Many compilers let you supply pragmas that give hints as to how many iterations a loop will usually be hit, whether this will multiples of x etc. Compiler can t

Many compilers let you supply pragmas that give hints as to how many iterations a loop will usually be hit, whether this will multiples of x etc. Compiler can then use this info to decide whether to apply various optimisations. I think it's not part of C because it's kinda an underlying detail - explicitly informing the compiler how it should optimise something shouldn't really be part of the language really, pragmas are good for this