Floating-Point Instructions (Loop Timing II) Consider the following code fragment:

loop:

l.d f0,0(r2)

l.d f2,0(r3)

s.d f0,0(r2)

sub.d f4,f4,f0

add.d f4,f4,f4

addi r2,r2,8

addi r3,r3,8

sub r4,r5,r3

bnez r4,

loop 'sub.d' and 'add.d' have 3 x-boxes. 'mul.d' has 4 x-boxes. Functional units are fully pipelined. The loop iterates 90 times. Draw the space-time diagram of this code. Calculate the total execution time of the loop.