[Bug tree-optimization/71206] New: ICE on valid code at all optimization levels in both 32-bit and 64-bit modes on x86_64-linux-gnu. (verify_gimple failed)

["chengniansun at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71206

            Bug ID: 71206
           Summary: ICE on valid code at all optimization levels in both
                    32-bit and 64-bit modes on x86_64-linux-gnu.
                    (verify_gimple failed)
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: chengniansun at gmail dot com
  Target Milestone: ---

The following code crashes the trunk at all optimization levels in both 32-bit
and 64-bit modes on x86_64-linux-gnu. 


$: 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 20160519 (experimental) [trunk revision 236439] (GCC)
$:
$: gcc-trunk -O0 small.c
small.c: In function âfn1â:
small.c:4:6: error: type mismatch in binary expression
 void fn1() { fn1(b ^ (2 || c) ^ ((a || 3) ^ d)); }
      ^~~
unsigned int

unsigned int

int

_3 = b.0_1 ^ d.1_2;
small.c:4:6: internal compiler error: verify_gimple failed
0xbdf79d verify_gimple_in_seq(gimple*)
        ../../gcc-source-trunk/gcc/tree-cfg.c:4833
0x950c71 gimplify_body(tree_node*, bool)
        ../../gcc-source-trunk/gcc/gimplify.c:11548
0x9510a6 gimplify_function_tree(tree_node*)
        ../../gcc-source-trunk/gcc/gimplify.c:11636
0x7b62f7 cgraph_node::analyze()
        ../../gcc-source-trunk/gcc/cgraphunit.c:625
0x7b951b analyze_functions
        ../../gcc-source-trunk/gcc/cgraphunit.c:1086
0x7ba09c symbol_table::finalize_compilation_unit()
        ../../gcc-source-trunk/gcc/cgraphunit.c:2543
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.
$:
$: cat small.c
char a;
unsigned b;
int c, d;
void fn1() { fn1(b ^ (2 || c) ^ ((a || 3) ^ d)); }

int main() {}