[Bug tree-optimization/78721] New: ICE on valid code at -O2 and -O3 on x86_64-linux-gnu: in set_value_range, at tree-vrp.c:371

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78721

            Bug ID: 78721
           Summary: ICE on valid code at -O2 and -O3 on x86_64-linux-gnu:
                    in set_value_range, at tree-vrp.c:371
           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: ---

$ 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 20161206 (experimental) [trunk revision 243299] (GCC)
$
$ gcc-trunk -Os small.c
$ gcc-6.2 -O2 small.c
$
$ gcc-trunk -O2 small.c
small.c:20:1: internal compiler error: in set_value_range, at tree-vrp.c:371
 }
 ^
0xe97c9f set_value_range
        ../../gcc-source-trunk/gcc/tree-vrp.c:370
0xe99357 vrp_meet_1
        ../../gcc-source-trunk/gcc/tree-vrp.c:8711
0xe99357 vrp_meet(value_range*, value_range const*)
        ../../gcc-source-trunk/gcc/tree-vrp.c:8788
0x135f6f5 ipcp_vr_lattice::meet_with_1(value_range const*)
        ../../gcc-source-trunk/gcc/ipa-cp.c:909
0x136540f ipcp_vr_lattice::meet_with(value_range const*)
        ../../gcc-source-trunk/gcc/ipa-cp.c:891
0x136540f propagate_vr_accross_jump_function
        ../../gcc-source-trunk/gcc/ipa-cp.c:1905
0x136540f propagate_constants_accross_call
        ../../gcc-source-trunk/gcc/ipa-cp.c:2268
0x1366e28 propagate_constants_topo
        ../../gcc-source-trunk/gcc/ipa-cp.c:3162
0x1366e28 ipcp_propagate_stage
        ../../gcc-source-trunk/gcc/ipa-cp.c:3272
0x1369496 ipcp_driver
        ../../gcc-source-trunk/gcc/ipa-cp.c:5002
0x1369496 execute
        ../../gcc-source-trunk/gcc/ipa-cp.c:5096
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;

int fn1 (char e, char f)
{ 
  return !f || (e && f == 1);
}

void fn2 (char e)
{ 
  while (b)
    e = 0;
  a = 128;
  c = fn1 (e, a == e);
}

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