[Bug c++/70641] New: ICE on valid code at -O1 and above on x86_64-linux-gnu: verify_gimple failed

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70641

            Bug ID: 70641
           Summary: ICE on valid code at -O1 and above on
                    x86_64-linux-gnu: verify_gimple failed
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu
  Target Milestone: ---

The following code causes an ICE when compiled with the current GCC trunk at
-O1 and above on x86_64-linux-gnu in both 32-bit and 64-bit modes.  

This is a regression from 5.3.x.


$ g++-trunk -v
Using built-in specs.
COLLECT_GCC=g++-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/usr/local/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 6.0.0 20160412 (experimental) [trunk revision 234895] (GCC) 
$ 
$ g++-trunk -O0 -c small.cpp
$ g++-5.3 -O1 -c small.cpp
$ 
$ g++-trunk -O1 -c small.cpp
small.cpp: In function ‘void foo()’:
small.cpp:9:1: error: statement marked for throw, but doesn’t
 }
 ^
# .MEM_2 = VDEF <.MEM_1(D)>
foo ();
small.cpp:9:1: internal compiler error: verify_gimple failed
0xd9bd4f verify_gimple_in_cfg(function*, bool)
        ../../gcc-source-trunk/gcc/tree-cfg.c:5125
0xc8a392 execute_function_todo
        ../../gcc-source-trunk/gcc/passes.c:1958
0xc8ac7b execute_todo
        ../../gcc-source-trunk/gcc/passes.c:2010
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.
$ 


-----------------------------


void foo ()
{
  try { 
    foo ();
  }
  catch ( ... ) { 
    __builtin_abort ();
  }
}