Merge pull request #19128 from hrydgard/more-ir-interpreter-tweaks

More IR interpreter optimizations

Author: hrydgard

Core/MIPS/IR/IRInst.h

@@ -18,8 +18,6 @@
 // MIPS->target JITs.
 
 enum class IROp : uint8_t {
-	Nop,
-
 	SetConst,
 	SetConstF,
 
@@ -230,6 +228,8 @@ enum class IROp : uint8_t {
 	ValidateAddress16,
 	ValidateAddress32,
 	ValidateAddress128,
+
+	Nop,
 };
 
 enum IRComparison {
@@ -358,7 +358,7 @@ struct IRInst {
 };
 
 // Returns the new PC.
-u32 IRInterpret(MIPSState *ms, const IRInst *inst, int count);
+u32 IRInterpret(MIPSState *ms, const IRInst *inst);
 
 // Each IR block gets a constant pool.
 class IRWriter {

Core/MIPS/IR/IRInterpreter.cpp

@@ -108,13 +108,9 @@ u32 RunValidateAddress(u32 pc, u32 addr, u32 isWrite) {
 }
 
 // We cannot use NEON on ARM32 here until we make it a hard dependency. We can, however, on ARM64.
-u32 IRInterpret(MIPSState *mips, const IRInst *inst, int count) {
-	const IRInst *end = inst + count;
-	while (inst != end) {
+u32 IRInterpret(MIPSState *mips, const IRInst *inst) {
+	while (true) {
 		switch (inst->op) {
-		case IROp::Nop:
-			_assert_(false);
-			break;
 		case IROp::SetConst:
 			mips->r[inst->dest] = inst->constant;
 			break;
@@ -1121,19 +1117,21 @@ u32 IRInterpret(MIPSState *mips, const IRInst *inst, int count) {
 		case IROp::UpdateRoundingMode:
 			// TODO: Implement
 			break;
-
+		case IROp::Nop:
+			_assert_(false);
+			break;
 		default:
 			// Unimplemented IR op. Bad.
 			Crash();
 		}
-		inst++;
-	}
 
 #ifdef _DEBUG
-	if (mips->r[0] != 0)
-		Crash();
+		if (mips->r[0] != 0)
+			Crash();
 #endif
+		inst++;
+	}
 
-	// We hit count.  If this is a full block, it was badly constructed.
+	// We should not reach here anymore.
 	return 0;
 }

Core/MIPS/IR/IRInterpreter.h

@@ -23,4 +23,4 @@ inline static u32 ReverseBits32(u32 v) {
 u32 IRRunBreakpoint(u32 pc);
 u32 IRRunMemCheck(u32 pc, u32 addr);
 
-u32 IRInterpret(MIPSState *ms, const IRInst *inst, int count);
+u32 IRInterpret(MIPSState *ms, const IRInst *inst);

Core/MIPS/IR/IRJit.cpp

@@ -246,21 +246,23 @@ void IRJit::RunLoopUntil(u64 globalticks) {
 		if (coreState != 0) {
 			break;
 		}
-		while (mips_->downcount >= 0) {
-			u32 inst = Memory::ReadUnchecked_U32(mips_->pc);
+
+		MIPSState *mips = mips_;
+
+		while (mips->downcount >= 0) {
+			u32 inst = Memory::ReadUnchecked_U32(mips->pc);
 			u32 opcode = inst & 0xFF000000;
 			if (opcode == MIPS_EMUHACK_OPCODE) {
 				IRBlock *block = blocks_.GetBlockUnchecked(inst & 0xFFFFFF);
-				u32 startPC = mips_->pc;
-				mips_->pc = IRInterpret(mips_, block->GetInstructions(), block->GetNumInstructions());
+				mips->pc = IRInterpret(mips, block->GetInstructions());
 				// Note: this will "jump to zero" on a badly constructed block missing exits.
-				if (!Memory::IsValidAddress(mips_->pc) || (mips_->pc & 3) != 0) {
-					Core_ExecException(mips_->pc, startPC, ExecExceptionType::JUMP);
+				if (!Memory::IsValid4AlignedAddress(mips->pc)) {
+					Core_ExecException(mips->pc, block->GetOriginalStart(), ExecExceptionType::JUMP);
 					break;
 				}
 			} else {
 				// RestoreRoundingMode(true);
-				Compile(mips_->pc);
+				Compile(mips->pc);
 				// ApplyRoundingMode(true);
 			}
 		}

Core/MIPS/IR/IRNativeCommon.cpp

@@ -153,13 +153,14 @@ void IRNativeBackend::DoMIPSInst(uint32_t value) {
 }
 
 uint32_t IRNativeBackend::DoIRInst(uint64_t value) {
-	IRInst inst;
+	IRInst inst[2];
 	memcpy(&inst, &value, sizeof(inst));
 
 	if constexpr (enableDebugStats)
-		debugSeenNotCompiledIR[(uint8_t)inst.op]++;
+		debugSeenNotCompiledIR[(uint8_t)inst[0].op]++;
 
-	return IRInterpret(currentMIPS, &inst, 1);
+	inst[1].op = IROp::ExitToPC;
+	return IRInterpret(currentMIPS, &inst[0]);
 }
 
 int IRNativeBackend::ReportBadAddress(uint32_t addr, uint32_t alignment, uint32_t isWrite) {

Core/MemMap.h

@@ -296,6 +296,21 @@ inline bool IsValidAddress(const u32 address) {
 	}
 }
 
+inline bool IsValid4AlignedAddress(const u32 address) {
+	if ((address & 0x3E000003) == 0x08000000) {
+		return true;
+	} else if ((address & 0x3F800003) == 0x04000000) {
+		return true;
+	} else if ((address & 0xBFFFC003) == 0x00010000) {
+		return true;
+	} else if ((address & 0x3F000000) >= 0x08000000 && (address & 0x3F000000) < 0x08000000 + g_MemorySize) {
+		return (address & 3) == 0;
+	} else {
+		return false;
+	}
+}
+
+
 inline u32 MaxSizeAtAddress(const u32 address){
 	if ((address & 0x3E000000) == 0x08000000) {
 		return 0x08000000 + g_MemorySize - (address & 0x3FFFFFFF);