Question 6 Assume the following registers contents: Find the shortest sequence of ARMv7 instructions that extracts bits 16 down to 11 from register RO and uses the value of this field to replace bits 31 down to 26 in register R1 without changing the other 26 bits in register R1. While the values of RO and R1 don't matter, you might consider RO to be Ox00000000, and R1 to be OxFFFFFFFF. Easy to do this in 4 or 5 instructions. BUT flexible operand 2 allows this in 3 instructions!

Computer Networking: A Top-Down Approach (7th Edition)
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Author:James Kurose, Keith Ross
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Question 6 <Section: §2.6> Assume the following registers contents:
Find the shortest sequence of ARMv7 instructions that extracts bits 16 down to 11 from register RO and uses the value of this field to replace bits 31 down to
26 in register R1 without changing the other 26 bits in register R1. While the values of RO and R1 don't matter, you might consider RO to be Ox00000000, and
R1 to be OxFFFFFFFF. Easy to do this in 4 or 5 instructions. BUT flexible operand 2 allows this in 3 instructions!
Transcribed Image Text:Question 6 <Section: §2.6> Assume the following registers contents: Find the shortest sequence of ARMv7 instructions that extracts bits 16 down to 11 from register RO and uses the value of this field to replace bits 31 down to 26 in register R1 without changing the other 26 bits in register R1. While the values of RO and R1 don't matter, you might consider RO to be Ox00000000, and R1 to be OxFFFFFFFF. Easy to do this in 4 or 5 instructions. BUT flexible operand 2 allows this in 3 instructions!
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