vpx/vpx_dsp
Johann df69c751a7 Don't expand to Q register for 4x4 intrapred
The code was expanding to Q registers so that vqrshn could be used, for
vector quad round shift and narrow. If 4 values are added together,
there is a shift by 2. If 8 values, a shift by 3. Since this accounts
for any possibility of overflow, we can skip the narrowing shift.

This allows keeping the values in D registers and casting the 16 bit
value to 8 bits.

Change-Id: I8d9cfa07176271f492c116ffa6a7b351af0b8751
2016-08-04 18:51:46 +00:00
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