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Shreesh Adiga
58a2dc3c2e
Add NEON implementation using LD3 to load 48 bytes with de-interleaving using which 6 bits are extracted using USHR and SLI to get 4 registers, which is used as a index into lookup table using TBL with 4 registers to translate into the 64-byte output, which is written using ST4 to interleave. Add a checkasm test to validate the input lengths from 0 to 239 bytes to cover all the code paths introduced in the NEON implementation. Refactored the C implementation into a header file so that it can be used from checkasm test without having to duplicate the code there. Observed about 4x speedup by checkasm on A720 core on 1kB input: C: - base64.base64 [OK] NEON: - base64.base64 [OK] checkasm: all 1 tests passed Benchmark results: name nsecs (vs ref) av_base64_encode_c: 1286.9 av_base64_encode_neon: 315.5 ( 4.08x)