Merge pull request #12138 from JosJuice/jit-gp-check-discard

Jit: Don't discard before gather pipe interrupt check

Source/Core/Core/PowerPC/Jit64/RegCache/JitRegCache.cpp

@@ -421,7 +421,9 @@ void RegCache::Flush(BitSet32 pregs)
     switch (m_regs[i].GetLocationType())
     {
     case PPCCachedReg::LocationType::Default:
+      break;
     case PPCCachedReg::LocationType::Discarded:
+      ASSERT_MSG(DYNA_REC, false, "Attempted to flush discarded PPC reg {}", i);
       break;
     case PPCCachedReg::LocationType::SpeculativeImmediate:
       // We can have a cached value without a host register through speculative constants.

Source/Core/Core/PowerPC/JitArm64/JitArm64_RegCache.cpp

@@ -245,11 +245,14 @@ void Arm64GPRCache::FlushRegisters(BitSet32 regs, bool maintain_state, ARM64Reg
   {
     if (regs[i])
     {
+      ASSERT_MSG(DYNA_REC, m_guest_registers[GUEST_GPR_OFFSET + i].GetType() != RegType::Discarded,
+                 "Attempted to flush discarded register");
+
       if (i + 1 < GUEST_GPR_COUNT && regs[i + 1])
       {
         // We've got two guest registers in a row to store
-        OpArg& reg1 = m_guest_registers[i];
+        OpArg& reg1 = m_guest_registers[GUEST_GPR_OFFSET + i];
-        OpArg& reg2 = m_guest_registers[i + 1];
+        OpArg& reg2 = m_guest_registers[GUEST_GPR_OFFSET + i + 1];
         if (reg1.IsDirty() && reg2.IsDirty() && reg1.GetType() == RegType::Register &&
             reg2.GetType() == RegType::Register)
         {
@@ -283,6 +286,9 @@ void Arm64GPRCache::FlushCRRegisters(BitSet32 regs, bool maintain_state, ARM64Re
   {
     if (regs[i])
     {
+      ASSERT_MSG(DYNA_REC, m_guest_registers[GUEST_CR_OFFSET + i].GetType() != RegType::Discarded,
+                 "Attempted to flush discarded register");
+
       FlushRegister(GUEST_CR_OFFSET + i, maintain_state, tmp_reg);
     }
   }

Source/Core/Core/PowerPC/PPCAnalyst.cpp

@@ -757,6 +757,16 @@ bool PPCAnalyzer::IsBusyWaitLoop(CodeBlock* block, CodeOp* code, size_t instruct
   return false;
 }
 
+static bool CanCauseGatherPipeInterruptCheck(const CodeOp& op)
+{
+  // eieio
+  if (op.inst.OPCD == 31 && op.inst.SUBOP10 == 854)
+    return true;
+
+  return op.opinfo->type == OpType::Store || op.opinfo->type == OpType::StoreFP ||
+         op.opinfo->type == OpType::StorePS;
+}
+
 u32 PPCAnalyzer::Analyze(u32 address, CodeBlock* block, CodeBuffer* buffer,
                          std::size_t block_size) const
 {
@@ -952,6 +962,14 @@ u32 PPCAnalyzer::Analyze(u32 address, CodeBlock* block, CodeBuffer* buffer,
   {
     CodeOp& op = code[i];
 
+    if (CanCauseGatherPipeInterruptCheck(op))
+    {
+      // If we're doing a gather pipe interrupt check after this instruction, we need to
+      // be able to flush all registers, so we can't have any discarded registers.
+      gprDiscardable = BitSet32{};
+      fprDiscardable = BitSet32{};
+    }
+
     const BitSet8 opWantsCR = op.wantsCR;
     const bool opWantsFPRF = op.wantsFPRF;
     const bool opWantsCA = op.wantsCA;