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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/49749] Reassociation rank algorithm does not include all non-NULL operands Date: Wed, 20 Jul 2011 19:02:00 -0000 [thread overview] Message-ID: <bug-49749-4-gGUYWlAzwm@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-49749-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49749 --- Comment #11 from William J. Schmidt <wschmidt at gcc dot gnu.org> 2011-07-20 19:01:30 UTC --- I forgot to mention some justification for the value of PHI_LOOP_BIAS, and I notice it has a misleading comment by it at the moment. The value is a constant that should be larger than the depth of the largest expected reassociation tree, but generally smaller than twice the rank of the basic block. The intent is to limit the effect to single-block loops for now. One of the questions I have is whether the bias should be allowed for more complex innermost loops. PHI_LOOP_BIAS is a crude method and something more refined is probably needed, but it serves to demonstrate the viability of the general approach.
next prev parent reply other threads:[~2011-07-20 19:02 UTC|newest] Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-07-14 16:51 [Bug tree-optimization/49749] New: " wschmidt at gcc dot gnu.org 2011-07-14 19:23 ` [Bug tree-optimization/49749] " wschmidt at gcc dot gnu.org 2011-07-14 19:23 ` wschmidt at gcc dot gnu.org 2011-07-14 19:27 ` wschmidt at gcc dot gnu.org 2011-07-14 19:28 ` wschmidt at gcc dot gnu.org 2011-07-14 19:30 ` wschmidt at gcc dot gnu.org 2011-07-15 20:16 ` wschmidt at gcc dot gnu.org 2011-07-15 20:21 ` wschmidt at gcc dot gnu.org 2011-07-18 9:11 ` rguenth at gcc dot gnu.org 2011-07-20 16:30 ` wschmidt at gcc dot gnu.org 2011-07-20 16:39 ` wschmidt at gcc dot gnu.org 2011-07-20 19:02 ` wschmidt at gcc dot gnu.org [this message] 2011-07-21 12:07 ` rguenth at gcc dot gnu.org 2011-07-21 18:09 ` wschmidt at gcc dot gnu.org 2011-07-21 20:28 ` wschmidt at gcc dot gnu.org 2011-07-29 18:41 ` wschmidt at gcc dot gnu.org 2011-07-31 19:00 ` wschmidt at gcc dot gnu.org 2011-07-31 19:01 ` wschmidt at gcc dot gnu.org 2021-09-28 12:11 ` cvs-commit at gcc dot gnu.org
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