package ocaml_intrinsics

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The are two version of count_leading_zeros, count_set_bits each, which differ in their native code implementation. The first version takes as input a tagged integer and the second version takes as input an untagged integer. Generally, the first version (that operates on a tagged integer) is faster, but if the integer is already untagged, it may be faster to use the second version.

val count_leading_zeros : int -> int

count_leading_zeros n returns the number of most-significant zero bits before the most significant set bit in n. If n is 0, the result is the number of bits in n, that is 31 or 63, depending on the target.

val count_leading_zeros2 : int -> int

val count_set_bits : int -> int

count_set_bits n returns the number of bits that are 1 in n.

val count_set_bits2 : int -> int

val count_trailing_zeros : int -> int

count_trailing_zeros n returns the number of least-significant zero bits before the least significant set bit in n. If n is 0, the result is the number of bits in n, that is 31 or 63, depending on the target.