vllm.utils.math_utils ¶

def cdiv(a: int, b: int) -> int:
    """Ceiling division."""
    return -(a // -b)

def largest_power_of_2_divisor(n: int) -> int:
    """Return the largest power-of-2 that divides *n* (isolate lowest set bit)."""
    return n & (-n)

def next_power_of_2(n: int) -> int:
    """The next power of 2 (inclusive)"""
    return 1 if n < 1 else 1 << (n - 1).bit_length()

def prev_power_of_2(n: int) -> int:
    """The previous power of 2 (inclusive)"""
    return 0 if n <= 0 else 1 << (n.bit_length() - 1)

def round_down(x: int, y: int) -> int:
    """Round down x to the nearest multiple of y."""
    return (x // y) * y

def round_up(x: int, y: int) -> int:
    """Round up x to the nearest multiple of y."""
    return ((x + y - 1) // y) * y