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* [Bug middle-end/35290] Missing dead store elimination [not found] <bug-35290-4@http.gcc.gnu.org/bugzilla/> @ 2010-11-09 23:11 ` xinliangli at gmail dot com 2010-11-09 23:22 ` [Bug tree-optimization/35290] " pinskia at gcc dot gnu.org ` (2 subsequent siblings) 3 siblings, 0 replies; 4+ messages in thread From: xinliangli at gmail dot com @ 2010-11-09 23:11 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35290 --- Comment #2 from davidxl <xinliangli at gmail dot com> 2010-11-09 23:11:38 UTC --- This seems resolved in trunk gcc. David ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/35290] Missing dead store elimination [not found] <bug-35290-4@http.gcc.gnu.org/bugzilla/> 2010-11-09 23:11 ` [Bug middle-end/35290] Missing dead store elimination xinliangli at gmail dot com @ 2010-11-09 23:22 ` pinskia at gcc dot gnu.org 2010-11-10 12:32 ` rguenth at gcc dot gnu.org 2014-09-05 10:58 ` glisse at gcc dot gnu.org 3 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu.org @ 2010-11-09 23:22 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35290 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |TREE Last reconfirmed|2008-02-22 10:48:57 |2010-11-09 10:48:57 Component|middle-end |tree-optimization --- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> 2010-11-09 23:21:50 UTC --- The tree level DSE does not do it though. The RTL level has been fixed since the DF branch was merged in. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/35290] Missing dead store elimination [not found] <bug-35290-4@http.gcc.gnu.org/bugzilla/> 2010-11-09 23:11 ` [Bug middle-end/35290] Missing dead store elimination xinliangli at gmail dot com 2010-11-09 23:22 ` [Bug tree-optimization/35290] " pinskia at gcc dot gnu.org @ 2010-11-10 12:32 ` rguenth at gcc dot gnu.org 2014-09-05 10:58 ` glisse at gcc dot gnu.org 3 siblings, 0 replies; 4+ messages in thread From: rguenth at gcc dot gnu.org @ 2010-11-10 12:32 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35290 Richard Guenther <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |ASSIGNED AssignedTo|unassigned at gcc dot |rguenth at gcc dot gnu.org |gnu.org | --- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-11-10 12:32:16 UTC --- Well, it's not working on the tree level to make it cheaper: /* We deliberately stop on clobbering statements and not only on killing ones to make walking cheaper. Otherwise we can just continue walking until both stores have equal reference trees. */ while (!stmt_may_clobber_ref_p (temp, gimple_assign_lhs (stmt))); changing that to while (!stmt_kills_ref_p (temp, gimple_assign_lhs (stmt))); will make it work (and slower). Also needs (possibly unsafe in general if used cross loop iteration) Index: gcc/tree-ssa-alias.c =================================================================== --- gcc/tree-ssa-alias.c (revision 166526) +++ gcc/tree-ssa-alias.c (working copy) @@ -1577,7 +1577,12 @@ stmt_kills_ref_p_1 (gimple stmt, ao_ref base = get_ref_base_and_extent (lhs, &offset, &size, &max_size); /* We can get MEM[symbol: sZ, index: D.8862_1] here, so base == ref->base does not always hold. */ - if (base == ref->base) + if (base == ref->base + || (TREE_CODE (base) == MEM_REF + && TREE_CODE (ref->base) == MEM_REF + && TREE_OPERAND (base, 0) == TREE_OPERAND (ref->base, 0) + && tree_int_cst_equal (TREE_OPERAND (base, 1), + TREE_OPERAND (ref->base, 1)))) { /* For a must-alias check we need to be able to constrain the accesses properly. */ ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/35290] Missing dead store elimination [not found] <bug-35290-4@http.gcc.gnu.org/bugzilla/> ` (2 preceding siblings ...) 2010-11-10 12:32 ` rguenth at gcc dot gnu.org @ 2014-09-05 10:58 ` glisse at gcc dot gnu.org 3 siblings, 0 replies; 4+ messages in thread From: glisse at gcc dot gnu.org @ 2014-09-05 10:58 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=35290 Marc Glisse <glisse at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED CC| |glisse at gcc dot gnu.org Resolution|--- |FIXED Target Milestone|--- |5.0 --- Comment #5 from Marc Glisse <glisse at gcc dot gnu.org> --- This was fixed on trunk recently by Richard. ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2014-09-05 10:58 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- [not found] <bug-35290-4@http.gcc.gnu.org/bugzilla/> 2010-11-09 23:11 ` [Bug middle-end/35290] Missing dead store elimination xinliangli at gmail dot com 2010-11-09 23:22 ` [Bug tree-optimization/35290] " pinskia at gcc dot gnu.org 2010-11-10 12:32 ` rguenth at gcc dot gnu.org 2014-09-05 10:58 ` glisse at gcc dot gnu.org
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