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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/55760] scalar code non using rsqrtss and rcpss Date: Thu, 20 Dec 2012 15:59:00 -0000 [thread overview] Message-ID: <bug-55760-4-4A96yJgNxZ@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-55760-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55760 --- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> 2012-12-20 15:58:55 UTC --- (In reply to comment #2) > Thanks. > not safe meaning producing incorrect results? Yes. > Is it documented? See the documentation for -mrecip: ... Note that while the throughput of the sequence is higher than the throughput of the non-reciprocal instruction, the precision of the sequence can be decreased by up to 2 ulp (i.e. the inverse of 1.0 equals 0.99999994). ...
next prev parent reply other threads:[~2012-12-20 15:59 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-12-20 15:49 [Bug tree-optimization/55760] New: " vincenzo.innocente at cern dot ch 2012-12-20 15:52 ` [Bug tree-optimization/55760] " rguenth at gcc dot gnu.org 2012-12-20 15:55 ` vincenzo.innocente at cern dot ch 2012-12-20 15:59 ` rguenth at gcc dot gnu.org [this message] 2012-12-20 16:07 ` dominiq at lps dot ens.fr 2013-01-08 15:29 ` vincenzo.innocente at cern dot ch 2013-01-08 23:55 ` glisse at gcc dot gnu.org 2021-08-07 22:59 ` pinskia at gcc dot gnu.org
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