diff --git a/cpu/ppc/ppcopcodes.cpp b/cpu/ppc/ppcopcodes.cpp
index 725fbb4..2c40fdd 100644
--- a/cpu/ppc/ppcopcodes.cpp
+++ b/cpu/ppc/ppcopcodes.cpp
@@ -1270,18 +1270,21 @@ void dppc_interpreter::ppc_creqv() {
 }
 void dppc_interpreter::ppc_crnand() {
     ppc_grab_regsdab();
-    if (!((ppc_state.cr & (0x80000000UL >> reg_a)) && (ppc_state.cr & (0x80000000UL >> reg_b)))) {
-        ppc_state.cr |= (0x80000000UL >> reg_d);
-    } else {
+    uint8_t ir = (ppc_state.cr >> (31 - reg_a)) & (ppc_state.cr >> (31 - reg_b));
+    if (ir & 1) {
         ppc_state.cr &= ~(0x80000000UL >> reg_d);
+    } else {
+        ppc_state.cr |= (0x80000000UL >> reg_d);
     }
 }
+
 void dppc_interpreter::ppc_crnor() {
     ppc_grab_regsdab();
-    if (!((ppc_state.cr & (0x80000000UL >> reg_a)) || (ppc_state.cr & (0x80000000UL >> reg_b)))) {
-        ppc_state.cr |= (0x80000000UL >> reg_d);
-    } else {
+    uint8_t ir = (ppc_state.cr >> (31 - reg_a)) | (ppc_state.cr >> (31 - reg_b));
+    if (ir & 1) {
         ppc_state.cr &= ~(0x80000000UL >> reg_d);
+    } else {
+        ppc_state.cr |= (0x80000000UL >> reg_d);
     }
 }