Spec¶

class Spec:
    """Constants and helpers for the CLZ opcode."""

    CLZ = 0x1E
    CLZ_GAS_COST = 5

    @classmethod
    def calculate_clz(cls, value: int) -> int:
        """Calculate the count of leading zeros for a 256-bit value."""
        if value == 0:
            return 256
        return 256 - value.bit_length()