Function u4_2_nib_shift_blake

bitvm/src/u4/u4_shift_stack.rs:96–102

Assuming the u4 numbers X and Y are on top of the stack, calculates (16 * Y + X) >> 3 modulo 16

(stack: &mut StackTracker, tables: StackVariable)

/// Assuming the u4 numbers X and Y are on top of the stack, calculates (16 * Y + X) >> 3 modulo 16
pub fn u4_2_nib_shift_blake(stack: &mut StackTracker, tables: StackVariable) -> StackVariable {
    stack.number(8);
    stack.op_greaterthanorequal();
    stack.op_swap();
    stack.get_value_from_table(tables, None);
    stack.op_add()
}

#[cfg(test)]
mod tests {