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 4.1, Problem 4.6PP
Explanation of Solution
Given assembly code:
long sum(long *start, long count)
start in %rdi, count in %rsi
sum:
irmovq $8, %r8
irmovq $1, %r9
xorq %rax, %rax
andq %rsi, %rsi
jmp test
loop:
mrmovq (%rdi),%r10
addq %r10, %rax
addq %r8, %rdi
subq %r9, %rsi
test:
jne loop
ret
Data movement instructions:
- The different instructions are been grouped as “instruction classes”.
- The instructions in a class performs same operation but with different sizes of operand.
- The “Mov” class denotes data movement instructions that copy data from a source location to a destination.
- The class has 4 instructions that includes:
- movb:
- It copies data from a source location to a destination.
- It denotes an instruction that operates on 1 byte data size.
- movw:
- It copies data from a source location to a destination.
- It denotes an instruction that operates on 2 bytes data size.
- movl:
- It copies data from a source location to a destination.
- It denotes an instruction that operates on 4 bytes data size.
- movq:
- It copies data from a source location to a destination.
- It denotes an instruction that operates on 8 bytes data size.
- movb:
Unary and Binary Operations:
- The details of unary operations includes:
- The single operand functions as both source as well as destination.
- It can either be a memory location or a register.
- The instruction “incq” causes 8 byte element on stack top to be incremented.
- The instruction “decq” causes 8 byte element on stack top to be decremented.
- The details of binary operations includes:
- The first operand denotes the source.
- The second operand works as both source as well as destination.
- The first operand can either be an immediate value, memory location or register.
- The second operand can either be a register or a memory location.
Jump Instruction:
- The “jump” instruction causes execution to switch to an entirely new position in program.
- The “label” indicates jump destinations in assembly code...
Expert Solution & Answer
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(e) Instruction(s) to copy contents at one memory location to another: C[g] =A[i+j-3). Assume i, j,g values are in registers x5, x6, x7. Assume base address in memory of Array data structures 'A, B' (or address in memory of 'A[O]' and 'B[O]') are stored in Registers x28, 29• In RISCV, only load and store instructions access memory locations • These instructions must follow a 'format' to access memory • Assume a 32 bit machine in all problems unless asked to assume otherwise
(c) The following Sigma 16 program has been loaded into memory at address 0000:
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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
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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.
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[7]
[1] (
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Assume the following values are stored at the indicated memory addresses and
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0x100
OxFF
0x104
OxAB
0x108
0x13
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%rax
%rcx
%rdx
$0x108
(%rax)
4(%rax)
9(%rax, %rdx)
260(%rcx,%rdx)
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(%rax, %rdx, 4)
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0x3
Fill in the following table showing the values for the indicated operands:
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Chapter 4 Solutions
Computer Systems: A Programmer's Perspective (3rd Edition)
Ch. 4.1 - Prob. 4.1PPCh. 4.1 - Prob. 4.2PPCh. 4.1 - Prob. 4.3PPCh. 4.1 - Prob. 4.4PPCh. 4.1 - Prob. 4.5PPCh. 4.1 - Prob. 4.6PPCh. 4.1 - Prob. 4.7PPCh. 4.1 - Prob. 4.8PPCh. 4.2 - Practice Problem 4.9 (solution page 484) Write an...Ch. 4.2 - Prob. 4.10PP
Ch. 4.2 - Prob. 4.11PPCh. 4.2 - Prob. 4.12PPCh. 4.3 - Prob. 4.13PPCh. 4.3 - Prob. 4.14PPCh. 4.3 - Prob. 4.15PPCh. 4.3 - Prob. 4.16PPCh. 4.3 - Prob. 4.17PPCh. 4.3 - Prob. 4.18PPCh. 4.3 - Prob. 4.19PPCh. 4.3 - Prob. 4.20PPCh. 4.3 - Prob. 4.21PPCh. 4.3 - Prob. 4.22PPCh. 4.3 - Prob. 4.23PPCh. 4.3 - Prob. 4.24PPCh. 4.3 - Prob. 4.25PPCh. 4.3 - Prob. 4.26PPCh. 4.3 - Prob. 4.27PPCh. 4.4 - Prob. 4.28PPCh. 4.4 - Prob. 4.29PPCh. 4.5 - Prob. 4.30PPCh. 4.5 - Prob. 4.31PPCh. 4.5 - Prob. 4.32PPCh. 4.5 - Prob. 4.33PPCh. 4.5 - Prob. 4.34PPCh. 4.5 - Prob. 4.35PPCh. 4.5 - Prob. 4.36PPCh. 4.5 - Prob. 4.37PPCh. 4.5 - Prob. 4.38PPCh. 4.5 - Prob. 4.39PPCh. 4.5 - Prob. 4.40PPCh. 4.5 - Prob. 4.41PPCh. 4.5 - Prob. 4.42PPCh. 4.5 - Prob. 4.43PPCh. 4.5 - Prob. 4.44PPCh. 4 - Prob. 4.45HWCh. 4 - Prob. 4.46HWCh. 4 - Prob. 4.47HWCh. 4 - Prob. 4.48HWCh. 4 - Modify the code you wrote for Problem 4.47 to...Ch. 4 - In Section 3.6.8, we saw that a common way to...Ch. 4 - Prob. 4.51HWCh. 4 - The file seq-full.hcl contains the HCL description...Ch. 4 - Prob. 4.53HWCh. 4 - The file pie=full. hcl contains a copy of the PIPE...Ch. 4 - Prob. 4.55HWCh. 4 - Prob. 4.56HWCh. 4 - Prob. 4.57HWCh. 4 - Our pipelined design is a bit unrealistic in that...Ch. 4 - Prob. 4.59HW
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