[Bug c++/55355] internal compiler error: in tree_low_cst, at tree.c:6415

["mikpe at it dot uu.se" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

Mikael Pettersson <mikpe at it dot uu.se> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mikpe at it dot uu.se

--- Comment #12 from Mikael Pettersson <mikpe at it dot uu.se> 2012-11-22 23:25:45 UTC ---
It's a HWI32 bug.

The ICE reproduces on x86 with 4.6 branch if you build a 32-bit compiler that
targets 32-bit x86; passing -m32 to a 64-bit compiler won't trigger it.

The ICE was silenced on 32-bit x86 for 4.7 by r176871:
http://gcc.gnu.org/ml/gcc-cvs/2011-07/msg01139.html
which is when HJ made 32-bit x86 HWI64.

The ICE reproduces with current 4.7 and 4.8 in 32-bit compilers with HWI32
targets; for instance an i686 to m68k linux cross says:

pr55355.cc: In member function 'void C::funcC()':
pr55355.cc:34:1: internal compiler error: in tree_low_cst, at tree.c:6603
 }
 ^
0x856174f tree_low_cst(tree_node const*, int)
        /mnt/scratch/gcc-4.8-20121118/gcc/tree.c:6603
0x856179e int_bit_position(tree_node const*)
        /mnt/scratch/gcc-4.8-20121118/gcc/tree.c:2480
0x846af0b type_internals_preclude_sra_p
        /mnt/scratch/gcc-4.8-20121118/gcc/tree-sra.c:719
0x846af0b type_internals_preclude_sra_p
        /mnt/scratch/gcc-4.8-20121118/gcc/tree-sra.c:678
0x8471e1f find_param_candidates
        /mnt/scratch/gcc-4.8-20121118/gcc/tree-sra.c:3627
0x8471e1f ipa_early_sra
        /mnt/scratch/gcc-4.8-20121118/gcc/tree-sra.c:4928
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