[Bug target/83507] New: [8 Regression] ICE in internal_dfa_insn_code_* for powerpc targets

["asolokha at gmx dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83507

            Bug ID: 83507
           Summary: [8 Regression] ICE in internal_dfa_insn_code_* for
                    powerpc targets
           Product: gcc
           Version: 8.0
            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: powerpc-*-linux-gnu, powerpcspe-*-linux-gnu

gcc-8.0.0-alpha20171217 snapshot (r255766) ICEs when compiling the following
snippet for powerpc targets w/ -mcpu=power7 (476, 476fp, 604, 604e, 620, 630,
cell, power3, power8, powerpc, powerpc64le) -O2 -fmodulo-sched -fno-tree-ter
-fno-tree-coalesce-vars:

void
r2 (unsigned short int qe, unsigned char ng)
{
  unsigned char *k5 = &ng;
  unsigned short int w4;
  int a8;

  while (ng < 3)
    {
      if (qe != 0)
        ++ng;
      ++ng;
    }

  for (a8 = 0; a8 < 5; ++a8)
    {
      int l3;

      l3 = 1;
      l3 += w4 > qe;
      ng &= l3;
    }

  do
    {
      a8 += ng;
      qe = a8;
    }
  while (qe != 0);
}

% powerpc-e300c3-linux-gnu-gcc-8.0.0-alpha20171217 -O2 -fmodulo-sched
-fno-tree-ter -fno-tree-coalesce-vars -c r9ldrjtv.c
r9ldrjtv.c: In function 'r2':
r9ldrjtv.c:30:1: error: unrecognizable insn:
 }
 ^
(insn 78 0 0 (set (reg:SI 149)
        (reg:SI 76 ca)) -1
     (nil))
during RTL pass: sms
r9ldrjtv.c:30:1: internal compiler error: in internal_dfa_insn_code_power7, at
config/rs6000/rs6000.md:7837
0x5484ba _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171217/work/gcc-8-20171217/gcc/rtl-error.c:108
0x5484fa _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171217/work/gcc-8-20171217/gcc/rtl-error.c:116
0x11cb121 internal_dfa_insn_code_power7(rtx_insn*)
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171217/work/gcc-8-20171217/gcc/config/rs6000/rs6000.md:7837
0x11b60d3 dfa_insn_code
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171217/work/build/gcc/insn-automata.c:123145
0x11b60d3 insn_latency(rtx_insn*, rtx_insn*)
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171217/work/build/gcc/insn-automata.c:124510
0x1459e9d schedule_reg_move
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171217/work/gcc-8-20171217/gcc/modulo-sched.c:589
0x1459e9d schedule_reg_moves
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171217/work/gcc-8-20171217/gcc/modulo-sched.c:797
0x145bbf0 sms_schedule
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171217/work/gcc-8-20171217/gcc/modulo-sched.c:1678
0x145d382 execute
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-8.0.0_alpha20171217/work/gcc-8-20171217/gcc/modulo-sched.c:3342