[Bug rtl-optimization/61629] New: [4.10 regression] FAIL: gcc.dg/20020312-2.c (internal compiler error)

["schwab at linux-m68k dot org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61629

            Bug ID: 61629
           Summary: [4.10 regression] FAIL: gcc.dg/20020312-2.c (internal
                    compiler error)
           Product: gcc
           Version: 4.10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: schwab@linux-m68k.org
                CC: hubicka at gcc dot gnu.org
            Target: m68k-*-*

Broken by r212007.

(gdb) r -O ../../gcc/testsuite/gcc.dg/20020312-2.c

Program received signal SIGSEGV, Segmentation fault.
true_regnum (x=x@entry=0x0) at ../../gcc/jump.c:1893
(gdb) bt
#0  true_regnum (x=x@entry=0x0) at ../../gcc/jump.c:1893
#1  0x0000000000c0000b in m68k_secondary_reload_class (
    rclass=rclass@entry=ALL_REGS, mode=mode@entry=VOIDmode, x=x@entry=0x0)
    at ../../gcc/config/m68k/m68k.c:5197
#2  0x000000000095a79e in default_secondary_reload (in_p=<optimized out>,
    x=0x0, reload_class_i=7, reload_mode=VOIDmode, sri=0x7fffffffd880)
    at ../../gcc/targhooks.c:908
#3  0x00000000008eb57a in secondary_reload_class (in_p=in_p@entry=false,
    rclass=rclass@entry=7, mode=mode@entry=VOIDmode, x=<optimized out>)
    at ../../gcc/reload.c:526
#4  0x00000000008e3322 in memory_move_secondary_cost (mode=VOIDmode,
    rclass=7, in=false) at ../../gcc/reginfo.c:581
#5  0x000000000095b28c in default_memory_move_cost (mode=<optimized out>,
    rclass=<optimized out>, in=<optimized out>) at ../../gcc/targhooks.c:1357
#6  0x000000000080951d in setup_class_subset_and_memory_move_costs ()
    at ../../gcc/ira.c:584
#7  ira_init () at ../../gcc/ira.c:1711
#8  0x00000000008e3295 in reinit_regs () at ../../gcc/reginfo.c:536
#9  0x00000000008e396d in globalize_reg (decl=decl@entry=
    <var_decl 0x7ffff6b02360 reg>, i=i@entry=13) at ../../gcc/reginfo.c:806
#10 0x0000000000be5790 in make_decl_rtl (
    decl=decl@entry=<var_decl 0x7ffff6b02360 reg>) at ../../gcc/varasm.c:1354
#11 0x00000000008b293b in rest_of_decl_compilation (
    decl=decl@entry=<var_decl 0x7ffff6b02360 reg>,
    top_level=top_level@entry=1, at_end=at_end@entry=0)
    at ../../gcc/passes.c:215
#12 0x00000000004e617a in finish_decl (
    decl=decl@entry=<var_decl 0x7ffff6b02360 reg>, init_loc=init_loc@entry=0,
    init=<optimized out>, init@entry=<tree 0x0>,
    origtype=origtype@entry=<tree 0x0>, asmspec_tree=<optimized out>,
    asmspec_tree@entry=<string_cst 0x7ffff6b05b10>)
    at ../../gcc/c/c-decl.c:4535
#13 0x0000000000543c43 in c_parser_declaration_or_fndef (
    parser=parser@entry=0x7ffff6b13000, fndef_ok=false, fndef_ok@entry=true,
    static_assert_ok=static_assert_ok@entry=true,
    empty_ok=empty_ok@entry=true, nested=nested@entry=false,
    start_attr_ok=start_attr_ok@entry=true,
    objc_foreach_object_declaration=objc_foreach_object_declaration@entry=0x0,
omp_declare_simd_clauses=..., omp_declare_simd_clauses@entry=...)
    at ../../gcc/c/c-parser.c:1824
#14 0x0000000000548a46 in c_parser_external_declaration (
    parser=0x7ffff6b13000) at ../../gcc/c/c-parser.c:1400
#15 0x00000000005494fa in c_parser_translation_unit (parser=0x7ffff6b13000)
    at ../../gcc/c/c-parser.c:1287
#16 c_parse_file () at ../../gcc/c/c-parser.c:14092
#17 0x000000000059e463 in c_common_parse_file ()
    at ../../gcc/c-family/c-opts.c:1115
#18 0x000000000095d268 in compile_file () at ../../gcc/toplev.c:548
#19 0x000000000095f431 in do_compile () at ../../gcc/toplev.c:1946
#20 toplev_main (argc=3, argv=0x7fffffffdd98) at ../../gcc/toplev.c:2022
#21 0x00007ffff6c38be5 in __libc_start_main (main=
    0x4d7d70 <main(int, char**)>, argc=3, argv=0x7fffffffdd98,
    init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>,
    stack_end=0x7fffffffdd88) at libc-start.c:269
#22 0x00000000004d7de1 in _start () at ../sysdeps/x86_64/start.S:122
(gdb) f 4
#4  0x00000000008e3322 in memory_move_secondary_cost (mode=VOIDmode,
    rclass=7, in=false) at ../../gcc/reginfo.c:581
(gdb) p default_target_rtl.x_top_of_stack[mode]
$1 = (nil)