[Bug tree-optimization/79284] New: ICE on valid code at -O3 on x86_64-linux-gnu: verify_gimple failed

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79284

            Bug ID: 79284
           Summary: ICE on valid code at -O3 on x86_64-linux-gnu:
                    verify_gimple failed
           Product: gcc
           Version: unknown
            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: ---

This seems to be a recent regression. 

$ 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/7.0.1/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 7.0.1 20170130 (experimental) [trunk revision 245020] (GCC)
$
$ gcc-trunk -O2 -c small.c
$
$ gcc-trunk -O3 -c small.c
small.c: In function ‘fn1’:
small.c:8:6: error: type mismatch in binary expression
 void fn1 (int p)
      ^~~
vector(4) <unnamed type>

vector(4) <unnamed type>

vector(16) unsigned char

mask__5.10_9 = mask__3.9_16 ^ vect_cst__10;
small.c:8:6: internal compiler error: verify_gimple failed
0xc6143f verify_gimple_in_cfg(function*, bool)
        ../../gcc-source-trunk/gcc/tree-cfg.c:5266
0xb35752 execute_function_todo
        ../../gcc-source-trunk/gcc/passes.c:1966
0xb36109 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.
$


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


struct
{ 
  unsigned a:1;
} b;

int c[5];

void fn1 (int p)
{ 
  char e = 4, f;
  for (; e; e--)
    f = (c[e] && ~0) != b.a;
  while (1)
    fn1 (f);
}