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[Bug math/22906] new version of exp doesn't always round correctly
- From: "wdijkstr at arm dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Mon, 19 Mar 2018 17:46:38 +0000
- Subject: [Bug math/22906] new version of exp doesn't always round correctly
- Auto-submitted: auto-generated
- References: <bug-22906-131@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=22906
Wilco <wdijkstr at arm dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |wdijkstr at arm dot com
--- Comment #7 from Wilco <wdijkstr at arm dot com> ---
Note that while the max ULP error of exp is 1, the ULP error vs the infinitely
precise result is actually very close to 0.50 ULP, ie. most (>99%) of results
are correctly rounded. This is significantly better than the 1ULP max error
bound guarantees. Fixing that last 1% requires at least 100 times more effort
(as crlibm shows), and that's just not worth it for a general purpose math
library.
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