
{

22
Source/Core/Core/PowerPC/JitCommon/JitCache.h
View File

@ -133,8 +133,8 @@ public:
static constexpr u32 JIT_CACHE_MSR_MASK = 0x30;
// The value for the map is determined like this:
// ((4 GB guest memory space) / (4 bytes per address)) * sizeof(JitBlock*)
static constexpr u64 FAST_BLOCK_MAP_SIZE = 0x2'0000'0000;
// ((4 GB guest memory space) / (4 bytes per address) * sizeof(JitBlock*)) * (4 for 2 bits of msr)
static constexpr u64 FAST_BLOCK_MAP_SIZE = 0x8'0000'0000;
static constexpr u32 FAST_BLOCK_MAP_FALLBACK_ELEMENTS = 0x10000;
static constexpr u32 FAST_BLOCK_MAP_FALLBACK_MASK = FAST_BLOCK_MAP_FALLBACK_ELEMENTS - 1;
@ -147,7 +147,7 @@ public:
void Reset();
// Code Cache
JitBlock** GetFastBlockMap();
u8** GetEntryPoints();
JitBlock** GetFastBlockMapFallback();
void RunOnBlocks(std::function<void(const JitBlock&)> f);
@ -188,7 +188,7 @@ private:
JitBlock* MoveBlockIntoFastCache(u32 em_address, u32 msr);
// Fast but risky block lookup based on fast_block_map.
size_t FastLookupIndexForAddress(u32 address);
size_t FastLookupIndexForAddress(u32 address, u32 msr);
// links_to hold all exit points of all valid blocks in a reverse way.
// It is used to query all blocks which links to an address.
@ -208,16 +208,14 @@ private:
// It is used to provide a fast way to query if no icache invalidation is needed.
ValidBlockBitSet valid_block;
// This array is indexed with the shifted PC and likely holds the correct block id.
// This is used as a fast cache of block_map used in the assembly dispatcher.
// It is implemented via a shm segment using m_block_map_arena.
JitBlock** m_fast_block_map = 0;
Common::LazyMemoryRegion m_block_map_arena;
// This contains the entry points for each block.
// It is used by the assembly dispatcher to quickly
// know where to jump based on pc and msr bits.
Common::LazyMemoryRegion m_entry_points_arena;
u8** m_entry_points_ptr = 0;
// An alternative for the above fast_block_map but without a shm segment
// An alternative for the above but without a shm segment
// in case the shm memory region couldn't be allocated.
std::array<JitBlock*, FAST_BLOCK_MAP_FALLBACK_ELEMENTS>
m_fast_block_map_fallback{}; // start_addr & mask -> number
JitBlock** m_fast_block_map_ptr = 0;
};