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=E2=80=94 Built-in Function: void __builtin_prefetch (const void *addr, ...)
This function is used to minimize cache-miss latency by moving data into a =
cache before it is accessed.
You can insert calls to __builtin_prefetch into code for which you know add=
resses of data in memory that
is likely to be accessed soon. If the target supports them, data prefetch i=
nstructions will be generated.
If the prefetch is done early enough before the access then the data will b=
e in the cache by the time it is accessed.

http://gcc.gnu.org/onlinedocs/gcc-3.3.6/gcc/Other-Builtins.html