Add CLZ instruction

[charliewager]

Utilize the CLZ instruction to eliminate the if-block.

Details:

• Use CLZ assembly instructions to get number of leading 0s
• Subtract 8 and take the abs value to get the value of the 3 chord bits
• mask original mag with 0b1111 << (abs(result of CLZ - 8) + 1) to get step bits

Example:

4bbit int chord = abs(CLZ val - 8) 4bit int step = mag << (abs(CLZ - 7))

8bit int result = sign << 7 | chord << 4 | step