It's kind of starting to run

Core/MIPS/IR/IRPassSimplify.cpp

@@ -0,0 +1,14 @@
+#include "Core/MIPS/IR/IRPassSimplify.h"
+
+void SimplifyInPlace(IRInst *inst, int count, const u32 *constPool) {
+	for (int i = 0; i < count; i++) {
+		switch (inst[i].op) {
+		case IROp::AddConst:
+			if (constPool[inst[i].src2] == 0)
+				inst[i].op = IROp::Mov;
+			break;
+		default:
+			break;
+		}
+	}
+}