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log2_int_ceil

Return the log base 2 of integer value x, rounding up to the nearest integer.

math.log2_int_ceil

pub fn log2_int_ceil(comptime T: type, x: T) Log2IntCeil(T)

File

lib/std/math.zig:1299

Code

pub fn log2_int_ceil(comptime T: type, x: T) Log2IntCeil(T) {
    if (@typeInfo(T) != .int or @typeInfo(T).int.signedness != .unsigned)
        @compileError("log2_int_ceil requires an unsigned integer, found " ++ @typeName(T));
    assert(x != 0);
    if (x == 1) return 0;
    const log2_val: Log2IntCeil(T) = log2_int(T, x - 1);
    return log2_val + 1;
}