[Bug middle-end/43740] [4.5/4.6 Regression] FAIL: gcc.dg/tree-ssa/20031015-1.c (internal compiler error)

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

------- Comment #13 from danglin at gcc dot gnu dot org  2010-06-16 01:27 -------
The flag for reg:DI 2349 is copied from:

Breakpoint 7, set_reg_attrs_from_value (reg=0x800003fffd4c0420, 
    x=0x800003fffd976c40) at ../../gcc/gcc/emit-rtl.c:975
975       if (HARD_REGISTER_P (reg))
(gdb) p debug_rtx (reg)                                  
(reg:DI 2349)
$69 = void
(gdb) p debug_rtx (x)  
(reg/f:DI 356 [ D.35290 ])

The flag in reg/f:DI 356 is set here:

Breakpoint 6, mark_reg_pointer (reg=0x800003fffd976c40, align=64)
    at ../../gcc/gcc/emit-rtl.c:1118
1118      if (! REG_POINTER (reg))
(gdb) p debug_rtx (reg)                             
(reg:DI 356 [ D.35290 ])
$71 = void
(gdb) bt
#0  mark_reg_pointer (reg=0x800003fffd976c40, align=64)
    at ../../gcc/gcc/emit-rtl.c:1118
#1  0x4000000000dd6c54 in expand_one_register_var (var=0x800003fffdff1790)
    at ../../gcc/gcc/cfgexpand.c:847
#2  0x4000000000dd7574 in expand_one_var (var=0x800003fffd976c40, 
    toplevel=0 '\0', really_expand=128 '\200')
    at ../../gcc/gcc/cfgexpand.c:978
#3  0x4000000000dd8ecc in expand_used_vars ()
    at ../../gcc/gcc/cfgexpand.c:1310
#4  0x4000000000de6118 in gimple_expand_cfg ()
    at ../../gcc/gcc/cfgexpand.c:3779
#5  0x4000000001b86534 in execute_one_pass (pass=0x800003fffdff1790)
    at ../../gcc/gcc/passes.c:1568

(gdb) p debug_tree (var)
 <VEC(rtx,gc) 800003fffdff1790
    type <var_decl 800003fffcf8ce60 D.35290
        type <pointer_type 800003fffdd8ad20 tree type <union_type
800003fffdd8abd0 tree_node>
            sizes-gimplified asm_written public unsigned DI
            size <integer_cst 800003fffdec7758 constant 64>
            unit size <integer_cst 800003fffdec7780 constant 8>
            align 64 symtab -2147482625 alias set -1 canonical type
800003fffdd8ac78
            pointer_to_this <pointer_type 800003fffde01888>>
        used unsigned ignored DI file ../../gcc/gcc/gimple-pretty-print.c line
1498 col 1 size <integer_cst 800003fffdec7758 64> unit size <integer_cst
800003fffdec7780 8>
        align 64 context <function_decl 800003fffd691600 dump_gimple_stmt>
abstract_origin <result_decl 800003fffd1b8a00 D.21084>
        (reg:DI 356 [ D.35290 ])>
    asm_written used nothrow public private protected static deprecated visited
tree_0 tree_1 tree_2 tree_3 tree_4 tree_6>


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43740