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[Bug math/24346] log() returns with excess precision with x87


https://sourceware.org/bugzilla/show_bug.cgi?id=24346

--- Comment #2 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
In the presence of Annex F, F.6 says the return statement must remove 
excess precision.

glibc of course is not built with -fexcess-precision=standard and library 
functions need not behave as if written in standard C.  The question is 
whether we should have math_narrow_eval calls for all return values that 
might have excess precision, not just where there might be excess range as 
well.

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