From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
Cc: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: new clang report |
Date: | 2011-05-05 19:51:34 |
Message-ID: | 8587.1304625094@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Peter Eisentraut <peter_e(at)gmx(dot)net> writes:
> Btw., when you build a simple test program in the default mode, pow()
> indeed returns Inf on overflow. There appear to be some code generation
> or optimization problems when it builds the postgres code, because the
> problem goes away with either -O0 or by inserting an elog or something
> like that after the pow() call.
Hmm. Sounds to me like clang is trying to insert an inlined version of
pow() that gets this case wrong. Any of -fmath-errno, -O0, or possibly
other things discourage it from doing that, and then the non-inline code
gets it right. Bug for sure.
regards, tom lane
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