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From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/59152] New: [4.9 Regression] ICE: loop 2's latch does not have an edge to its header with -fopenmp -fipa-pure-const
Date: Sat, 16 Nov 2013 16:15:00 -0000
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X-Bugzilla-Version: 4.9.0
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59152

            Bug ID: 59152
           Summary: [4.9 Regression] ICE: loop 2's latch does not have an
                    edge to its header with -fopenmp -fipa-pure-const
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz

Created attachment 31229
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31229&action=edit
reduced testcase

Compiler output:
$ gcc -fopenmp -fipa-pure-const testcase.c
testcase.c: In function 'foo._omp_fn.0':
testcase.c:10:1: error: loop 2's latch does not have an edge to its header
 }
 ^
testcase.c:10:1: internal compiler error: in verify_loop_structure, at
cfgloop.c:1649
0x70b713 verify_loop_structure()
        /mnt/svn/gcc-trunk/gcc/cfgloop.c:1649
0x94fc5a loop_optimizer_init(unsigned int)
        /mnt/svn/gcc-trunk/gcc/loop-init.c:111
0x12facc3 analyze_function
        /mnt/svn/gcc-trunk/gcc/ipa-pure-const.c:781
0x12fb961 pure_const_generate_summary
        /mnt/svn/gcc-trunk/gcc/ipa-pure-const.c:924
0x9dd246 execute_ipa_summary_passes(ipa_opt_pass_d*)
        /mnt/svn/gcc-trunk/gcc/passes.c:2015
0x730265 ipa_passes
        /mnt/svn/gcc-trunk/gcc/cgraphunit.c:2014
0x730265 compile()
        /mnt/svn/gcc-trunk/gcc/cgraphunit.c:2121
0x7304b4 finalize_compilation_unit()
        /mnt/svn/gcc-trunk/gcc/cgraphunit.c:2275
0x5e3c63 c_write_global_declarations()
        /mnt/svn/gcc-trunk/gcc/c/c-decl.c:10374
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.

$ gcc -v
Using built-in specs.
COLLECT_GCC=/mnt/svn/gcc-trunk/binary-latest/bin/gcc
COLLECT_LTO_WRAPPER=/mnt/svn/gcc-trunk/binary-204897-lto-fortran-checking-yes-rtl-df/libexec/gcc/x86_64-unknown-linux-gnu/4.9.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: /mnt/svn/gcc-trunk//configure --enable-checking=yes,rtl,df
--enable-languages=c,c++,lto,fortran
--prefix=/mnt/svn/gcc-trunk/binary-204897-lto-fortran-checking-yes-rtl-df/
--without-cloog --without-ppl
Thread model: posix
gcc version 4.9.0 20131116 (experimental) (GCC) 

Tested revisions:
r204897 - crash
4.8 r204890 - OK