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[Bug tree-optimization/53226] [4.8 Regression] Endless loop in forwprop
- From: "jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 09 May 2012 12:19:41 +0000
- Subject: [Bug tree-optimization/53226] [4.8 Regression] Endless loop in forwprop
- Auto-submitted: auto-generated
- References: <bug-53226-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53226
--- Comment #15 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-05-09 12:19:41 UTC ---
Author: jakub
Date: Wed May 9 12:19:34 2012
New Revision: 187328
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=187328
Log:
PR tree-optimization/53226
* tree-ssa-forwprop.c (ssa_forward_propagate_and_combine): Remove
prev and prev_initialized vars, gimple_set_plf (stmt, GF_PLF_1, false)
before processing it and gimple_set_plf (stmt, GF_PLF_1, true) if it
doesn't need to be revisited, look for earliest stmt with
!gimple_plf (stmt, GF_PLF_1) if something changed.
* gcc.c-torture/compile/pr53226.c: New test.
Added:
trunk/gcc/testsuite/gcc.c-torture/compile/pr53226.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-forwprop.c