[Bug c++/65509] [C++11] GCC rejects operator== with two distinct pointers as not constexpr

["daniel.kruegler at googlemail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65509

Daniel Krügler <daniel.kruegler at googlemail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |daniel.kruegler@googlemail.
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--- Comment #1 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
I agree that this code should be accepted. Interestingly, the compiler accepts
the code when the constexpr specifier of both i1 and i2 is removed.
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From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/65511] transform_to_exit_first_loop looses edge probabilities
Date: Sun, 22 Mar 2015 10:44:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide511

--- Comment #1 from vries at gcc dot gnu.org ---
tentative patch:
...
diff --git a/gcc/tree-cfg.c b/gcc/tree-cfg.c
index 0f5e428..837dbbd 100644
--- a/gcc/tree-cfg.c
+++ b/gcc/tree-cfg.c
@@ -6175,6 +6175,7 @@ gimple_duplicate_sese_tail (edge entry ATTRIBUTE_UNUSED,
edge exit ATTRIBUTE_UNU
   gphi *phi;
   tree def;
   struct loop *target, *aloop, *cloop;
+  int exit_prob = exit->probability;

   gcc_assert (EDGE_COUNT (exit->src->succs) == 2);
   exits[0] = exit;
@@ -6266,6 +6267,8 @@ gimple_duplicate_sese_tail (edge entry ATTRIBUTE_UNUSED,
edge exit ATTRIBUTE_UNU
   sorig = single_succ_edge (switch_bb);
   sorig->flags = exits[1]->flags;
   snew = make_edge (switch_bb, nentry_bb, exits[0]->flags);
+  snew->probability = exit_prob;
+  sorig->probability = REG_BR_PROB_BASE - exit_prob;

   /* Register the new edge from SWITCH_BB in loop exit lists.  */
   rescan_loop_exit (snew, true, false);
...