Question: Thumb code has a number of different instruction codes for programme branches; three of these are given in Figure Q4 below. In what situations are

Thumb code has a number of different instruction codes for programme

Thumb code has a number of different instruction codes for programme branches; three of these are given in Figure Q4 below. In what situations are each of these branch instructions used? What are the ranges of the branch destination for type (1) and type (2) branches? 7 15 12 11 8 1101 cond 1 8-bit offset (1) B 15 11 10 11100 11-bit offset (2) B 15 12 11 10 1111 11-bit offset (3) BL Figure Q4 By what mechanism does the Thumb 'branch and link' instruction, type (3) above, achieve a range of branch destinations up to +4 MBytes relative to the programme counter

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