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Re: Optimize Arm64 crc32c implementation in Postgresql - Mailing list pgsql-hackers

From Thomas Munro
Subject Re: Optimize Arm64 crc32c implementation in Postgresql
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Msg-id CAEepm=0AH=z81xcciH37VCMKNhy7sxXn0eDJaL+FRdDV-z_VtQ@mail.gmail.com
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In response to Re: Optimize Arm64 crc32c implementation in Postgresql  (Thomas Munro <thomas.munro@enterprisedb.com>)
Responses Re: Optimize Arm64 crc32c implementation in Postgresql  (Thomas Munro <thomas.munro@enterprisedb.com>)
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On Wed, Apr 4, 2018 at 11:47 PM, Thomas Munro
<thomas.munro@enterprisedb.com> wrote:
> BTW I did some googling just now and found out that some libraries use
> a technique they call "CPU probing": just try it and see if you get
> SIGILL.  Is that a bad idea for some reason?  Here is a quick hack --
> anyone got an ARM system without crc that they could test it on?

Hmm.  I suppose there must be some horrendous non-portable 'step over
the instruction' bit missing in the signal handler.  Probably not a
great idea.

-- 
Thomas Munro
http://www.enterprisedb.com

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