Re: What exactly is our CRC algorithm?

From: Abhijit Menon-Sen <ams(at)2ndQuadrant(dot)com>
To: Andres Freund <andres(at)2ndquadrant(dot)com>
Cc: pgsql-hackers(at)postgresql(dot)org, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>
Subject: Re: What exactly is our CRC algorithm?
Date: 2014-12-30 07:06:11
Views: Raw Message | Whole Thread | Download mbox | Resend email
Lists: pgsql-hackers

At 2014-12-29 18:44:18 +0530, ams(at)2ndQuadrant(dot)com wrote:
> > > +#ifdef __GNUC__
> > > + __asm__ ("crc32b %[data], %[crc]\n" : [crc] "+r" (crc) : [data] "rm" (data));
> >
> > Have you checked which version of gcc introduced named references to
> > input/output parameters?

OK, here we go:

«As of GCC version 3.1, it is also possible to specify input and
output operands using symbolic names which can be referenced within
the assembler code.»

GCC 3.1 was released on May 15, 2002. So it should be quite safe to use
this feature.

-- Abhijit

In response to

Browse pgsql-hackers by date

  From Date Subject
Next Message Abhijit Menon-Sen 2014-12-30 07:40:27 Re: What exactly is our CRC algorithm?
Previous Message Amit Kapila 2014-12-30 07:02:41 Re: Additional role attributes && superuser review