[Bug middle-end/57412] New: [4.9 Regression] ICE: in verify_loop_structure, at cfgloop.c:1647: loop 1's latch does not have an edge to its header with -fopenmp -fipa-pure-const

[zsojka at seznam dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57412

            Bug ID: 57412
           Summary: [4.9 Regression] ICE: in verify_loop_structure, at
                    cfgloop.c:1647: loop 1'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 30190
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30190&action=edit
reduced testcase

Compiler output:
$ gcc -fopenmp -fipa-pure-const testcase.C 
testcase.C: In function '<built-in>':
testcase.C:8:1: error: loop 1's latch does not have an edge to its header
 }
 ^
testcase.C:8:1: internal compiler error: in verify_loop_structure, at
cfgloop.c:1647
0x8513ae verify_loop_structure()
        /mnt/svn/gcc-trunk/gcc/cfgloop.c:1647
0xa7e928 loop_optimizer_init(unsigned int)
        /mnt/svn/gcc-trunk/gcc/loop-init.c:110
0x12fb799 analyze_function
        /mnt/svn/gcc-trunk/gcc/ipa-pure-const.c:786
0x12fbe69 generate_summary
        /mnt/svn/gcc-trunk/gcc/ipa-pure-const.c:929
0xaf70de execute_ipa_summary_passes(ipa_opt_pass_d*)
        /mnt/svn/gcc-trunk/gcc/passes.c:2136
0x872db0 ipa_passes
        /mnt/svn/gcc-trunk/gcc/cgraphunit.c:1903
0x872db0 compile()
        /mnt/svn/gcc-trunk/gcc/cgraphunit.c:1999
0x872fe9 finalize_compilation_unit()
        /mnt/svn/gcc-trunk/gcc/cgraphunit.c:2127
0x685040 cp_write_global_declarations()
        /mnt/svn/gcc-trunk/gcc/cp/decl2.c:4327
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-199312-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-199312-lto-fortran-checking-yes-rtl-df/
--without-cloog --without-ppl
Thread model: posix
gcc version 4.9.0 20130524 (experimental) (GCC) 

Tested revisions:
r199312 - fail
4.8 r198018 - OK