Review the following code. State which of the functions breaks the register convention rules and what would happen if the code was run as is. How would one fix this code, this can be done by stating the parts that need to be fixed or simply rewriting the code.

 

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# foo is a function that when called, it

# 1. loops through an array

# 2. applies the function bar on each value in the array

#

# Parameters:

# a0 holds the address of the array

# a1 holds the number of elements in array a0

foo:

      addi sp, sp, -12 # adjust sp

      sw ra, 0(sp) # save ra in stack

      mv s0, a0 # s0 <- arr

      add s1, zero, zero # s1 <- counter

L1: 

     addi s1, s1, 1 # increase the counter

     lw a0, 0(a0) # load word into a0

     jal ra, bar # call bar

     sw a0, 0(s0) # store the updated value back into the array

     addi a0, a0, 4 # go to the next element in the array

     bne s1, a1, L1 # check if the end of array is reached

     lw ra, 0(sp) # restore ra back from stack

     addi sp, sp, 12 # adjust sp

     jalr zero, ra, 0

 

# bar is a function that 

# 1. squares the value of a0 and 

# 2. adds 31 to it

#

# Parameters:

# a0 holds the value to be modified

bar:

     mul a0, a0, a0 # a0 <- a0 * a0

     addi a0, a0, 31 # a0 <- a0 + 31

     jalr zero, ra, 0