[Bug tree-optimization/64563] New: ICE with "-Wall -Wextra" at -Os and above on x86_64-linux-gnu

["su at cs dot ucdavis.edu" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64563

            Bug ID: 64563
           Summary: ICE with "-Wall -Wextra" at -Os and above on
                    x86_64-linux-gnu
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu

The following code causes an ICE when compiled using the current gcc trunk with
"-Wall -Wextra" at -Os and above on x86_64-linux-gnu in both 32-bit and 64-bit
modes. 

It is a regression from 4.9.x.

$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-unknown-linux-gnu/5.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-trunk/configure --prefix=/usr/local/gcc-trunk
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 5.0.0 20150111 (experimental) [trunk revision 219429] (GCC) 

$ 
$ gcc-trunk -Os -c small.c
$ gcc-4.9 -Wall -Wextra -Os -c small.c
small.c: In function âfn1â:
small.c:7:14: warning: comparison between signed and unsigned integer
expressions [-Wsign-compare]
   d = b = (a != (e | 4294967288UL));
              ^
$ 
$ gcc-trunk -Wall -Wextra -Os -c small.c
small.c: In function âfn1â:
small.c:7:14: warning: comparison between signed and unsigned integer
expressions [-Wsign-compare]
   d = b = (a != (e | 4294967288UL));
              ^
small.c:5:1: internal compiler error: Segmentation fault
 fn1 ()
 ^
0xa9896f crash_signal
    ../../gcc-trunk/gcc/toplev.c:372
0xce9a44 contains_struct_check(tree_node const*, tree_node_structure_enum, char
const*, int, char const*)
    ../../gcc-trunk/gcc/tree.h:3128
0xce9a44 vrp_val_is_min
    ../../gcc-trunk/gcc/tree-vrp.c:241
0xcf0094 vrp_evaluate_conditional
    ../../gcc-trunk/gcc/tree-vrp.c:7550
0xd06454 fold_predicate_in
    ../../gcc-trunk/gcc/tree-vrp.c:9958
0xd06454 vrp_fold_stmt
    ../../gcc-trunk/gcc/tree-vrp.c:10001
0xc2c3d3 substitute_and_fold_dom_walker::before_dom_children(basic_block_def*)
    ../../gcc-trunk/gcc/tree-ssa-propagate.c:1148
0x10ad7e7 dom_walker::walk(basic_block_def*)
    ../../gcc-trunk/gcc/domwalk.c:188
0xc2bcf0 substitute_and_fold(tree_node* (*)(tree_node*), bool
(*)(gimple_stmt_iterator*), bool)
    ../../gcc-trunk/gcc/tree-ssa-propagate.c:1236
0xd033f4 vrp_finalize
    ../../gcc-trunk/gcc/tree-vrp.c:10189
0xd033f4 execute_vrp
    ../../gcc-trunk/gcc/tree-vrp.c:10305
0xd033f4 execute
    ../../gcc-trunk/gcc/tree-vrp.c:10384
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, f;
unsigned int e;

void
fn1 ()
{
  d = b = (a != (e | 4294967288UL));
  if (!d)
    c = f || b;
}