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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/48739] [4.5/4.6/4.7 Regression] ICE in check_loop_closed_ssa_use() with "-ftree-parallelize-loops=2 -fno-tree-dominator-opts" Date: Fri, 19 Aug 2011 16:43:00 -0000 [thread overview] Message-ID: <bug-48739-4-HIFOwLoLVa@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-48739-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48739 Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jakub at gcc dot gnu.org Target Milestone|--- |4.5.4 Summary|ICE in |[4.5/4.6/4.7 Regression] |check_loop_closed_ssa_use() |ICE in |with |check_loop_closed_ssa_use() |"-ftree-parallelize-loops=2 |with |-fno-tree-dominator-opts" |"-ftree-parallelize-loops=2 | |-fno-tree-dominator-opts" --- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-08-19 16:38:45 UTC --- Simplified testcase: /* PR tree-optimization/48739 */ /* { dg-do compile } */ /* { dg-options "-O1 -ftree-parallelize-loops=2 -fno-tree-dominator-opts" } */ extern int g; extern void bar (void); int foo (int x) { int a, b, *c = (int *) 0; for (a = 0; a < 10; ++a) { bar (); for (b = 0; b < 5; ++b) { x = 0; c = &x; g = 1; } } *c = x; for (x = 0; x != 10; x++) ; return g; } Started with http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=149206 (before that the empty loop would be just removed). The bug seems to be that parloops pass requests TODO_rebuild_alias which changes x from TREE_ADDRESSABLE to a gimple var, but we are in loop closed SSA form at that point and nothing ensures that the optimized variable is put into loop closed SSA form.
next prev parent reply other threads:[~2011-08-19 16:39 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-04-23 7:36 [Bug tree-optimization/48739] New: " arthur.j.odwyer at gmail dot com 2011-08-19 16:43 ` jakub at gcc dot gnu.org [this message] 2011-08-19 16:58 ` [Bug tree-optimization/48739] [4.5/4.6/4.7 Regression] " jakub at gcc dot gnu.org 2011-08-19 18:04 ` jakub at gcc dot gnu.org 2011-08-19 23:05 ` rguenth at gcc dot gnu.org 2011-08-20 7:51 ` jakub at gcc dot gnu.org 2011-08-20 7:58 ` jakub at gcc dot gnu.org 2011-08-20 8:32 ` [Bug tree-optimization/48739] [4.5 " jakub at gcc dot gnu.org 2012-06-20 12:59 ` rguenth at gcc dot gnu.org 2012-07-02 9:51 ` rguenth at gcc dot gnu.org
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