Comparing two QWORDs

[NoCforMe]

Another rookie question (from a non-rookie, no less):
Is this the correct way to do an unsigned comparison between two QWORD items in regular MASM (no SSE, MMX or other fancy stuff)?

Code Select Expand


Item1 LABEL QWORD
  Item1Hi DD ?
  Item1Lo DD ?

Item2 LABEL QWORD
  Item2Hi DD ?
  Item2Lo DD ?

;***** Compare the two (unsigned):  *****

; Compare the high DWORDs first:
MOV EDX, Item1Hi
CMP EDX, Item2Hi
JA bigger
JB smaller

; They're equal, so compare the low DWORDs:
MOV EAX, Item1Lo
CMP EAX, Item2Lo
JA bigger
JB smaller

;***** They're equal here ...

bigger:

smaller:


[NoCforMe]

OK, figured it out. The answer is yes.