[Bug target/93637] New: [9/10 Regression] ICE: Segmentation fault (in force_operand)

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93637

            Bug ID: 93637
           Summary: [9/10 Regression] ICE: Segmentation fault (in
                    force_operand)
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---
            Target: x86_64-unknown-linux-gnu

gcc-10.0.1-alpha20200202 snapshot (g:b817be038d94c987e02c26ed2d81b6f2ebb5f97a)
and gcc 9.2.0 ICE when compiling the following testcase, reduced from
gcc/testsuite/gcc.dg/vect/pr65947-10.c, w/ -mavx -O3 --param
sccvn-max-alias-queries-per-access=3:

double
zl (void)
{
  int cf;
  double yp;
  double ev[] = {
    0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 1.0, 1.0,
  };

  for (cf = 0; cf < sizeof (ev) / sizeof (ev[0]); ++cf)
    if (ev[cf] == 0.0)
      yp = ev[cf];

  return yp;
}

% x86_64-unknown-linux-gnu-gcc-10.0.1 -mavx -O3 --param
sccvn-max-alias-queries-per-access=3 -c wyezqdy3.c
during RTL pass: expand
wyezqdy3.c: In function 'zl':
wyezqdy3.c:2:1: internal compiler error: Segmentation fault
    2 | zl (void)
      | ^~
0xd88c6f crash_signal
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200202/work/gcc-10-20200202/gcc/toplev.c:328
0xa1d8f2 force_operand(rtx_def*, rtx_def*)
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200202/work/gcc-10-20200202/gcc/expr.c:7502
0x8f3fde expand_gimple_stmt_1
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200202/work/gcc-10-20200202/gcc/cfgexpand.c:3811
0x8f3fde expand_gimple_stmt
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200202/work/gcc-10-20200202/gcc/cfgexpand.c:3847
0x8f85aa expand_gimple_basic_block
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200202/work/gcc-10-20200202/gcc/cfgexpand.c:5887
0x8fa6de execute
       
/var/tmp/portage/sys-devel/gcc-10.0.1_alpha20200202/work/gcc-10-20200202/gcc/cfgexpand.c:6542