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[Bug rtl-optimization/50904] [4.7 regression] pessimization when -fno-protect-parens is enabled by -Ofast
- From: "dominiq at lps dot ens.fr" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 02 Dec 2011 16:45:24 +0000
- Subject: [Bug rtl-optimization/50904] [4.7 regression] pessimization when -fno-protect-parens is enabled by -Ofast
- Auto-submitted: auto-generated
- References: <bug-50904-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50904
--- Comment #33 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-12-02 16:45:24 UTC ---
> The failing polyhedron 2005 benchmark is linpk which can be seen with -Ofast on
> x86_64-apple-darwin11...
>
> > Value= 25.114499300 Target= 23.100000000 Tolerance= 2.0000000000
> F
I think this test is not relevant: the "target" is already a residual error,
hence very sensitive to the way the computation is performed and a 10%
tolerance cannot be used to evaluate the "accuracy" of the residual.