From: Roman Kononov <kononov195-pgsql@yahoo.com>
To: Bruce Momjian <bruce@momjian.us>
Cc: PostgreSQL-patches <pgsql-patches@postgresql.org>
Subject: Re: [BUGS] BUG #2846: inconsistent and confusing handling of underflows,
Date: Wed, 27 Dec 2006 15:43:49 -0600
Message-ID: <4592E915.4050901@yahoo.com> (raw)
In-Reply-To: <200612272123.kBRLNdg05533@momjian.us>
References: <200612272123.kBRLNdg05533@momjian.us>
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:
~>uname -a
Linux rklinux 2.6.15-27-amd64-generic #1 SMP PREEMPT Fri Dec 8 17:50:54 UTC 2006 x86_64 GNU/Linux
~>gcc --version
gcc (GCC) 4.3.0 20061213 (experimental)
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
~>cat test.c
#include <stdio.h>
#include <stdlib.h>
int
main(int argc, char *argv[])
{
float a = 1e30, b = 1e30;
double c;
c = a * b;
printf("%e\n", c);
return 0;
}
~>gcc test.c
~>./a.out
inf
~>gcc -march=i386 -m32 test.c
~>./a.out
1.000000e+60
Roman
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To: pgsql-hackers@postgresql.org
Cc: kononov195-pgsql@yahoo.com, bruce@momjian.us, pgsql-patches@postgresql.org
Subject: Re: [BUGS] BUG #2846: inconsistent and confusing handling of underflows,
In-Reply-To: <4592E915.4050901@yahoo.com>
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