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Re: Improve CRC32C performance on SSE4.2 - Mailing list pgsql-hackers

From Nathan Bossart
Subject Re: Improve CRC32C performance on SSE4.2
Date
Msg-id aFCXO7MztuZezdpH@nathan
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In response to RE: Improve CRC32C performance on SSE4.2  ("Devulapalli, Raghuveer" <raghuveer.devulapalli@intel.com>)
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On Mon, Jun 16, 2025 at 06:31:11PM +0000, Devulapalli, Raghuveer wrote:
> Attached is a simple reproducer. It passes with clang v16 -O0, but fails
> with 17 and 18 only when built with -O0..

I've just started looking into this, but the difference in code generated
for _mm512_castsi128_si512() between gcc, clang 16, and clang 17 looks
interesting.

-- 
nathan

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