Farhan,

It is likely that you are seeing an example of compiler optimisation. Is it perhaps the case that the call to your assembly language function is the last thing that the calling function does?

The important thing is, if you follow the rules for writing a C callable function in assembly language, it will work. It is up to the C compiler to make sure it follows its own rules - you should not try to make it produce what you expect or want to see.