How to eliminate redundant constant move instructions

Hi,
I found following intermediate codes are generated in gcc


rx <- 0
...
use rx
...
ry <- 0
use ry
...


It's normally a result of const propagation.
After register allocation, It is likely rx/ry get allocated into
different hard registers.
Thus in final codes, there would be a redundant "move 0" instruction.


The story even stands for Os compiling, so the question is:
Is there any optimization technique dedicates to this kind of case?
Or is it normally handled by other optimizations as sub task?


Thanks very much.
--
Best Regards.

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