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static inline void enc_loop_neon64_inner (const uint8_t **s, uint8_t **o, const uint8x16x4_t tbl_enc) { // Load 48 bytes and deinterleave: uint8x16x3_t src = vld3q_u8(*s); // Divide bits of three input bytes over four output bytes: uint8x16x4_t out = enc_reshuffle(src); // The bits have now been shifted to the right locations; // translate their values 0..63 to the Base64 alphabet. // Use a 64-byte table lookup: out.val[0] = vqtbl4q_u8(tbl_enc, out.val[0]); out.val[1] = vqtbl4q_u8(tbl_enc, out.val[1]); out.val[2] = vqtbl4q_u8(tbl_enc, out.val[2]); out.val[3] = vqtbl4q_u8(tbl_enc, out.val[3]); // Interleave and store output: vst4q_u8(*o, out); *s += 48; *o += 64; } static inline void enc_loop_neon64 (const uint8_t **s, size_t *slen, uint8_t **o, size_t *olen) { size_t rounds = *slen / 48; *slen -= rounds * 48; // 48 bytes consumed per round *olen += rounds * 64; // 64 bytes produced per round // Load the encoding table: const uint8x16x4_t tbl_enc = load_64byte_table(base64_table_enc_6bit); while (rounds > 0) { if (rounds >= 8) { enc_loop_neon64_inner(s, o, tbl_enc); enc_loop_neon64_inner(s, o, tbl_enc); enc_loop_neon64_inner(s, o, tbl_enc); enc_loop_neon64_inner(s, o, tbl_enc); enc_loop_neon64_inner(s, o, tbl_enc); enc_loop_neon64_inner(s, o, tbl_enc); enc_loop_neon64_inner(s, o, tbl_enc); enc_loop_neon64_inner(s, o, tbl_enc); rounds -= 8; continue; } if (rounds >= 4) { enc_loop_neon64_inner(s, o, tbl_enc); enc_loop_neon64_inner(s, o, tbl_enc); enc_loop_neon64_inner(s, o, tbl_enc); enc_loop_neon64_inner(s, o, tbl_enc); rounds -= 4; continue; } if (rounds >= 2) { enc_loop_neon64_inner(s, o, tbl_enc); enc_loop_neon64_inner(s, o, tbl_enc); rounds -= 2; continue; } enc_loop_neon64_inner(s, o, tbl_enc); break; } }