[Bug tree-optimization/71987] New: ICE on valid code at -O1 and above on x86_64-linux-gnu: tree check: expected ssa_name, have addr_expr in get_ops, at tree-ssa-reassoc.c:3269

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71987

            Bug ID: 71987
           Summary: ICE on valid code at -O1 and above on
                    x86_64-linux-gnu: tree check: expected ssa_name, have
                    addr_expr in get_ops, at tree-ssa-reassoc.c:3269
           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.  

This is a regression from 6.1.x. 


$ 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 20160724 (experimental) [trunk revision 238696] (GCC) 
$ 
$ gcc-trunk -O0 small.c
$ gcc-6.1 -O1 small.c
$ 
$ gcc-trunk -O1 small.c
small.c: In function ‘fn2’:
small.c:8:6: internal compiler error: tree check: expected ssa_name, have
addr_expr in get_ops, at tree-ssa-reassoc.c:3269
 void fn2 ()
      ^~~
0xe7745c tree_check_failed(tree_node const*, char const*, int, char const*,
...)
        ../../gcc-source-trunk/gcc/tree.c:9742
0xd81c18 tree_check
        ../../gcc-source-trunk/gcc/tree.h:3023
0xd81c18 get_ops
        ../../gcc-source-trunk/gcc/tree-ssa-reassoc.c:3269
0xd882ba maybe_optimize_range_tests
        ../../gcc-source-trunk/gcc/tree-ssa-reassoc.c:3523
0xd8e8f1 reassociate_bb
        ../../gcc-source-trunk/gcc/tree-ssa-reassoc.c:5260
0xd8e187 reassociate_bb
        ../../gcc-source-trunk/gcc/tree-ssa-reassoc.c:5469
0xd8e187 reassociate_bb
        ../../gcc-source-trunk/gcc/tree-ssa-reassoc.c:5469
0xd90d3b do_reassoc
        ../../gcc-source-trunk/gcc/tree-ssa-reassoc.c:5583
0xd90d3b execute_reassoc
        ../../gcc-source-trunk/gcc/tree-ssa-reassoc.c:5670
0xd90d3b execute
        ../../gcc-source-trunk/gcc/tree-ssa-reassoc.c:5709
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, b, *c, *d;

short fn1 (int p1)
{
  return a ? p1 : a;
}

void fn2 ()
{
  int e, *f = &e;
  b = fn1 (d != &e);
  c = f;
}

int main ()
{
  fn2 ();
  return 0;
}