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Re: [PATCH 00/44] Merge changes from Graphite branch to trunk
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...
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;
Jack