Rémi Denis-Courmont 4ad5b9c8db lavc/startcode: add R-V Zbb startcode_find_candidate ...

The main loop processes 8 bytes in 5 instructions.
For comparison, the optimal plain strnlen() requires 4 instructions per
byte (6.4x worse): LBU; ADDI; BEQZ; BNE. The current libavcodec C code
involves 5 instructions per byte (8x worse). Actual benchmarks may be
slightly less favourable due to latency from ORC.B to BNE.

2024-05-19 10:03:49 +03:00

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