[Bug target/79242] ICE in simplify_subreg, at simplify-rtx.c:6029

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79242

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-04-18
                 CC|                            |marxin at gcc dot gnu.org
          Component|middle-end                  |target
     Ever confirmed|0                           |1

--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, there's reduced test-case for C:

typedef __int20 unsigned a;
int b, c (c > a (-1) / b);

./xgcc -B. tc.ii
tc.ii: In function ‘void __static_initialization_and_destruction_0(int, int)’:
tc.ii:2:13: internal compiler error: in simplify_subreg, at simplify-rtx.c:6034
 int b, c (c > a (-1) / b);
           ~~^~~~~~~~~~~~
0x105d288 simplify_subreg(machine_mode, rtx_def*, machine_mode, unsigned int)
        ../../gcc/simplify-rtx.c:6034
0x105dfd7 simplify_gen_subreg(machine_mode, rtx_def*, machine_mode, unsigned
int)
        ../../gcc/simplify-rtx.c:6265
0x105e07e lowpart_subreg(machine_mode, rtx_def*, machine_mode)
        ../../gcc/simplify-rtx.c:6288
0xc40370 gen_lowpart_common(machine_mode, rtx_def*)
        ../../gcc/emit-rtl.c:1456
0x103c314 gen_lowpart_general(machine_mode, rtx_def*)
        ../../gcc/rtlhooks.c:47
0xc7816d convert_move(rtx_def*, rtx_def*, int)
        ../../gcc/expr.c:530
0xc77f96 convert_move(rtx_def*, rtx_def*, int)
        ../../gcc/expr.c:508
0xc78ad5 convert_modes(machine_mode, machine_mode, rtx_def*, int)
        ../../gcc/expr.c:685
0xdf2639 expand_arith_overflow_result_store
        ../../gcc/internal-fn.c:568
0xdf68da expand_mul_overflow
        ../../gcc/internal-fn.c:1849
0xdf7f41 expand_arith_overflow
        ../../gcc/internal-fn.c:2149
0xdf8317 expand_MUL_OVERFLOW
        ../../gcc/internal-fn.c:2242
0xdfab1a expand_internal_call(internal_fn, gcall*)
        ../../gcc/internal-fn.c:2778
0xdfab45 expand_internal_call(gcall*)
        ../../gcc/internal-fn.c:2786
0xb42e0f expand_call_stmt
        ../../gcc/cfgexpand.c:2569
0xb42e0f expand_gimple_stmt_1
        ../../gcc/cfgexpand.c:3571
0xb42e0f expand_gimple_stmt
        ../../gcc/cfgexpand.c:3737
0xb4486e expand_gimple_basic_block
        ../../gcc/cfgexpand.c:5744
0xb4a4d6 execute
        ../../gcc/cfgexpand.c:6357