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Where should we use register keyword?

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sagar474

sagar474

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register char special;
register short int i=0,a=0;
register short int c;

I used these 4 register variables in my code. Is this helps to speed up my program?

how many register variables that i can use? register key word all owes reserve a register for the program?
 

Re: Where should we use rigester keyword?

I used these 4 register variables in my code. Is this helps to speed up my program?
Click to expand...

Register keyword is used used to store a variable in CPU registers. Yes it speeds up the execution of your program


how many register variables that i can use? register key word all owes reserve a register for the program?
Click to expand...

Number of register values depends on the number of registers in the CPU and also its availability (some of the CPU registers may be occupied for some task)

In case you declare more register variable than the total available registers then the rest of them will be considered as "auto" storage class
 

Re: Where should we use rigester keyword?

using 4 register variables in a program is detestable?

is gcc compiler is smart enough to optimize the code even i ignored the use of register keyword?
 

Re: Where should we use rigester keyword?

Keep the most frequently accessed variable in register
 

Re: Where should we use rigester keyword?

The register keyword is just a suggestion to the compiler to use a register for the variable it can't force it to happen.
The compiler may well ignore it as easily as it can use a register for any automatic variable if it thinks that it will benefit the speed.
I don't think there is a point to add the keyword , if it is needed it will be done anyway.

What is register variable in c language

Alex
 

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