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 3.23PP
A.
Explanation of Solution
Registers for holding values:
- The parameter “x” is been passed to function in register “%rdi”.
- Once loop is entered, there is no reference to register.
- The register “%rax” is initialized to “x”.
- The register “%rcx” is initialized to “x*x”...
B.
Explanation of Solution
Compiler elimination of pointer variable:
- The pointer “p” always points to x as determined by compiler.
- The expression “(*p)++” would increment x...
C.
Explanation of Solution
Modified annotated code:
long dw_loop(long x)
x in %rdi
dw_loop:
movq %rdi, %rax;Copy x to %rax
movq %rdi, %rcx
imulq %rdi, %rcx;Compute y = x*x
leaq (%rdi, %rdi), %rdx;Compute n = 2*x
.L2:;Loop
leaq 1(%rcx, %rax), %rax;Compute x+=y+1
subq $1, %rdx;Decrement n
testq %rdx, %rdx;Test n
jg ...
Expert Solution & Answer
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Check out a sample textbook solution
Students have asked these similar questions
1. A. Convert the following C code into AT&T assembly:
x at 8(%ebp)
if (x>5){
X++;
}
else {
X--;
}
while (x<10){
x++;
}
B. Annotate each line of the assembly code to describe how it operates.
C. Write a goto version of the function (in C) that mimics how the assembly code program
operates.
Problem I ( Assembler )
Provide the assembly implementation of the C - code below . Sub 10 is a function that subtract 10 from a given input x.
Assumption :
MyArray base address is store in register $S1.
Feel free to use instruction li or si.
li load an immediate value into a register . For instance, li $S4 5 will copy value 5 into register $S4.
C code
for ( i = 0,1 < 10 , i ++ )
{
MyArray [ i ] = MyArray [ i - 1 ] + MyArray [ i + 1 ] ;
Sub10 ( MyArray [ i ];
}
Sub10 ( x )
{
Return ( x - 10 ) ;
}
Code in Assembly Language:
sub10(int): ; Implementation of the sub10() function
push rbp
mov rbp, rsp
mov DWORD PTR [rbp-4], edi
mov eax, DWORD PTR [rbp-4]
sub eax, 10
pop rbp
ret
main: ; Main function Implementation
push rbp
mov rbp, rsp
sub rsp, 64
mov…
(c) The following Sigma 16 program has been loaded into memory at address 0000:
load R3,y[RO]
load R4,x[RO]
lea R5, 2[RO]
sub R1,R4,R3
mul R2,R1,R5
store R2,w[RO]
trap RO,RO,RO
x data 10
y data 12
w data 0
Show the content of the memory writing hexadecimal representation and using a
table with 3 columns: the memory address, the contents of that memory address,
and an explanation of what "the content (of that memory address) means". As a
reference, here are the opcodes for RRR instructions: add 0, sub 1, mul 2, trap c.
And here the opcodes for RX instructions: lea 0, load 1, store 2.
[7]
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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