Re: [HACKERS] Warning!!

Bruce Momjian <maillist@candle.pha.pa.us>

From: Bruce Momjian <maillist@candle.pha.pa.us>
To: lockhart@alumni.caltech.edu (Thomas G. Lockhart)
Cc: james@vrtx.net, scrappy@hub.org, darcy@druid.net, pgsql-hackers@postgreSQL.org
Date: 1998-11-04T14:02:54Z
Lists: pgsql-hackers
> > I'm very new to this list, and I have to first say that 6.4beta5 fixes
> > every problem I had encountered with 6.3.2 (A small list..)
> > Just now I saw and posted this...
> > If the pence is 0-4 it rounds down... surely that's a rounding bug 
> > because it should be looking at the next significant figure?
> 
> tgl=> select cash_mul_flt8('$123.77', '1');
> cash_mul_flt8
> -------------
> $123.77
> (1 row)
> 
> tgl=> select cash_mul_flt8('$1', '123.77');
> cash_mul_flt8
> -------------
> $123.76
> (1 row)
> 
> That's annoying; it's non-symmetric too. The money type is stored as an
> integer, and the float type is an IEEE double; looks like we have an LSB
> rounding problem. Not sure what to do about it other than remove the
> function, which isn't desirable I'm sure...

This is really bad.  I can't imagine a 5-digit double is loosing
rounding on a double.  There must be some other problem, but I can't
reproduce it here on BSD/OS.

-- 
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