### 6.55 Cilk Plus C/C++ language extension Built-in Functions.

GCC provides support for the following built-in reduction funtions if Cilk Plus is enabled. Cilk Plus can be enabled using the `-fcilkplus` flag.

- __sec_implicit_index
- __sec_reduce
- __sec_reduce_add
- __sec_reduce_all_nonzero
- __sec_reduce_all_zero
- __sec_reduce_any_nonzero
- __sec_reduce_any_zero
- __sec_reduce_max
- __sec_reduce_min
- __sec_reduce_max_ind
- __sec_reduce_min_ind
- __sec_reduce_mul
- __sec_reduce_mutating

Further details and examples about these built-in functions are described in the Cilk Plus language manual which can be found at http://www.cilkplus.org.