[Bug rtl-optimization/79150] New: ICE: in commit_one_edge_insertion, at cfgrtl.c:2077 for the gcc.dg/pr77834.c test

[toma.tabacu at imgtec dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79150

            Bug ID: 79150
           Summary: ICE: in commit_one_edge_insertion, at cfgrtl.c:2077
                    for the gcc.dg/pr77834.c test
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: toma.tabacu at imgtec dot com
  Target Milestone: ---

gcc.dg/pr77834.c has been failing on mips-mti-elf and mips-mti-linux-gnu with
the default options since around 7 November (I haven't checked, but I assume
it's since it was committed) with the following ICE:

gcc/gcc/testsuite/gcc.dg/pr77834.c: In function ‘foo’:
gcc/gcc/testsuite/gcc.dg/pr77834.c:18:1: internal compiler error: in
commit_one_edge_insertion, at cfgrtl.c:2077
 }
 ^
0x8e76c4 commit_one_edge_insertion(edge_def*)
        gcc/gcc/cfgrtl.c:2077
0x8c7665 execute
        gcc/gcc/cfgexpand.c:6430
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.

Here's the compiler version:

$ ~/obj-mips-mti-linux-gnu/gcc/gcc/xgcc -v
Using built-in specs.
COLLECT_GCC=~/obj-mips-mti-linux-gnu/gcc/gcc/xgcc
Target: mips-mti-linux-gnu
Configured with: ~/src/gcc/configure CFLAGS='-O0 -g3' CXXFLAGS='-O0 -g3'
--prefix=~/install-mips-mti-linux-gnu --disable-multilib
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --disable-libssp
--disable-libmudflap --disable-decimal-float --with-mips-plt
--target=mips-mti-linux-gnu --enable-languages=c,c++,fortran
--with-sysroot=~/install-mips-mti-linux-gnu/sysroot --enable-__cxa_atexit
--enable-checking=all
Thread model: posix
gcc version 7.0.0 20170119 (experimental) (GCC) 

I've looked into this a little, but I'd appreciate some help.
Sorry for being so late in reporting this.