As noted here: http://sourceware.org/gdb/onlinedocs/gdb/GDB_002fMI-Data-Manipulation.html the list of registers can contain empty names so that the name index corresponds to the number from the list of values. However, in Qt Creator (gdbengine.cpp:3721) empty entries are discarded completely, which throws off alignment with the values (since the number from the values info is used as the index into the list of names). This manifests for me where ax,bx,cx,dx contain (2, 0, 60, 1) but eax,ebx,ecx,edx,esi contain (0, 2, 0, 60, 1) (everything is shifted down).

One can see this by debugging the attached main.cpp. If I set a breakpoint at line 11 (z = x + y), the disassembly says the value should be put into the eax register. However, the register pane shows eax unchanged and the proper value is in ebx. However, ax shows the new value. I've attached my debugger log, which shows register-values with a missing number #101 and index #101 in register-names as empty.