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From: "amker at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/62173] [5/6 Regression] 64bit Arch can't ivopt while 32bit Arch can
Date: Fri, 13 Mar 2015 08:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62173

--- Comment #38 from amker at gcc dot gnu.org ---
The first patch actually helping this case is at
https://gcc.gnu.org/ml/gcc-patches/2015-02/msg00836.html

But the real problem lies in scev/ivopt about how type conversion and scev
overflow are handled.  I am working on this.

According to Richard, both the patch and the real fix are stage1 stuff.  That's
why it has been quite recently.