Re: [BUGS] BUG #2846: inconsistent and confusing - Mailing list pgsql-patches

From Bruce Momjian
Subject Re: [BUGS] BUG #2846: inconsistent and confusing
Date
Msg-id 200612280142.kBS1gRE16680@momjian.us
Whole thread Raw
In response to Re: [BUGS] BUG #2846: inconsistent and confusing handling of underflows,  (Tom Lane <tgl@sss.pgh.pa.us>)
List pgsql-patches
Tom Lane wrote:
> Roman Kononov <kononov195-pgsql@yahoo.com> writes:
> > On 12/27/2006 03:23 PM, Bruce Momjian wrote:
> >> Are you sure?  As I remember, computation automatically upgrades to
> >> 'double'.  See this program and output:
>
> > This is platform- and compiler- dependent:
>
> ... and probably irrelevant, too.  We should store the result into a
> float4 variable and then test for isinf() on that; that eliminates the
> question of whether the compiler did the multiply in a wider format or
> not.

True for overflow to Infinity, but underflow checking is better for
float4 using float8.  See previous email for details.

--
  Bruce Momjian   bruce@momjian.us
  EnterpriseDB    http://www.enterprisedb.com

  + If your life is a hard drive, Christ can be your backup. +

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