GSP: Don't try to write memory fill registers if start address is 0

Verified to be what GSP does via REing. Fixes invalid virt->phys
translation error spam in some games.

src/core/hle/service/gsp_gpu.cpp

@@ -391,19 +391,24 @@ static void ExecuteCommand(const Command& command, u32 thread_id) {
     case CommandId::SET_MEMORY_FILL:
     {
         auto& params = command.memory_fill;
-        WriteGPURegister(static_cast<u32>(GPU_REG_INDEX(memory_fill_config[0].address_start)),
-                         Memory::VirtualToPhysicalAddress(params.start1) >> 3);
-        WriteGPURegister(static_cast<u32>(GPU_REG_INDEX(memory_fill_config[0].address_end)),
-                         Memory::VirtualToPhysicalAddress(params.end1) >> 3);
-        WriteGPURegister(static_cast<u32>(GPU_REG_INDEX(memory_fill_config[0].value_32bit)), params.value1);
-        WriteGPURegister(static_cast<u32>(GPU_REG_INDEX(memory_fill_config[0].control)), params.control1);
-
-        WriteGPURegister(static_cast<u32>(GPU_REG_INDEX(memory_fill_config[1].address_start)),
-                         Memory::VirtualToPhysicalAddress(params.start2) >> 3);
-        WriteGPURegister(static_cast<u32>(GPU_REG_INDEX(memory_fill_config[1].address_end)),
-                         Memory::VirtualToPhysicalAddress(params.end2) >> 3);
-        WriteGPURegister(static_cast<u32>(GPU_REG_INDEX(memory_fill_config[1].value_32bit)), params.value2);
-        WriteGPURegister(static_cast<u32>(GPU_REG_INDEX(memory_fill_config[1].control)), params.control2);
+
+        if (params.start1 != 0) {
+            WriteGPURegister(static_cast<u32>(GPU_REG_INDEX(memory_fill_config[0].address_start)),
+                    Memory::VirtualToPhysicalAddress(params.start1) >> 3);
+            WriteGPURegister(static_cast<u32>(GPU_REG_INDEX(memory_fill_config[0].address_end)),
+                    Memory::VirtualToPhysicalAddress(params.end1) >> 3);
+            WriteGPURegister(static_cast<u32>(GPU_REG_INDEX(memory_fill_config[0].value_32bit)), params.value1);
+            WriteGPURegister(static_cast<u32>(GPU_REG_INDEX(memory_fill_config[0].control)), params.control1);
+        }
+
+        if (params.start2 != 0) {
+            WriteGPURegister(static_cast<u32>(GPU_REG_INDEX(memory_fill_config[1].address_start)),
+                    Memory::VirtualToPhysicalAddress(params.start2) >> 3);
+            WriteGPURegister(static_cast<u32>(GPU_REG_INDEX(memory_fill_config[1].address_end)),
+                    Memory::VirtualToPhysicalAddress(params.end2) >> 3);
+            WriteGPURegister(static_cast<u32>(GPU_REG_INDEX(memory_fill_config[1].value_32bit)), params.value2);
+            WriteGPURegister(static_cast<u32>(GPU_REG_INDEX(memory_fill_config[1].control)), params.control2);
+        }
         break;
     }