I want to prefetch certain addresses (which are address of certain elements of a huge array) in my C program and see the effect of that on time taken.
The instruction about PREFETCH i found here PREFETCH0. But I am not aware of how to use it in C using inline assembly. It would be of great help if some body can give some idea how should I use this instruction with the address as argument, in C program.
Don't write it using inline assembly which would make the compiler's job harder. GCC has a built-in extension for prefetch you should use instead:
This will generate code using the prefetch instructions of your target, but with more scope for the compiler to be smart about it.
See gcc docs for more details: https://gcc.gnu.org/onlinedocs/gcc-4.8.0/gcc/Other-Builtins.html