[Bug middle-end/55943] New: ICE in gen_reg_rtx

["schwab@linux-m68k.org" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55943

             Bug #: 55943
           Summary: ICE in gen_reg_rtx
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: schwab@linux-m68k.org
            Target: ia64-*-*


Created attachment 29150
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29150
Testcase

$ gcc-20130111/Build/gcc/xgcc -B gcc-20130111/Build/gcc/ -S
gcc/gcc/testsuite/gcc.c-torture/compile/pr55921.c 
gcc/gcc/testsuite/gcc.c-torture/compile/pr55921.c: In function ‘foo’:
gcc/gcc/testsuite/gcc.c-torture/compile/pr55921.c:21:1: internal compiler
error: in gen_reg_rtx, at emit-rtl.c:866
 }
 ^
0x400000000040012f gen_reg_rtx(machine_mode)
        ../../gcc/emit-rtl.c:866
0x4000000000432f1f store_bit_field_1
        ../../gcc/expmed.c:776
0x4000000000433b9f store_bit_field(rtx_def*, unsigned long, unsigned long,
unsigned long, unsigned long, machine_mode, rtx_def*)
        ../../gcc/expmed.c:897
0x400000000045f40f write_complex_part
        ../../gcc/expr.c:2960
0x400000000045f6bf emit_move_complex_parts(rtx_def*, rtx_def*)
        ../../gcc/expr.c:3216
0x4000000000718dff gen_move_insn(rtx_def*, rtx_def*)
        ../../gcc/optabs.c:4783
0x40000000007f752f gen_reload
        ../../gcc/reload1.c:8705
0x40000000008077af emit_input_reload_insns
        ../../gcc/reload1.c:7591
0x40000000008077af do_input_reload
        ../../gcc/reload1.c:7877
0x40000000008077af emit_reload_insns
        ../../gcc/reload1.c:8069
0x40000000008077af reload_as_needed
        ../../gcc/reload1.c:4645
0x4000000000811f2f reload(rtx_def*, int)
        ../../gcc/reload1.c:1051
0x4000000000604caf do_reload
        ../../gcc/ira.c:4635
0x4000000000604caf rest_of_handle_reload
        ../../gcc/ira.c:4736

Note that this is the original version of pr55921.c with the matching
constraints.