MAD library for TI-54X DSPs

Hi
I am trying to port the MAD library for the TI-54X DSP and running into 
tight timing issues. When analysed, I found out that the 54X DSP takes more 
instructions to perform LONG calculations at the SYNTHESIS FILTER Bank stage 
as it is a 16 bit processor [but with a 40 bit accumulator]. As it is 
required to perform 72 times the DCT32 and the remaining MATRIX calculations 
at the SYNTH stage, I like to optimize the synthesis filter bank.
I am not sure about using the Q28.4 format being used by MAD. Is there 
anyway we can use the Q15.1 format for the calculations?
I like to know is there any hints or clues for the LONG calculations that I 
can make use of during my 54X porting phase. Also any thought about using 
the NORM instruction to round the final samples to 16 bit will be helpful.

Regards
Balaji Shanmugam

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