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[Bug target/32392] Support using -mrecip w/o additional Newton-Raphson run
- From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 19 Jun 2007 09:15:09 -0000
- Subject: [Bug target/32392] Support using -mrecip w/o additional Newton-Raphson run
- References: <bug-32392-13404@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #2 from rguenth at gcc dot gnu dot org 2007-06-19 09:15 -------
Confirmed. For 2 NR steps to reach double precision (we'd miss it by some more
ulps than the 2.5 for float precision) we would need to do at least the second
NR in double precision. Note that this would make sense only for double
precision input values that are exactly representable in float precision
(otherwise, why the extra precision?). So practically not worth it.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenth at gcc dot gnu dot
| |org
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2007-06-19 09:15:09
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32392