[Bug tree-optimization/71407] [7 Regression] ICE at -O3 in 32-bit and 64-bit modes on x86_64-linux-gnu (verify_gimple: integral result type precision does not match field size of BIT_FIELD_REF)

[helloqirun at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71407

Qirun Zhang <helloqirun at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |helloqirun at gmail dot com

--- Comment #4 from Qirun Zhang <helloqirun at gmail dot com> ---
A possible dup of this bug, with different crash info.

$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/home/absozero/trunk/root-gcc/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/home/absozero/trunk/root-gcc
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 7.0.0 20160608 (experimental) [trunk revision 237212] (GCC)


$ gcc-trunk -O3 abc.c
abc.c: In function ‘fn1’:
abc.c:3:6: internal compiler error: Segmentation fault
 void fn1() {
      ^~~
0xb635cf crash_signal
        ../../gcc/gcc/toplev.c:335
0xe5a184 top_bit_of
        ../../gcc/gcc/wide-int.cc:424
0xe5a184 wi::add_large(long*, long const*, unsigned int, long const*, unsigned
int, unsigned int, signop, bool*)
        ../../gcc/gcc/wide-int.cc:1143
0xdad921 wi::binary_traits<generic_wide_int<fixed_wide_int_storage<192> >, int,
wi::int_traits<generic_wide_int<fixed_wide_int_storage<192> >
>::precision_type, wi::int_traits<int>::precision_type>::result_type
wi::add<generic_wide_int<fixed_wide_int_storage<192> >,
int>(generic_wide_int<fixed_wide_int_storage<192> > const&, int const&)
        ../../gcc/gcc/wide-int.h:2330
0xdad921 wi::binary_traits<generic_wide_int<fixed_wide_int_storage<192> >, int,
(wi::precision_type)2, wi::int_traits<int>::precision_type>::result_type
generic_wide_int<fixed_wide_int_storage<192> >::operator+<int>(int const&)
const
        ../../gcc/gcc/wide-int.h:711
0xdad921 vect_transform_loop(_loop_vec_info*)
        ../../gcc/gcc/tree-vect-loop.c:6935
0xdc9bc5 vectorize_loops()
        ../../gcc/gcc/tree-vectorizer.c:554
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 abc.c
#define N 6
int a;
void fn1() {
  int k = 0;
  for (; k < N;)
    for (a = 0; a < N; k++)
      a = k + N;
}