Mojo function

log2_floor

log2_floor(val: Int) -> Int

Returns the floor of the base-2 logarithm of an integer value.

Args:

val (Int): The input value.

Returns:

Int: The floor of the base-2 logarithm of the input value, which is equal to the position of the highest set bit. Returns -1 if val is 0 or negative.

log2_floor[dtype: DType, width: Int, //](val: SIMD[dtype, width]) -> SIMD[dtype, width]

Returns the floor of the base-2 logarithm of an integer value.

Parameters:

dtype (DType): The dtype of the input SIMD vector.
width (Int): The width of the input and output SIMD vector.

Args:

val (SIMD): The input value.

Returns:

SIMD: The floor of the base-2 logarithm of the input value, which is equal to the position of the highest set bit. Returns -1 if val is 0 or negative.