[Bug tree-optimization/80443] New: ICE on valid code at -O2 on x86_64-linux-gnu: in set_value_range, at tree-vrp.c:367

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80443

            Bug ID: 80443
           Summary: ICE on valid code at -O2 on x86_64-linux-gnu: in
                    set_value_range, at tree-vrp.c:367
           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 appears 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 20170417 (experimental) [trunk revision 246948] (GCC)
$
$ gcc-trunk -Os -c small.c
$
$ gcc-trunk -O2 -c small.c
small.c: In function ‘fn1’:
small.c:8:6: internal compiler error: in set_value_range, at tree-vrp.c:367
 void fn1 ()
      ^~~
0xebf2a0 set_value_range
        ../../gcc-source-trunk/gcc/tree-vrp.c:367
0xebfd7b vrp_intersect_ranges_1
        ../../gcc-source-trunk/gcc/tree-vrp.c:8995
0xebfd7b vrp_intersect_ranges(value_range*, value_range*)
        ../../gcc-source-trunk/gcc/tree-vrp.c:9029
0xec31a3 update_value_range
        ../../gcc-source-trunk/gcc/tree-vrp.c:793
0xed5406 vrp_visit_phi_node
        ../../gcc-source-trunk/gcc/tree-vrp.c:9362
0xddaa28 simulate_stmt
        ../../gcc-source-trunk/gcc/tree-ssa-propagate.c:237
0xddc4f7 simulate_block
        ../../gcc-source-trunk/gcc/tree-ssa-propagate.c:363
0xddc4f7 ssa_propagate(ssa_prop_result (*)(gimple*, edge_def**, tree_node**),
ssa_prop_result (*)(gphi*))
        ../../gcc-source-trunk/gcc/tree-ssa-propagate.c:808
0xedddc1 execute_vrp
        ../../gcc-source-trunk/gcc/tree-vrp.c:11680
0xedddc1 execute
        ../../gcc-source-trunk/gcc/tree-vrp.c:11778
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$


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


struct
{ 
  int a:1;
} b, c;

char d, e, f;

void fn1 ()
{ 
  while (f)
    { 
      char g = b.a;
      if (g)
        b.a = ~(1 + (d || c.a));
      if (b.a < g && b.a)
        g = 0;
      if (b.a > c.a)
        b.a = g;
      c.a = e;
    }
}