| From: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | emre(at)hasegeli(dot)com, Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: [PATCH] Improve geometric types |
| Date: | 2018-09-26 21:09:07 |
| Message-ID: | 0999e487-9842-dedf-4a7d-4c8366fe7af5@2ndquadrant.com |
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| Lists: | pgsql-hackers |
On 09/26/2018 10:58 PM, Tom Lane wrote:
> Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> writes:
>> Hmmm, interesting. It seems both failures happen in the chunk that
>> multiplies paths with points, i.e. essentially point_mul_point. So it
>> seems most platforms end up with
>
>> (0,0) * (-3,4) = (-0, 0)
>
>> while gaur apparently thinks it's (0,0). And indeed, that's what the
>> attached trivial program does - I'd bet if you run it on gaur, it'll
>> print 0.000000, not -0.000000.
>
> Nope, no cigar:
>
> $ gcc -Wall -O2 test.c
> $ ./a.out
> -0.000000
>
> (I tried a couple other -O levels to see if that affected anything,
> but it didn't.)
>
Interesting ...
> I'll try to isolate the problem more closely, but it will take awhile.
> That machine is slow :-(
>
OK, thanks.
regards
--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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