Horton

Re: Detection of hadware feature => please do not use signal

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Thomas Munro <thomas.munro@gmail.com>
Cc: Heikki Linnakangas <hlinnaka@iki.fi>, Bastien Roucariès <rouca@debian.org>, pgsql-bugs@lists.postgresql.org
Date: 2024-11-25T17:53:58Z
Lists: pgsql-bugs 
I wrote:
> Also, there's no +fp option for "-march=armv8-a" because the
> ARMv8 specs require chips to implement both or neither of FP
> and SIMD.  So the idiomatic thing for us to write is not a
> separate -mfpu spec but "-march=armv8-a+crc+simd".  I'll
> adjust my patch to do it like that and push later today.

And done.  In the event I decided to try the +simd option first,
reasoning that that's correct on the majority of current ARM systems.
I'm interested to see what the older buildfarm ARM animals pick.

			regards, tom lane

Commits

  1. Update configure probes for CFLAGS needed for ARM CRC instructions.

  2. Support runtime CRC feature probing on NetBSD/ARM using sysctl().

  3. Use auxv to check for CRC32 instructions on ARM.

  4. Improve our method for probing the availability of ARM CRC instructions.