[Bug tree-optimization/71079] 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=71079

            Bug ID: 71079
           Summary: ICE on valid code at -O1 and above on
                    x86_64-linux-gnu: verify_gimple failed
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          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.


$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/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 7.0.0 20160511 (experimental) [trunk revision 236125] (GCC) 
$ 
$ gcc-trunk -O0 -c small.c
$         
$ gcc-trunk -O1 -c small.c
small.c: In function ‘fn1’:
small.c:10:1: error: type mismatch in binary expression
 }
 ^
unsigned int

int

unsigned int

_12 = a.0_1 ^ c.4_4;
small.c:10:1: internal compiler error: verify_gimple failed
0xbfe28f verify_gimple_in_cfg(function*, bool)
        ../../gcc-source-trunk/gcc/tree-cfg.c:5166
0xaecaa2 execute_function_todo
        ../../gcc-source-trunk/gcc/passes.c:1964
0xaed49b execute_todo
        ../../gcc-source-trunk/gcc/passes.c:2016
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.
$ 


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


int a; 
unsigned b, c; 

void
fn1 ()
{
  int d = 1, e, f;
  e = ~a ^ ~1;
  f = (b || d) ^ c ^ e;
}