[Bug target/84437] New: long long casting breaks PDP-11 with -m10 model option (includes trivial reproducer)

[etchedpixels at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84437

            Bug ID: 84437
           Summary: long long casting breaks PDP-11 with -m10 model option
                    (includes trivial reproducer)
           Product: gcc
           Version: 7.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: etchedpixels at gmail dot com
  Target Milestone: ---

long long x(int y)
{
    return y;
}


pdp11-aout-gcc -m10 -S /tmp/3.c
/tmp/3.c: In function ‘x’:
/tmp/3.c:4:1: error: unrecognizable insn:
 }
 ^
(insn 7 6 8 2 (set (reg:HI 24)
        (ashift:HI (reg:HI 23)
            (const_int -15 [0xfffffffffffffff1]))) "/tmp/3.c":3 -1
     (nil))
/tmp/3.c:4:1: internal compiler error: in extract_insn, at recog.c:2311
0x8d8b48 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        ../../gcc-7.3.0/gcc/rtl-error.c:108
0x8d8b79 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        ../../gcc-7.3.0/gcc/rtl-error.c:116
0x8ae40f extract_insn(rtx_insn*)
        ../../gcc-7.3.0/gcc/recog.c:2311
0x6fe3f3 instantiate_virtual_regs_in_insn
        ../../gcc-7.3.0/gcc/function.c:1589
0x6fe3f3 instantiate_virtual_regs
        ../../gcc-7.3.0/gcc/function.c:1957
0x6fe3f3 execute
        ../../gcc-7.3.0/gcc/function.c:2006