Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN: 9780133594140
Author: James Kurose, Keith Ross
Publisher: PEARSON
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Transcribed Image Text:gcc generates the following assembly code:
long dw_loop(long x)
x initially in %rdi
dw_loop:
movq %rdi, %rax
movq %rdi, %rcx
imulq %rdi, %rcx
leaq (%rdi, %rdi), %rdx
.L2
leaq 1(%rcx, %rах), %raх
subq 1,ドル %rdx
testq %rdx, %rdx
jg L2
ret
1) Which registers are used to hold program values x, y, z?
2) Add annotations to the assembly code
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Transcribed Image Text:For the C code
int dw_loop(long x) {
long y = x* x;
long 'p - &x;
long n - 2*x
do {
x += y;
(*p)++;
n--;
} while (n > 0);
return x;
}
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