Faq in C :

[madhu_v]

Hi, When will a register variable would be created in "C"?(during compile or run time)

[Selvam R]

register is only hint to compiler! The compiler may ignore this. So, it will created during compile time.

Thanks and Regards, Selvam, http://www.wincpp.com

[Adam Roderick J]

Yes compilation time itself. Actually register storage class specifier indicates to the compiler that the object should be stored in a machine register. Which makes it extremely faster than in physical memory. But with some restrictions For more info just refer the below link :- http://publib.boulder.ibm.com/infocenter/lnxpcomp/v8v101/index.jsp?topic=/com.ibm.xlcpp8l.doc/language/ref/regdef.htm[^]

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[madhu_v]

Thanks in advance.. How do the compiler know the availability of free registers at compile time? It's practically soundless, when a stack frame is created at runtime how could the register variable is defined at compile time?

[CPallini]

madhu_v wrote:

How do the compiler know the availability of free registers at compile time?

Well, I believe that allocating registers is one of the task of a compiler... :rolleyes: Anyway, the register keyword is just an hint for the compiler. :)

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[Rane]

During Compile time... Regards, Rane

[madhu_v]

Thank you for all the reply....

[Adam Roderick J]

Yes exactly :)

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