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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/66119] [5/6 Regression] in optimization of avx-code
Date: Tue, 12 May 2015 10:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66119

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed by

Index: toplev.c
===================================================================
--- toplev.c    (revision 223044)
+++ toplev.c    (working copy)
@@ -1311,6 +1311,9 @@ process_options (void)
      so we can correctly initialize debug output.  */
   no_backend = lang_hooks.post_options (&main_input_filename);

+  /* Some machines may reject certain combinations of options.  */
+  targetm.target_option.override ();
+
   /* Set default values for parameters relation to the Scalar Reduction
      of Aggregates passes (SRA and IP-SRA).  We must do this here, rather
      than in opts.c:default_options_optimization as historically these
@@ -1325,9 +1328,6 @@ process_options (void)
      get_move_ratio (false) * UNITS_PER_WORD,
      global_options.x_param_values, global_options_set.x_param_values);

-  /* Some machines may reject certain combinations of options.  */
-  targetm.target_option.override ();
-
   /* Avoid any informative notes in the second run of -fcompare-debug.  */
   if (flag_compare_debug) 
     diagnostic_inhibit_notes (global_dc);

though not sure whether a 2nd maybe_set_param_value will still allow the
target to adjust this default...