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[Bug math/24346] log() returns with excess precision with x87
- From: "joseph at codesourcery dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Fri, 15 Mar 2019 18:10:14 +0000
- Subject: [Bug math/24346] log() returns with excess precision with x87
- Auto-submitted: auto-generated
- References: <bug-24346-131@http.sourceware.org/bugzilla/>
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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