In G'MIC, there's repeat(num_of_iters,_var_name,code();); on JIT code, and repeat code_block done outside of JIT. It has while, for, dowhile on JIT too. Other than repeat, there is only do while, and for which is while outside of JIT.

Note: _var_name, can be omitted. So, if you need to just repeat a code N times, that can be removed.