[Bug rtl-optimization/84659] New: [8 Regression] ICE: Segmentation fault (stack overflow in bb_note) w/ selective scheduling

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84659

            Bug ID: 84659
           Summary: [8 Regression] ICE: Segmentation fault (stack overflow
                    in bb_note) w/ selective scheduling
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---
            Target: powerpc-*-linux-gnu, powerpcspe-*-linux-gnu

gcc-8.0.0-alpha20180225 snapshot (r257975) ICEs when compiling the following
snippet w/ -O2 -fselective-scheduling -fsel-sched-pipelining
-fno-split-wide-types -fno-strict-aliasing -fno-tree-dce:

void
jk (int **lq, int *k4, long long int qv, int od)
{
  while (**lq < 1)
    {
      int uo;

      uo = ((od == 0) ? qv : *k4) != 1;
      ++**lq;
    }

  for (;;)
    {
    }
}

% powerpc-e300c3-linux-gnu-gcc-8.0.0-alpha20180225 -O2 -fselective-scheduling
-fsel-sched-pipelining -fno-split-wide-types -fno-strict-aliasing -fno-tree-dce
-c l87hqbdd.c
powerpc-e300c3-linux-gnu-gcc-8.0.0-alpha20180225: internal compiler error:
Segmentation fault signal terminated program cc1

==12735== Stack overflow in thread #1: can't grow stack to 0x1ffe801000
==12735== Stack overflow in thread #1: can't grow stack to 0x1ffe801000
==12735== Can't extend stack to 0x1ffe801098 during signal delivery for thread
1:
==12735==   no stack segment
==12735== 
==12735== Process terminating with default action of signal 11 (SIGSEGV)
==12735==  Access not within mapped region at address 0x1FFE801098
==12735== Stack overflow in thread #1: can't grow stack to 0x1ffe801000
==12735==    at 0x749EC7: bb_note(basic_block_def*) (cfgrtl.c:667)
==12735==  If you believe this happened as a result of a stack
==12735==  overflow in your program's main thread (unlikely but
==12735==  possible), you can try to increase the size of the
==12735==  main thread stack using the --main-stacksize= flag.
==12735==  The main thread stack size used in this run was 67108864.
==12735== Stack overflow in thread #1: can't grow stack to 0x1ffe801000
==12735== 
==12735== Process terminating with default action of signal 11 (SIGSEGV)
==12735==  Access not within mapped region at address 0x1FFE801F58
==12735== Stack overflow in thread #1: can't grow stack to 0x1ffe801000
==12735==    at 0x4026660: _vgnU_freeres (in
/usr/lib64/valgrind/vgpreload_core-amd64-linux.so)
==12735==  If you believe this happened as a result of a stack
==12735==  overflow in your program's main thread (unlikely but
==12735==  possible), you can try to increase the size of the
==12735==  main thread stack using the --main-stacksize= flag.
==12735==  The main thread stack size used in this run was 67108864.