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32e273c111
Keep the idct32 coefficients in narrow form in q6-q7, and idct16 coefficients in lengthened 32 bit form in q0-q3. Avoid clobbering q0-q3 in the pass1 function, and squeeze the idct16 coefficients into q0-q1 in the pass2 function to avoid reloading them. The idct16 coefficients are clobbered and reloaded within idct32_odd though, since that turns out to be faster than narrowing them and swapping them into q6-q7. Before: Cortex A7 A8 A9 A53 vp9_inv_dct_dct_32x32_sub4_add_10_neon: 22653.8 18268.4 19598.0 14079.0 vp9_inv_dct_dct_32x32_sub32_add_10_neon: 37699.0 38665.2 32542.3 24472.2 After: vp9_inv_dct_dct_32x32_sub4_add_10_neon: 22270.8 18159.3 19531.0 13865.0 vp9_inv_dct_dct_32x32_sub32_add_10_neon: 37523.3 37731.6 32181.7 24071.2 Signed-off-by: Martin Storsjö <martin@martin.st>