[Pixman] MIPS DSPr2: Fix for in_n_8 routine.

Nemanja Lukic nemanja.lukic at rt-rk.com
Mon Mar 4 06:36:41 PST 2013

Increasing number of the iterations in blitters-test revealed bug in DSPr2
optimization. Bug is in the in_n_8 routine. Rounding logic was not implemented
right. Also, code used unnecessary multiplications, which could be avoided
by packing 4 destination (a8) pixel into one 32bit register. There were also,
unnecessary spills on stack. Code is rewritten to address mentioned issues.

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