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Jit64: Add a switch for easier fallback to the C++ dispatcher.

This commit is contained in:
degasus 2017-01-17 22:03:51 +01:00
parent 9b77a39767
commit 43cdbab515
1 changed files with 53 additions and 47 deletions
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40
Source/Core/Core/PowerPC/Jit64/JitAsm.cpp
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@ -92,19 +92,10 @@ void Jit64AsmRoutineManager::Generate()
dispatcherNoCheck = GetCodePtr();
// Switch to the correct memory base, in case MSR.DR has changed.
// TODO: Is there a more efficient place to put this? We don't
// need to do this for indirect jumps, just exceptions etc.
TEST(32, PPCSTATE(msr), Imm32(1 << (31 - 27)));
FixupBranch physmem = J_CC(CC_NZ);
MOV(64, R(RMEM), ImmPtr(Memory::physical_base));
FixupBranch membaseend = J();
SetJumpTarget(physmem);
MOV(64, R(RMEM), ImmPtr(Memory::logical_base));
SetJumpTarget(membaseend);
// The following is a translation of JitBaseBlockCache::Dispatch into assembly.
const bool assembly_dispatcher = true;
if (assembly_dispatcher)
{
// Fast block number lookup.
// ((PC >> 2) & mask) * sizeof(JitBlock*) = (PC & (mask << 2)) * 2
MOV(32, R(RSCRATCH), PPCSTATE(pc));
@ -132,14 +123,22 @@ void Jit64AsmRoutineManager::Generate()
OR(64, R(RSCRATCH2), R(RSCRATCH_EXTRA));
CMP(64, R(RSCRATCH2), MDisp(RSCRATCH, static_cast<s32>(offsetof(JitBlock, effectiveAddress))));
FixupBranch state_mismatch = J_CC(CC_NE);
// Success; branch to the block we found.
// Switch to the correct memory base, in case MSR.DR has changed.
TEST(32, PPCSTATE(msr), Imm32(1 << (31 - 27)));
FixupBranch physmem = J_CC(CC_Z);
MOV(64, R(RMEM), ImmPtr(Memory::logical_base));
JMPptr(MDisp(RSCRATCH, static_cast<s32>(offsetof(JitBlock, normalEntry))));
SetJumpTarget(physmem);
MOV(64, R(RMEM), ImmPtr(Memory::physical_base));
JMPptr(MDisp(RSCRATCH, static_cast<s32>(offsetof(JitBlock, normalEntry))));
SetJumpTarget(not_found);
SetJumpTarget(state_mismatch);
// Failure; call into the block cache to update the state, then try again.
// (We need to loop because Jit() might not actually generate a block
// if we hit an ISI.)
// Failure, fallback to the C++ dispatcher for calling the JIT.
}
// We reset the stack because Jit might clear the code cache.
// Also if we are in the middle of disabling BLR optimization on windows
@ -151,8 +150,15 @@ void Jit64AsmRoutineManager::Generate()
ABI_PushRegistersAndAdjustStack({}, 0);
ABI_CallFunction(JitBase::Dispatch);
ABI_PopRegistersAndAdjustStack({}, 0);
// JMPptr(R(ABI_RETURN));
JMP(dispatcherNoCheck, true);
// Switch to the correct memory base, in case MSR.DR has changed.
TEST(32, PPCSTATE(msr), Imm32(1 << (31 - 27)));
FixupBranch physmem = J_CC(CC_Z);
MOV(64, R(RMEM), ImmPtr(Memory::logical_base));
JMPptr(R(ABI_RETURN));
SetJumpTarget(physmem);
MOV(64, R(RMEM), ImmPtr(Memory::physical_base));
JMPptr(R(ABI_RETURN));
SetJumpTarget(bail);
doTiming = GetCodePtr();