(1) A function with prototype long decode (long x, long y, long z); Has the following assembly code from gcc (Note that the line numbers in the first column have no functional value, but are supplied to help): 1. decode: subą %rdi, % rsi imulq %rsi, movq %rsi, salq $63, $63, 2. 3. %rdi 4. %rax 5. %rax %rax %rax 6. sarq 7. xorq %rdi, 8. ret (a) Annotate the assembly code. (b) Hence write C code for decode that has the equivalent effect to the assembly code.

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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(1) A function with prototype
long decode (long x, long y, long z);
Has the following assembly code from gcc (Note that the line numbers in the first
column have no functional value, but are supplied to help):
1. decode:
subą %rdi, % rsi
imulq %rsi,
movq %rsi,
salq $63,
$63,
2.
3.
%rdi
4.
%rax
5.
%rax
%rax
%rax
6.
sarq
7.
xorq %rdi,
8.
ret
(a) Annotate the assembly code.
(b) Hence write C code for decode that has the equivalent effect to the assembly
code.
Transcribed Image Text:(1) A function with prototype long decode (long x, long y, long z); Has the following assembly code from gcc (Note that the line numbers in the first column have no functional value, but are supplied to help): 1. decode: subą %rdi, % rsi imulq %rsi, movq %rsi, salq $63, $63, 2. 3. %rdi 4. %rax 5. %rax %rax %rax 6. sarq 7. xorq %rdi, 8. ret (a) Annotate the assembly code. (b) Hence write C code for decode that has the equivalent effect to the assembly code.
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