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Optimize CRC intrinisics for targets lacking of CRC extension #627

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merged 1 commit into from
Jan 30, 2024
Merged

Optimize CRC intrinisics for targets lacking of CRC extension #627

merged 1 commit into from
Jan 30, 2024

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Cuda-Chen
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@Cuda-Chen Cuda-Chen commented Jan 16, 2024 •
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Close #624.

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jserv commented Jan 17, 2024

The current _sse2neon_crc32_tbl uses 256 * 4 bytes, totaling 1 KiB. Is there a way to reduce its memory usage?

@DLTcollab DLTcollab deleted a comment from Cuda-Chen Jan 17, 2024
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jserv commented Jan 17, 2024 •
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Reference implementation in Linux kernel.

  • Accelerated CRC32(C) using ARM CRC, NEON and Crypto Extensions instructions
  • Accelerated CRC-T10DIF using ARM NEON and Crypto Extensions instructions (CRC16 CRC algorithm used for the T10 (SCSI) Data Integrity Field (DIF))

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jserv commented Jan 22, 2024

Reference paper titled Fast CRC Computation for Generic Polynomials Using PCLMULQDQ Instruction.

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Hi @jserv ,
before converting this PR to a normal PR, I would like to ask whether it is necessary to implement runtime dispatching in this PR?

@Cuda-Chen Cuda-Chen force-pushed the optimize-CRC-for-targets-lacking-of-CRC branch from cbaaa4b to 66267b5 Compare January 30, 2024 13:16
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jserv commented Jan 30, 2024

before converting this PR to a normal PR, I would like to ask whether it is necessary to implement runtime dispatching in this PR?

Compile-time options for diverse Arm extensions would be great.

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before converting this PR to a normal PR, I would like to ask whether it is necessary to implement runtime dispatching in this PR?

Compile-time options for diverse Arm extensions would be great.

For my experience, I will use -mcpu to determine the instruction set and the features (e.g., crypto and crc).

Anyway, I think I will make this PR ready for merge.

@Cuda-Chen Cuda-Chen marked this pull request as ready for review January 30, 2024 13:48
@Cuda-Chen Cuda-Chen requested a review from jserv January 30, 2024 13:48
@jserv jserv merged commit 4a036e6 into DLTcollab:master Jan 30, 2024
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@marktwtn marktwtn Awaiting requested review from marktwtn marktwtn is a code owner

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Optimize CRC intrinisics for targets lacking of CRC extension
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