Fix the bug, there seem to be an infinit loop, possiblely in L3 fib: addi sp,sp,-32 sw ra,28(sp) sw s0,24(sp) sw s1,20(sp) addi s0,sp,32 sw a0,-20(s0) lw a4,-20(s0) li a5,1 bgt a4,a5,.L2 lw a5,-20(s0) j .L3.L2: lw a5,-20(s0) addi a5,a5,-1 mv a0,a5 call fib mv s1,a0 lw a5,-20(s0) addi a5,a5,-2 mv a0,a5 call fib mv a5,a0 add a5,s1,a5.L3: mv a0,a5 lw ra,28(sp) lw s0,24(sp) lw s1,20(sp) addi sp,sp,32 jr ramain: addi sp,sp,-32 sw ra,28(sp) sw s0,24(sp) addi s0,sp,32 li a5,4 sw a5,-20(s0) lw a0,-20(s0) call fib mv a5,a0 sw a5,-24(s0) li a5,0 mv a0,a5 lw ra,28(sp) lw s0,24(sp) addi sp,sp,32 jr ra

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Fix the bug, there seem to be an infinit loop, possiblely in L3

fib:
addi sp,sp,-32
sw ra,28(sp)
sw s0,24(sp)
sw s1,20(sp)
addi s0,sp,32
sw a0,-20(s0)
lw a4,-20(s0)
li a5,1
bgt a4,a5,.L2
lw a5,-20(s0)
j .L3
.L2:
lw a5,-20(s0)
addi a5,a5,-1
mv a0,a5
call fib
mv s1,a0
lw a5,-20(s0)
addi a5,a5,-2
mv a0,a5
call fib
mv a5,a0
add a5,s1,a5
.L3:
mv a0,a5
lw ra,28(sp)
lw s0,24(sp)
lw s1,20(sp)
addi sp,sp,32
jr ra
main:
addi sp,sp,-32
sw ra,28(sp)
sw s0,24(sp)
addi s0,sp,32
li a5,4
sw a5,-20(s0)
lw a0,-20(s0)
call fib
mv a5,a0
sw a5,-24(s0)
li a5,0
mv a0,a5
lw ra,28(sp)
lw s0,24(sp)
addi sp,sp,32
jr ra

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