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[Bug tree-optimization/34683] [4.3 Regression] SSA rewriting in the loop unroller causes quadratic behavior
- 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: 10 Jan 2008 14:36:22 -0000
- Subject: [Bug tree-optimization/34683] [4.3 Regression] SSA rewriting in the loop unroller causes quadratic behavior
- References: <bug-34683-14773@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #38 from rguenth at gcc dot gnu dot org 2008-01-10 14:36 -------
Created an attachment (id=14908)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=14908&action=view)
hack to disable rewriting of VOPs
I tried to change the unroller doing only SSA_NAME replacement update after
each unrolling and leave rewriting the virtual operands to after the whole
pass but either I messed up or this even makes it worse ;) See the prototype
hack.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34683