[Bug target/71698] ICE related to decimal float when compiling with -mcpu=power9

["bergner at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71698

Peter Bergner <bergner at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2016-6-29
                 CC|                            |bergner at gcc dot gnu.org

--- Comment #4 from Peter Bergner <bergner at gcc dot gnu.org> ---
Confirmed.  Here's a minimal test case:

bergner@genoa:~/gcc/BUGS/sawdey$ cat t.i
_Decimal128 g01d128;
extern void testvad128 (int n, ...);

void
testitd128 (void)
{
  testvad128 (1, g01d128);
}
bergner@genoa:~/gcc/BUGS/sawdey$
/home/bergner/gcc/build/gcc-fsf-mainline-vec-dform-2/gcc/xgcc
-B/home/bergner/gcc/build/gcc-fsf-mainline-vec-dform-2/gcc -mcpu=power9 -O1 -S
t.i 
t.i: In function âtestitd128â:
t.i:8:1: error: insn does not satisfy its constraints:
 }
 ^
(insn 17 6 10 2 (set (reg:TD 4 4)
        (reg:TD 34 2 [orig:157 g01d128 ] [157])) t.i:7 456 {*movtd_64bit_nodm}
     (nil))
t.i:8:1: internal compiler error: in extract_constrain_insn, at recog.c:2211
0x10803ba3 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /home/bergner/gcc/gcc-fsf-mainline-vec-dform-2/gcc/rtl-error.c:108
0x10803bfb _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /home/bergner/gcc/gcc-fsf-mainline-vec-dform-2/gcc/rtl-error.c:119
0x107ca397 extract_constrain_insn(rtx_insn*)
        /home/bergner/gcc/gcc-fsf-mainline-vec-dform-2/gcc/recog.c:2211
0x1079ada3 reload_cse_simplify_operands
        /home/bergner/gcc/gcc-fsf-mainline-vec-dform-2/gcc/postreload.c:390
0x1079e02f reload_cse_simplify
        /home/bergner/gcc/gcc-fsf-mainline-vec-dform-2/gcc/postreload.c:176
0x1079e02f reload_cse_regs_1
        /home/bergner/gcc/gcc-fsf-mainline-vec-dform-2/gcc/postreload.c:215
0x1079e1d7 reload_cse_regs
        /home/bergner/gcc/gcc-fsf-mainline-vec-dform-2/gcc/postreload.c:67
0x1079e1d7 execute
        /home/bergner/gcc/gcc-fsf-mainline-vec-dform-2/gcc/postreload.c:2342
Please submit a full bug report,

It seems related to the vararg argument, since if I change that to a normal
_Decimal128 type, it compiles fine.