Computer Systems: A Programmer's Perspective (3rd Edition)
3rd Edition
ISBN: 9780134092669
Author: Bryant, Randal E. Bryant, David R. O'Hallaron, David R., Randal E.; O'Hallaron, Bryant/O'hallaron
Publisher: PEARSON
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Expert Solution & Answer
Chapter 3.6, Problem 3.20PP
a.
Explanation of Solution
Operation OP:
- The operation “OP” denotes “/” operator.
- The division operation can be performed using right shifting...
b.
Explanation of Solution
Modified annotated code:
long arith(long x)
x in %rdi
arith:
leaq 7(%rdi), %rax ; temp = x+7
testq %rdi, %rdi ;Test x
cmovns %rdi, %rax ; If x>=0, temp = x
sarq $3, %rax ; result = temp>>3
ret
Explanation:
Expert Solution & Answer
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Check out a sample textbook solution
Students have asked these similar questions
4(c): Design an "unconventional" priority encoder as follows: It has 3 inputs D0, D1 and D2 and
outputs A1, A0 and Valid. The input combination [D1,D0] = [11] is guaranteed to never happen,
that is, both D1 and DO cannot be 1 at the same time. If D2 is 1, then the output code [A1A0]=[10].
Else it is either [01] or [00] depending on which of D1 or DO is logic 1. If any input is 1, Valid=1,
else Valid=0.
Give expressions for A1, A0 and Valid in terms of D0, D1 and D2.
A1 =
AO =
Valid =
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Chapter 3: Practice Problems
VIII. You are given the following C code to compute integer absolute value:
int abs(int x)
{
}
return x > (sizeof(int)*8-1);
int comp = x mask;
return comp;
}
A. What bit pattern does mask have, as a function of x?
B. What numerical value does mask have, as a function of x?
C. For what values of x do functions abs and opt abs return identical
results?
D. For the cases where they produce different results, how are the two
results related?
E. Show that with the addition of just one single arithmetic operation
(any C operation is allowed) that you can fix opt abs. Show your
modifications on the original code. (You can just provide the line that
you will add).
F. Are there any values of x such that abs returns a value that is not
greater than 0? Which value(s)?
(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.
Chapter 3 Solutions
Computer Systems: A Programmer's Perspective (3rd Edition)
Ch. 3.4 - Prob. 3.1PPCh. 3.4 - Prob. 3.2PPCh. 3.4 - Prob. 3.3PPCh. 3.4 - Prob. 3.4PPCh. 3.4 - Prob. 3.5PPCh. 3.5 - Prob. 3.6PPCh. 3.5 - Prob. 3.7PPCh. 3.5 - Prob. 3.8PPCh. 3.5 - Prob. 3.9PPCh. 3.5 - Prob. 3.10PP
Ch. 3.5 - Prob. 3.11PPCh. 3.5 - Prob. 3.12PPCh. 3.6 - Prob. 3.13PPCh. 3.6 - Prob. 3.14PPCh. 3.6 - Prob. 3.15PPCh. 3.6 - Prob. 3.16PPCh. 3.6 - Practice Problem 3.17 (solution page 331) An...Ch. 3.6 - Practice Problem 3.18 (solution page 332) Starting...Ch. 3.6 - Prob. 3.19PPCh. 3.6 - Prob. 3.20PPCh. 3.6 - Prob. 3.21PPCh. 3.6 - Prob. 3.22PPCh. 3.6 - Prob. 3.23PPCh. 3.6 - Practice Problem 3.24 (solution page 335) For C...Ch. 3.6 - Prob. 3.25PPCh. 3.6 - Prob. 3.26PPCh. 3.6 - Practice Problem 3.27 (solution page 336) Write...Ch. 3.6 - Prob. 3.28PPCh. 3.6 - Prob. 3.29PPCh. 3.6 - Practice Problem 3.30 (solution page 338) In the C...Ch. 3.6 - Prob. 3.31PPCh. 3.7 - Prob. 3.32PPCh. 3.7 - Prob. 3.33PPCh. 3.7 - Prob. 3.34PPCh. 3.7 - Prob. 3.35PPCh. 3.8 - Prob. 3.36PPCh. 3.8 - Prob. 3.37PPCh. 3.8 - Prob. 3.38PPCh. 3.8 - Prob. 3.39PPCh. 3.8 - Prob. 3.40PPCh. 3.9 - Prob. 3.41PPCh. 3.9 - Prob. 3.42PPCh. 3.9 - Practice Problem 3.43 (solution page 344) Suppose...Ch. 3.9 - Prob. 3.44PPCh. 3.9 - Prob. 3.45PPCh. 3.10 - Prob. 3.46PPCh. 3.10 - Prob. 3.47PPCh. 3.10 - Prob. 3.48PPCh. 3.10 - Prob. 3.49PPCh. 3.11 - Practice Problem 3.50 (solution page 347) For the...Ch. 3.11 - Prob. 3.51PPCh. 3.11 - Prob. 3.52PPCh. 3.11 - Practice Problem 3.52 (solution page 348) For the...Ch. 3.11 - Practice Problem 3.54 (solution page 349) Function...Ch. 3.11 - Prob. 3.55PPCh. 3.11 - Prob. 3.56PPCh. 3.11 - Practice Problem 3.57 (solution page 350) Function...Ch. 3 - For a function with prototype long decoda2(long x,...Ch. 3 - The following code computes the 128-bit product of...Ch. 3 - Prob. 3.60HWCh. 3 - In Section 3.6.6, we examined the following code...Ch. 3 - The code that follows shows an example of...Ch. 3 - This problem will give you a chance to reverb...Ch. 3 - Consider the following source code, where R, S,...Ch. 3 - The following code transposes the elements of an M...Ch. 3 - Prob. 3.66HWCh. 3 - For this exercise, we will examine the code...Ch. 3 - Prob. 3.68HWCh. 3 - Prob. 3.69HWCh. 3 - Consider the following union declaration: This...Ch. 3 - Prob. 3.71HWCh. 3 - Prob. 3.72HWCh. 3 - Prob. 3.73HWCh. 3 - Prob. 3.74HWCh. 3 - Prob. 3.75HW
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