Horton

Re: SerializeParamList vs machines with strict alignment

Thomas Munro <thomas.munro@enterprisedb.com>

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From: Thomas Munro <thomas.munro@enterprisedb.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Amit Kapila <amit.kapila16@gmail.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>, Heikki Linnakangas <hlinnaka@iki.fi>
Date: 2018-10-01T22:47:48Z
Lists: pgsql-hackers 
On Tue, Oct 2, 2018 at 9:49 AM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Apparently the only somewhat-modern architecture that is resolutely
> unaligned-unfriendly is MIPS.

It's been a few years now since I worked on that architecture, but
Sparc is somewhat-modern and resolutely unaligned-unfriendly.  It's
just that you can optionally install a trap handler that will do super
slow non-atomic misaligned access in software instead of blowing up
with SIGBUS.  With the Sun toolchain you did that explicitly by
building with -misalign (though it's possible that more recent
compilers might be doing that without being asked?).

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

Commits

  1. MAXALIGN the target address where we store flattened value.

  2. Test passing expanded-value representations to workers.