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Thanks mate! :)
The dependency on front is because is reading the value from lcontsum that is been computed on the inner loop right?
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No, it is because "front += lcontsum;" is equivalent to "front = front + lcontsum;" and the "front" on the right-hand side is the value from the previous iteration, but the floating-point addition cannot be performed in one clock and hence, the new value of front needs multiple clocks to be calculated. This creates a read-after-write dependency on "front" and increases the initiation interval of the loop on "z" to a value that is equal to the latency of floating-point addition on the FPGA.
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