From: Roman Kononov <kononov195-pgsql@yahoo.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-hackers@postgresql.org, Bruce Momjian <bruce@momjian.us>
Cc: PostgreSQL-patches <pgsql-patches@postgresql.org>
Subject: Re: [BUGS] BUG #2846: inconsistent and confusing handling
Date: Wed, 27 Dec 2006 17:47:05 -0600
Message-ID: <459305F9.1060403@yahoo.com> (raw)
In-Reply-To: <25444.1167261571@sss.pgh.pa.us>
References: <200612272123.kBRLNdg05533@momjian.us>
<4592E915.4050901@yahoo.com>
<25444.1167261571@sss.pgh.pa.us>
On 12/27/2006 05:19 PM, 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.
You are right provided that you want to ignore underflows and silently
produce zeros instead.
If you go this way, I recommend to ignore overflows as well, and silently
produce infinities and NaNs.
Roman
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To: pgsql-hackers@postgresql.org
Cc: kononov195-pgsql@yahoo.com, tgl@sss.pgh.pa.us, bruce@momjian.us, pgsql-patches@postgresql.org
Subject: Re: [BUGS] BUG #2846: inconsistent and confusing handling
In-Reply-To: <459305F9.1060403@yahoo.com>
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