The 16-bit Thumb instruction subset of ARM instructions is intended for compact pro- gram encoding. Estimate the number of Thumb instructions needed to program the evaluation of the arithmetic expression shown in Figure 11.9. Assume that the Thumb subset has an appropriate divide instruction (which it does not) for the purposes of this question. How does the estimated Thumb instruction count compare to the HP3000 program instruction count in Figure 11.9a?

LO1