[Bug c/70302] New: crash on valid code at -O2 and -O3 in 32-bit mode on x86_64-linux-gnu (in convert_op, at config/i386/i386.c:3414)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70302

            Bug ID: 70302
           Summary: crash on valid code at -O2 and -O3 in 32-bit mode on
                    x86_64-linux-gnu (in convert_op, at
                    config/i386/i386.c:3414)
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: chengniansun at gmail dot com
  Target Milestone: ---

The following code crashes the trunk at -O2 and -O3 in 32-bit mode (not 64-bit)
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/6.0.0/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 6.0.0 20160318 (experimental) [trunk revision 234330] (GCC) 
$: 
$: gcc-trunk -c -w -m32 -O2 small.c
small.c: In function âfn1â:
small.c:14:1: internal compiler error: in convert_op, at
config/i386/i386.c:3414
 }
 ^
0xe815c0 scalar_chain::convert_op(rtx_def**, rtx_insn*)
        ../../gcc-source-trunk/gcc/config/i386/i386.c:3414
0xe817ae scalar_chain::convert_insn(rtx_insn*)
        ../../gcc-source-trunk/gcc/config/i386/i386.c:3445
0xea3c92 scalar_chain::convert()
        ../../gcc-source-trunk/gcc/config/i386/i386.c:3521
0xea44d5 convert_scalars_to_vector
        ../../gcc-source-trunk/gcc/config/i386/i386.c:3582
0xea44d5 execute
        ../../gcc-source-trunk/gcc/config/i386/i386.c:3674
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 -c -w -m32 -O1 small.c
$: 
$: cat small.c
long a, c, e;
int b, d;
unsigned long long f;
void fn1(long long p1) {
  unsigned long long g;
  int i;
  for (; i;)
    if (e)
      g = c;
  if (a)
    f = p1;
  if (!f && !g)
    printf("", b, d, d);
}
$: