[Bug tree-optimization/62091] [5 Regression] ice in before_dom_children

["dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62091

--- Comment #7 from David Binderman <dcb314 at hotmail dot com> ---
I am not sure this is fixed. Attached code, when
compiled by 20140817, with flags -std=gnu++11 -O2,
does the following

$ ../results/bin/gcc -c -std=gnu++11 -O2 bug161.cc
listformatter.cpp: In member function ‘icu_53::UnicodeString&
icu_53::ListFormatter::format(const icu_53::UnicodeString*, int32_t,
icu_53::UnicodeString&, int32_t, int32_t&, UErrorCode&) const’:
listformatter.cpp:304:16: internal compiler error: in before_dom_children, at
tree-ssa-pre.c:4410
0xbecf2c eliminate_dom_walker::before_dom_children(basic_block_def*)
    ../../src/trunk/gcc/tree-ssa-pre.c:4410
0xf72c67 dom_walker::walk(basic_block_def*)
    ../../src/trunk/gcc/domwalk.c:177
0xbe9fd2 eliminate
    ../../src/trunk/gcc/tree-ssa-pre.c:4525
0xbeb1dc execute
    ../../src/trunk/gcc/tree-ssa-pre.c:4940
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
$
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From: "vp at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/55334] [4.8/4.9/5 Regression] mgrid regression (ipa-cp disables vectorization)
Date: Tue, 19 Aug 2014 15:21:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idU334

vp at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |vp at gcc dot gnu.org

--- Comment #37 from vp at gcc dot gnu.org ---
I see this issue in AArch64 as well on 4.9 branch and on the trunk causing
performance regression.

Since MG3P is inlined at MAIN__, all the four calls to RESID are in MAIN__. Two
of which are to the clone resid_.constprop.1 (not vectorized) and one to resid_
(vectorized) and the last one inlined (not vectorized and it looks very similar
to the resid_.constprop.1 version).

I could however, improve by passing -fno-inline-functions and -fno-ipa-cp at
-Ofast (so that all the calls are to resid_ which gets vectorized).

Anyone working on this issue?