| From: | Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Yuya Watari <watari(dot)yuya(at)gmail(dot)com>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Keep compiler silence (clang 10, implicit conversion from 'long' to 'double' ) |
| Date: | 2019-11-06 04:08:33 |
| Message-ID: | 87h83hlkkj.fsf@news-spur.riddles.org.uk |
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| Thread: | |
| Lists: | pgsql-hackers |
>>>>> "Tom" == Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> writes:
>> But PostgreSQL effectively requires IEEE 754 since commit
>> 02ddd499322ab6f2f0d58692955dc9633c2150fc, right?
Tom> That commit presumes that floats follow the IEEE bitwise
Tom> representation, I think;
Correct. (It notably does _not_ make any assumptions about how floating
point arithmetic or comparisons work - all the computation is done in
integers.)
Tom> but it's a long way from there to assuming that float comparisons
Tom> do something that is explicitly *not* promised by C99.
I agree.
--
Andrew (irc:RhodiumToad)
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