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[Bug tree-optimization/54899] [4.7 Regression] -fpredictive-commoning and -ftree-vectorize optimizations generate a nonsensical binary which segfaults
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 11 Oct 2012 13:57:50 +0000
- Subject: [Bug tree-optimization/54899] [4.7 Regression] -fpredictive-commoning and -ftree-vectorize optimizations generate a nonsensical binary which segfaults
- Auto-submitted: auto-generated
- References: <bug-54899-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54899
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Known to work| |4.6.4, 4.8.0
Keywords| |wrong-code
Last reconfirmed| |2012-10-11
Component|c++ |tree-optimization
Ever Confirmed|0 |1
Summary|-fpredictive-commoning and |[4.7 Regression]
|-ftree-vectorize |-fpredictive-commoning and
|optimizations generate a |-ftree-vectorize
|nonsensical binary which |optimizations generate a
|segfaults |nonsensical binary which
| |segfaults
Target Milestone|--- |4.7.3
Known to fail| |4.7.2
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> 2012-10-11 13:57:50 UTC ---
predcom introduces
D.2600_40 = MEM[(const double &)D.2413_2].mData[4294967295];
D.2601_38 = MEM[(const double &)D.2413_2].mData[0];
D.2602_19 = MEM[(const double &)D.2413_2].mData[1];
this is mData[-1], a reconstructed array access, D.2413_2 is &this_1(D)->b.
Not sure how predcom arrives at this ... on trunk there is no predcom
performed and Instead the base is this_1(D) + 24.