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Make them at least as fast as the compiled C version (tested on cortex-a53 vs. gcc 4.9.2). C NEON (before) NEON (after) intra_predict_4x4_dc: 260 335 260 intra_predict_4x4_dct: 210 265 200 intra_predict_8x8c_dc: 497 548 493 intra_predict_8x8c_v: 232 309 179 (arm64) intra_predict_8x16c_dc: 795 830 790
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