Change #254122

Comments

avutil/crc: add x86 SSE4.2 clmul SIMD implementation for av_crc
Implemented the algorithm described in the paper titled
"Fast CRC Computation for Generic Polynomials Using PCLMULQDQ Instruction"
by Intel.
It is not used yet; the integration will be added in a separate commit.

Observed near 10x speedup on AMD Zen4 7950x:
av_crc_c:                                            22057.0 ( 1.00x)
av_crc_clmul:                                         2202.8 (10.01x)

Changed files

• libavutil/x86/crc.asm
• libavutil/x86/crc.h