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Add a descriptive comment to coefficient reordering

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Pauli Oikkonen 2018-12-03 14:41:41 +02:00
parent f78bf2ebcb
commit c465578048
1 changed files with 4 additions and 0 deletions
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src/strategies/avx2/quant-avx2.c
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@ -400,6 +400,10 @@ void kvz_quant_flat_avx2(const encoder_state_t * const state, coeff_t * __restri
scan[subpos] + width * 3, scan[subpos] + width * 3,
}; };
// NOTE: Upper means "higher in pixel order inside block", which implies
// lower addresses (note the difference: HIGH and LOW vs UPPER and LOWER),
// so upper 128b vector actually becomes the lower part of a 256-bit coeff
// vector and lower vector the higher part!
__m128d coefs_d_upper; __m128d coefs_d_upper;
__m128d coefs_d_lower; __m128d coefs_d_lower;
__m128d q_coefs_d_upper; __m128d q_coefs_d_upper;