[Bug target/70052] New: ICE compiling _Decimal128 test case

[bergner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70052

            Bug ID: 70052
           Summary: ICE compiling _Decimal128 test case
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bergner at gcc dot gnu.org
  Target Milestone: ---

We ICE with the following test case.

bergner@genoa:~/gcc/BUGS/DFP/arith128-P8AT9/src$ cat ice.i 
typedef struct
{
  _Decimal128 td0;
  _Decimal128 td1;
} TDx2_t;


TDx2_t
D256_add_finite (void)
{
  _Decimal128 z, zz;
  TDx2_t result = {0.DL, 0.DL};

  if (zz == 0.DL)
  {
    result.td0 = z;
    return result;
  }

  return result;
}

bergner@genoa:~/gcc/BUGS/DFP/$
/home/bergner/gcc/build/gcc-fsf-mainline-base-debug/gcc/xgcc
-B/home/bergner/gcc/build/gcc-fsf-mainline-base-debug/gcc -O2 -mcpu=power8 -S
ice.i 
ice.i: In function ‘D256_add_finite’:
ice.i:21:1: error: unrecognizable insn:
 }
 ^
(insn 110 19 111 3 (set (reg:DD 33 1)
        (const_double:DD 0E-398 [N/A])) ice.i:17 -1
     (nil))
ice.i:21:1: internal compiler error: in extract_insn, at recog.c:2287
0x10c0b3d7 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /home/bergner/gcc/gcc-fsf-mainline-base/gcc/rtl-error.c:108
0x10c0b44f _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /home/bergner/gcc/gcc-fsf-mainline-base/gcc/rtl-error.c:116
0x10b8f313 extract_insn(rtx_insn*)
        /home/bergner/gcc/gcc-fsf-mainline-base/gcc/recog.c:2287
0x10b8eddf extract_insn_cached(rtx_insn*)
        /home/bergner/gcc/gcc-fsf-mainline-base/gcc/recog.c:2178
0x10712067 cleanup_subreg_operands(rtx_insn*)
        /home/bergner/gcc/gcc-fsf-mainline-base/gcc/final.c:3104
0x10b916b7 split_insn
        /home/bergner/gcc/gcc-fsf-mainline-base/gcc/recog.c:2901
0x10b918a7 split_all_insns()
        /home/bergner/gcc/gcc-fsf-mainline-base/gcc/recog.c:2955
0x10b94973 rest_of_handle_split_after_reload
        /home/bergner/gcc/gcc-fsf-mainline-base/gcc/recog.c:3891
0x10b94a33 execute
        /home/bergner/gcc/gcc-fsf-mainline-base/gcc/recog.c:3920
Please submit a full bug report,