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Subject: [Bug 216467] [request] Hardware (SSE 4.2) CRC32C support in
 calculate_crc32c()
Date: Wed, 25 Jan 2017 21:33:04 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D216467

Conrad Meyer <cem@freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |cem@freebsd.org

--- Comment #2 from Conrad Meyer <cem@freebsd.org> ---
We have a patch for this at Isilon.

Unfortunately, our assembly CRC32C implementations are privately licensed I=
ntel
code we can't share.  Do you have a permissively licensed replacement we co=
uld
use in FreeBSD?

There are two algorithms.  One algorithm just uses SSE4.2 instructions and =
no
FPU; that's generally usable in the kernel.  There is another algorithm that
also uses PCLMULQDQ (FPU) which is less generally suitable for the kernel, =
but
an option if the thread is already preserving FPU state.

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