GCC provides support for the following built-in reduction functions 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.
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https://gcc.gnu.org/onlinedocs/gcc-6.3.0/gcc/Cilk-Plus-Builtins.html