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[Bug rtl-optimization/50063] [4.6/4.7 Regression] DSE: wrong code for gcc.dg/torture/pta-ptrarith-3.c
- From: "gjl at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 19 Dec 2011 23:24:13 +0000
- Subject: [Bug rtl-optimization/50063] [4.6/4.7 Regression] DSE: wrong code for gcc.dg/torture/pta-ptrarith-3.c
- Auto-submitted: auto-generated
- References: <bug-50063-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50063
--- Comment #15 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-12-19 23:24:13 UTC ---
(In reply to comment #14)
> Well, it is certainly desirable not to process the prologue insns during
> init_alias_analysis. The fact that stack pointer has the same value as frame
> pointer after the prologue is not usual and something the generic code isn't
> prepared for.
So bottom line is that GCC is not ready for AVR?
> So you need to tell the alias analysis about that, as the prologue isn't
> scanned, it is the backend responsibility to tell that.
Ya, I skimmed the hooks once again... What hook needs to be
implemented/adjusted by AVR backend to ship that information if prologue and
elimination information is not enough already...?