[Bug rtl-optimization/69030] New: ICE on x86_64-linux-gnu at -O2 and above in 32-bit mode (ICE in copy_rtx, at rtl.c:358)

[chengniansun at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69030

            Bug ID: 69030
           Summary: ICE on x86_64-linux-gnu at -O2 and above in 32-bit
                    mode (ICE in copy_rtx, at rtl.c:358)
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: chengniansun at gmail dot com
  Target Milestone: ---

The following code crashes gcc-trunk at -O2 and -O3 on x86_64-linux-gnu in
32-bit mode (not in 64-bit mode)

$: 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/6.0.0/lto-wrapper
Target: x86_64-pc-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 6.0.0 20151222 (experimental) [trunk revision 231896] (GCC) 
$: 
$: gcc-trunk -m32 small.c -w -g -O3
small.c: In function ‘main’:
small.c:25:1: internal compiler error: in copy_rtx, at rtl.c:358
 }
 ^

0xa87c13 copy_rtx(rtx_def*)
        ../../gcc-trunk/gcc/rtl.c:358
0x99e7d4 remove_pseudos
        ../../gcc-trunk/gcc/lra-spills.c:426
0x99e77f remove_pseudos
        ../../gcc-trunk/gcc/lra-spills.c:435
0x99e77f remove_pseudos
        ../../gcc-trunk/gcc/lra-spills.c:435
0x99f0b3 spill_pseudos
        ../../gcc-trunk/gcc/lra-spills.c:474
0x99f0b3 lra_spill()
        ../../gcc-trunk/gcc/lra-spills.c:586
0x9800ed lra(_IO_FILE*)
        ../../gcc-trunk/gcc/lra.c:2367
0x936f99 do_reload
        ../../gcc-trunk/gcc/ira.c:5385
0x936f99 execute
        ../../gcc-trunk/gcc/ira.c:5556
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.
$: 
$: gcc-trunk -m32 small.c -w -g -O2
small.c: In function ‘main’:
small.c:25:1: internal compiler error: Segmentation fault
 }
 ^

0xaed4af crash_signal
        ../../gcc-trunk/gcc/toplev.c:334
0x995f83 lra_eliminate_regs_1(rtx_insn*, rtx_def*, machine_mode, bool, bool,
long, bool)
        ../../gcc-trunk/gcc/lra-eliminations.c:664
0x99e812 remove_pseudos
        ../../gcc-trunk/gcc/lra-spills.c:425
0x99e77f remove_pseudos
        ../../gcc-trunk/gcc/lra-spills.c:435
0x99e77f remove_pseudos
        ../../gcc-trunk/gcc/lra-spills.c:435
0x99f0b3 spill_pseudos
        ../../gcc-trunk/gcc/lra-spills.c:474
0x99f0b3 lra_spill()
        ../../gcc-trunk/gcc/lra-spills.c:586
0x9800ed lra(_IO_FILE*)
        ../../gcc-trunk/gcc/lra.c:2367
0x936f99 do_reload
        ../../gcc-trunk/gcc/ira.c:5385
0x936f99 execute
        ../../gcc-trunk/gcc/ira.c:5556
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
int a, b, c = 7, d;
static unsigned e, g;
char f;
static unsigned fn1() {
  unsigned h = e - b ^ c;
  int i = h / c & a * g, j = g * h;
  if (h) {
    if (d)
      h = e;
    j = a;
    a = (a && (g % f && i) % h) | c | ~2;
    if (b)
      printf("", 1);
  }
  c = i;
  a = j;
  return 2;
}

int main() {
  for (; b < -18; --b)
    g = 0;
  fn1();
  return 0;
}
$: