[Bug c++/60474] New: [regression] Crash in tree_class_check

[jacek at codeweavers dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60474

            Bug ID: 60474
           Summary: [regression] Crash in tree_class_check
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jacek at codeweavers dot com

Created attachment 32317
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32317&action=edit
test case

Compiling Mozilla sources with current GCC trunk causes ICE. I'm attaching a
simplified test case. I tested on i686-w64-mingw32 target, but it's unlikely to
matter. The crash happens with -O1 optimization level (and no other that I
tried).

$ i686-w64-mingw32-g++ test.i -c -O1
test.i: In function 'void FillBackgroundList(nsAutoTArray<Layer>&,
ComputedValueItem Layer::*, uint32_t) [with ComputedValueItem = unsigned char;
uint32_t = unsigned int]':
test.i:26:1: internal compiler error: Segmentation fault
 FillBackgroundList(nsAutoTArray< Layer> &aLayers,
 ^
0xb48fcf crash_signal
        ../../../gcc-git/gcc/toplev.c:337
0x1061e40 tree_class_check
        ../../../gcc-git/gcc/tree.h:2831
0x1061e40 double_int_ext_for_comb(double_int, aff_tree*)
        ../../../gcc-git/gcc/tree-affine.c:44
0x10624a6 aff_combination_scale(aff_tree*, double_int)
        ../../../gcc-git/gcc/tree-affine.c:86
0xc658a6 difference_cost
        ../../../gcc-git/gcc/tree-ssa-loop-ivopts.c:3896
0xc6a4ba get_computation_cost_at
        ../../../gcc-git/gcc/tree-ssa-loop-ivopts.c:4176
0xc6ce8c get_computation_cost
        ../../../gcc-git/gcc/tree-ssa-loop-ivopts.c:4290
0xc6ce8c determine_use_iv_cost_generic
        ../../../gcc-git/gcc/tree-ssa-loop-ivopts.c:4317
0xc6ce8c determine_use_iv_cost
        ../../../gcc-git/gcc/tree-ssa-loop-ivopts.c:4911
0xc6f090 determine_use_iv_costs
        ../../../gcc-git/gcc/tree-ssa-loop-ivopts.c:5031
0xc6f090 tree_ssa_iv_optimize_loop
        ../../../gcc-git/gcc/tree-ssa-loop-ivopts.c:6849
0xc6f9b3 tree_ssa_iv_optimize()
        ../../../gcc-git/gcc/tree-ssa-loop-ivopts.c:6895
0xc816a7 tree_ssa_loop_ivopts
        ../../../gcc-git/gcc/tree-ssa-loop.c:362
0xc816a7 execute
        ../../../gcc-git/gcc/tree-ssa-loop.c:398