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Date: Thu, 30 Sep 2010 18:44:29 -0400
From: Jack Howarth <howarth@bromo.med.uc.edu>
To: Sebastian Pop <sebpop@gmail.com>
Cc: gcc-patches@gcc.gnu.org, gcc-graphite <gcc-graphite@googlegroups.com>
Subject: Re: [PATCH 00/44] Merge changes from Graphite branch to trunk
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On Thu, Sep 30, 2010 at 05:18:03PM -0500, Sebastian Pop wrote:
> On Thu, Sep 30, 2010 at 17:04, Jack Howarth <howarth@bromo.med.uc.edu> wrote:
> >    What are the prospects for getting PR40979 fixed?
> 
> > PR40979: induct benchmark 60% slower when compiled with -fgraphite-identity
> 
> Is this still a problem?  Could you try to measure the perf with trunk?
> 
> Thanks,
> Sebastian

Sebastian,

gfortran -ffast-math -funroll-loops -msse3 -O3 induct.f90 -o induct
time ./induct
20.290u 0.029s 0:20.37 99.7%	0+0k 0+1io 0pf+0w

gfortran -ffast-math -funroll-loops -msse3 -O3 -fno-graphite-identity induct.f90 -o induct
time ./induct
12.761u 0.025s 0:12.78 100.0%	0+0k 0+0io 0pf+0w

for current gcc trunk built with...


        Jack

Index: gcc/opts.c
===================================================================
--- gcc/opts.c	(revision 164815)
+++ gcc/opts.c	(working copy)
@@ -804,6 +804,9 @@
 
   /* -O2 optimizations.  */
   opt2 = (optimize >= 2);
+#ifdef HAVE_cloog
+  flag_graphite_identity = opt2;
+#endif
   flag_inline_small_functions = opt2;
   flag_indirect_inlining = opt2;
   flag_partial_inlining = opt2;