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From: "steven at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/57300] [4.8/4.9 Regression] statement in expression miscompiled at -O3 in 32-bit mode
Date: Thu, 16 May 2013 08:51:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57300

--- Comment #5 from Steven Bosscher <steven at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #4)
> Not sure if it is safe to run df_analyze when the cfg is gone (split5
> pass)

Well, it doesn't crash but it's not correct. Without basic block
pointers on the insns, even the scan problem doesn't run properly
anymore.

One of the target machine reorgs does this, FWIW.