[Bug middle-end/84300] New: ICE in dwarf2cfi on ppc64le with -fsplit-stack -fno-omit-frame-pointer

[ian at airs dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84300

            Bug ID: 84300
           Summary: ICE in dwarf2cfi on ppc64le with -fsplit-stack
                    -fno-omit-frame-pointer
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ian at airs dot com
  Target Milestone: ---

With a cross-compiler from x86_64-pc-linux-gnu to powerpc64le-unknown-linux-gnu
compiling this file with -g -O2 -fsplit-stack -fno-omit-frame-pointer crashes.

void trap () { __builtin_trap (); }

during RTL pass: dwarf2
/usr/local/google/home/iant/foo.c: In function 'trap':
/usr/local/google/home/iant/foo.c:1:1: internal compiler error: in
maybe_record_trace_start, at dwarf2cfi.c:2348
 void trap () { __builtin_trap (); }
 ^~~~
0x791f8d maybe_record_trace_start
        /tmp/go-build-release/gccgo-srcdir/gcc/dwarf2cfi.c:2348
0x792524 scan_trace
        /tmp/go-build-release/gccgo-srcdir/gcc/dwarf2cfi.c:2541
0x7934a7 create_cfi_notes
        /tmp/go-build-release/gccgo-srcdir/gcc/dwarf2cfi.c:2689
0x7934a7 execute_dwarf2_frame
        /tmp/go-build-release/gccgo-srcdir/gcc/dwarf2cfi.c:3057
0x7934a7 execute
        /tmp/go-build-release/gccgo-srcdir/gcc/dwarf2cfi.c:3545
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://go.ext.google.com/go/> for instructions.


The 312r.dwarf2 file shows:

;; Function runtime.Breakpoint (runtime.Breakpoint, funcdef_no=1318,
decl_uid=22
712, cgraph_uid=829, symbol_order=13584)

Creating trace 0 : start at note 1
Creating trace 1 : start at code_label 25
Creating trace 2 : start at code_label 39
Creating trace 3 : start at note 29
Processing trace 0 : start at note 1
   saw edge from trace 0 to 2 (via jump_insn 18)
        push trace 2 to worklist
   saw edge from trace 0 to 1 (via fallthru 0)
        push trace 1 to worklist
Processing trace 1 : start at code_label 25
Processing trace 2 : start at code_label 39
   saw edge from trace 2 to 3 (via fallthru 0)
        push trace 3 to worklist
Processing trace 3 : start at note 29
   saw edge from trace 3 to 1 (via jump_insn 40)
Inconsistent CFI state!
SHOULD have:
        .cfi_def_cfa 1, 0
DO have:
        .cfi_def_cfa 1, 0
        .cfi_offset 65, 16