Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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In the recursive factorial code given below, what happens if the instruction at line
number 0x00400040 (addi $sp,$sp,8) is deleted by mistake from the following
code?
Ox00400028 fact: addi
0x0040002C
0x00400030
0x00400034
0x00400038
0x0040003C
0x00400040
0x00400044
0x00400048 L1:
0x0040004C
0x00400050
0x00400054
0x00400058
0x0040005C
0x00400060
SW
SW
siti
beq
addi
ANSWER.
addi
jr
addi
jal
Iw
Iw
$sp,$sp, -8
$ra, 4($sp)
$a0, 0($sp)
$t0, $a0, 1
$t0, $zero, L1
$v0, $zero, 1
$sp,$sp, 8
$ra
$a0, $a0, -1
fact
$a0, 0($sp)
$ra, 4($sp)
addi
$sp,$sp,8
mult $v0, $a0,$v0
jr
$ra
Possible answers are as follows:
a) Program enters an infinite loop and remains in the loop with the correct value stored in
the vo register
b) Program enters an infinite loop and remains in the loop with incorrect return value in the
vo register
c) Program enters an infinite loop and crashes due to memory access that exceeds the
stack space
d) Program will terminate properly but produce an incorrect return value in vo register, with
vo set to 0
e) Program will terminate properly but produce an incorrect return value in vo register,
with vo set to a0
f) Program will function properly
Indicate your selection (a) through (f) and justify your answer. No justification no credit.
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Transcribed Image Text:In the recursive factorial code given below, what happens if the instruction at line number 0x00400040 (addi $sp,$sp,8) is deleted by mistake from the following code? Ox00400028 fact: addi 0x0040002C 0x00400030 0x00400034 0x00400038 0x0040003C 0x00400040 0x00400044 0x00400048 L1: 0x0040004C 0x00400050 0x00400054 0x00400058 0x0040005C 0x00400060 SW SW siti beq addi ANSWER. addi jr addi jal Iw Iw $sp,$sp, -8 $ra, 4($sp) $a0, 0($sp) $t0, $a0, 1 $t0, $zero, L1 $v0, $zero, 1 $sp,$sp, 8 $ra $a0, $a0, -1 fact $a0, 0($sp) $ra, 4($sp) addi $sp,$sp,8 mult $v0, $a0,$v0 jr $ra Possible answers are as follows: a) Program enters an infinite loop and remains in the loop with the correct value stored in the vo register b) Program enters an infinite loop and remains in the loop with incorrect return value in the vo register c) Program enters an infinite loop and crashes due to memory access that exceeds the stack space d) Program will terminate properly but produce an incorrect return value in vo register, with vo set to 0 e) Program will terminate properly but produce an incorrect return value in vo register, with vo set to a0 f) Program will function properly Indicate your selection (a) through (f) and justify your answer. No justification no credit.
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