Index: /trunk/src/VBox/Disassembler/DisasmCore.cpp
===================================================================
--- /trunk/src/VBox/Disassembler/DisasmCore.cpp	(revision 59407)
+++ /trunk/src/VBox/Disassembler/DisasmCore.cpp	(revision 59408)
@@ -2532,5 +2532,6 @@
     uint8_t implOpcode = (byte1 & 0x1f);
 
-    // REX.RXB -- XXX check this!
+    // REX.RXB
+    /** @todo Check this! was weird: ~(byte1 & 0xe0) */
     if (pDis->uCpuMode == DISCPUMODE_64BIT && !(byte1 & 0xe0))
         pDis->fRexPrefix |= (byte1 >> 5) ^ 7;