How to limit bit shifting?

Question

C++ / C#

volatile u8 m_d[]={0,0,0,0b00100,0,0,0};
case 4: while(i<7){
if (m_d[i] > 0)
{
m_d[i] = (m_d[i]<<1);
}
i++;
}
I need to persuvate 1 to the least significant bit when it goes out of bounds

Answer 1

Do you need a cyclic shift?
You will have to implement it yourself - just check the last bit before the shift, if it is 1, then add 1 to the number after the shift.

if(m_d[i] & 0x80) {
  m_d[i] = (m_d[i]<<1);
  ++m_d[i];
} else {
  m_d[i] = (m_d[i]<<1);
}