| From: | Greg Stark <gsstark(at)mit(dot)edu> |
|---|---|
| To: | John Regehr <regehr(at)cs(dot)utah(dot)edu> |
| Cc: | pgsql-bugs(at)postgresql(dot)org |
| Subject: | Re: BUG #5592: list of integer undefined behaviors |
| Date: | 2010-08-03 00:39:09 |
| Message-ID: | AANLkTi=_3BNR==jwRgP=petrdGfeSA_+s8_CtdSK=TcD@mail.gmail.com |
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| Thread: | |
| Lists: | pgsql-bugs |
On Mon, Aug 2, 2010 at 7:16 PM, John Regehr <regehr(at)cs(dot)utah(dot)edu> wrote:
> <nabstime.c, (1193:21)> : Op: -, Reason : Signed Subtraction Overflow,
> BINARY OPERATION: left (int32): 2147483644 right (int32): -2147483648
>
> <nabstime.c, (1194:21)> : Op: -, Reason : Signed Subtraction Overflow,
> BINARY OPERATION: left (int32): 2147483644 right (int32): -2147483648
>
These seem to imply that tinterval can contain a start point greater
than its end point. I'm not familiar with the rep invariant of
tinterval well enough to know if that's true or an indication of a bug
elsewhere. I suppose it doesn't matter for cmp since it's still
assigning an arbitrary position in the range to the interval.
--
greg
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