conditional nested loops

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i have 6 nested loops. i know that's crazy. even more crazy is that i don't need the first 3 of them if a certain condition is met. it would be nice if i could put those 3 after an if that tests the condition. but the syntax does not support that. it is ambiguous how many statements forming the loops the condition applies to. i don't even see how to do this in C. i could do this in assembly language (it's trivial to jump over code that runs a loop) but i want this code to be portable. any ideas?