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Subject: [Bug middle-end/40979] induct benchmark 60% slower when compiled with -fgraphite-identity
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40979

--- Comment #20 from Jack Howarth <howarth at nitro dot med.uc.edu> 2011-02-01 20:15:49 UTC ---
FYI, the patches in Comment 14 and 17 when also used with the patch...

Index: opts.c
===================================================================
--- opts.c      (revision 167318)
+++ opts.c      (working copy)
@@ -462,6 +462,9 @@
     { OPT_LEVELS_1_PLUS, OPT_fcombine_stack_adjustments, NULL, 1 },

     /* -O2 optimizations.  */
+#ifdef HAVE_cloog
+    { OPT_LEVELS_2_PLUS, OPT_fgraphite_identity, NULL, 1 },
+#endif
     { OPT_LEVELS_2_PLUS, OPT_finline_small_functions, NULL, 1 },
     { OPT_LEVELS_2_PLUS, OPT_findirect_inlining, NULL, 1 },
     { OPT_LEVELS_2_PLUS, OPT_fpartial_inlining, NULL, 1 },

shows that the vect.exp failures (PR 47048) for -fgraphite-identity at -O2 are
reduced from
the previous 129 at -m32 to only 24! So close to perfection...