Adding correct vlmul shifts for all vpu modes #215
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Adds the correct right shift for vlmul in vpu_sim.c in different vpu modes for vx4a other than s16 (s8, s32).
It could be implemented directly with macros, but since it will end up as an if statement at the architecture level anyway, it feels more natural to use a switch and compute each case explicitly.
I’m happy to replace the function with macros or an alternative approach if preferred; my main goal here is to ensure correct VPU rounding and saturation for all modes so I have a vpu sim to test against.