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From: "wschmidt at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/52976] [4.8 Regression] Revision 186384 breaks the polyhedron tests aermod.f90 and doduc.f90 at -O3 -ffast-math Date: Fri, 13 Apr 2012 19:46:00 -0000 [thread overview] Message-ID: <bug-52976-4-MiZYrpleq4@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-52976-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52976 --- Comment #3 from William J. Schmidt <wschmidt at gcc dot gnu.org> 2012-04-13 19:41:18 UTC --- When changing from the original form of the patch to the form that recorded repeated ops in the ops table, I missed the effect on undistribution where a term contains a multiply of a repeated op. Those terms should be excluded from undistribution to return to the former behavior, and I'll work on fixing that for the short term. However, it would eventually be better to factor a P out of the example in this case: c1 + 2.*P*c2 + 3.*P**2*c3 ==> c1 + P * (2.*c2 + 3.*P*c3) In the original form of the patch, this was handled naturally because P**2 was expanded into P*P and the existing logic was sufficient. I just missed the need to add some logic to undistribution.
next prev parent reply other threads:[~2012-04-13 19:46 UTC|newest] Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-04-13 15:49 [Bug tree-optimization/52976] New: " dominiq at lps dot ens.fr 2012-04-13 18:12 ` [Bug tree-optimization/52976] " dominiq at lps dot ens.fr 2012-04-13 19:07 ` wschmidt at gcc dot gnu.org 2012-04-13 19:46 ` wschmidt at gcc dot gnu.org [this message] 2012-04-13 20:47 ` wschmidt at gcc dot gnu.org 2012-04-13 22:11 ` dominiq at lps dot ens.fr 2012-04-14 15:06 ` wschmidt at gcc dot gnu.org 2012-04-14 15:14 ` wschmidt at gcc dot gnu.org 2012-04-14 16:54 ` wschmidt at gcc dot gnu.org 2012-04-15 10:42 ` dominiq at lps dot ens.fr 2012-04-16 9:47 ` rguenth at gcc dot gnu.org 2012-04-16 12:16 ` wschmidt at gcc dot gnu.org 2012-04-16 12:18 ` wschmidt at gcc dot gnu.org 2012-04-16 13:24 ` rguenth at gcc dot gnu.org 2012-04-16 13:54 ` vincenzo.innocente at cern dot ch 2012-04-16 13:58 ` rguenther at suse dot de 2012-04-18 10:46 ` rguenth at gcc dot gnu.org 2012-04-18 12:31 ` wschmidt at gcc dot gnu.org 2012-04-18 12:49 ` wschmidt at gcc dot gnu.org
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