diff --git a/cpu/ppc/test/ppctests.cpp b/cpu/ppc/test/ppctests.cpp
index 5d5ffba..fb8fe28 100644
--- a/cpu/ppc/test/ppctests.cpp
+++ b/cpu/ppc/test/ppctests.cpp
@@ -11,6 +11,53 @@ using namespace std;
 int ntested; /* number of tested instructions */
 int nfailed; /* number of failed instructions */
 
+void xer_ov_test(string mnem, uint32_t opcode)
+{
+    ppc_state.ppc_gpr[3] = 2;
+    ppc_state.ppc_gpr[4] = 2;
+    ppc_state.ppc_spr[SPR::XER] = 0xFFFFFFFF;
+    ppc_cur_instruction = opcode;
+    ppc_main_opcode();
+    if (ppc_state.ppc_spr[SPR::XER] & 0x40000000UL) {
+        cout << "Invalid " << mnem << " emulation! XER[OV] should not be set."
+            << endl;
+        nfailed++;
+    }
+    ntested++;
+}
+
+void xer_update_test()
+{
+    xer_ov_test("ADDCO",    0x7C632414);
+    xer_ov_test("ADDCO.",   0x7C632415);
+    xer_ov_test("ADDO",     0x7C632614);
+    xer_ov_test("ADDO.",    0x7C632615);
+    xer_ov_test("ADDEO",    0x7C632514);
+    xer_ov_test("ADDEO.",   0x7C632515);
+    xer_ov_test("ADDMEO",   0x7C6305D4);
+    xer_ov_test("ADDMEO.",  0x7C6305D5);
+    xer_ov_test("ADDZEO",   0x7C630594);
+    xer_ov_test("ADDZEO.",  0x7C630595);
+    xer_ov_test("DIVWO",    0x7C6327D6);
+    xer_ov_test("DIVWO.",   0x7C6327D7);
+    xer_ov_test("DIVWUO",   0x7C632796);
+    xer_ov_test("DIVWUO.",  0x7C632797);
+    xer_ov_test("MULLWO",   0x7C6325D6);
+    xer_ov_test("MULLWO.",  0x7C6325D7);
+    xer_ov_test("NEGO",     0x7C6304D0);
+    xer_ov_test("NEGO.",    0x7C6304D1);
+    xer_ov_test("SUBFO",    0x7C632450);
+    xer_ov_test("SUBFO.",   0x7C632451);
+    xer_ov_test("SUBFCO",   0x7C632410);
+    xer_ov_test("SUBFCO.",  0x7C632411);
+    xer_ov_test("SUBFEO",   0x7C632510);
+    xer_ov_test("SUBFEO.",  0x7C632511);
+    xer_ov_test("SUBFMEO",  0x7C6305D0);
+    xer_ov_test("SUBFMEO.", 0x7C6305D1);
+    xer_ov_test("SUBFZEO",  0x7C630590);
+    xer_ov_test("SUBFZEO.", 0x7C630591);
+}
+
 /** testing vehicle */
 void read_test_data()
 {
@@ -105,10 +152,15 @@ int main()
 
     cout << "Running DingusPPC emulator tests..." << endl << endl;
 
-    cout << "Testing integer instructions:" << endl;
-
+    ntested = 0;
     nfailed = 0;
 
+    cout << "Testing XER[OV] updating..." << endl << endl;
+
+    xer_update_test();
+
+    cout << endl << "Testing integer instructions:" << endl;
+
     read_test_data();
 
     cout << "... completed." << endl;