[Bug rtl-optimization/68269] New: [5/6 regression] FAIL: gcc.dg/pr68129_1.c (internal compiler error)

[schwab@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68269

            Bug ID: 68269
           Summary: [5/6 regression] FAIL: gcc.dg/pr68129_1.c (internal
                    compiler error)
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: schwab@linux-m68k.org
  Target Milestone: ---
            Target: ia64-*-*

Both -O and -fno-split-wide-types are required to trigger the ICE.

$ gcc/xgcc -Bgcc/ ../gcc/testsuite/gcc.dg/pr68129_1.c -O -fno-split-wide-types
-S -o pr68129_1.s
../gcc/testsuite/gcc.dg/pr68129_1.c: In function ‘foo’:
../gcc/testsuite/gcc.dg/pr68129_1.c:10:1: internal compiler error: in
simplify_const_binary_operation, at simplify-rtx.c:3950
 }
 ^

0x4000000000c3a8bf simplify_const_binary_operation(rtx_code, machine_mode,
rtx_def*, rtx_def*)
        ../../gcc/simplify-rtx.c:3950
0x4000000000c3a54f simplify_binary_operation(rtx_code, machine_mode, rtx_def*,
rtx_def*)
        ../../gcc/simplify-rtx.c:1990
0x4000000000c4376f simplify_gen_binary(rtx_code, machine_mode, rtx_def*,
rtx_def*)
        ../../gcc/simplify-rtx.c:194
0x40000000014fc92f expand_field_assignment
        ../../gcc/combine.c:7234
0x40000000014ffc3f can_combine_p
        ../../gcc/combine.c:1910
0x400000000152e55f try_combine
        ../../gcc/combine.c:2961
0x400000000153c06f combine_instructions
        ../../gcc/combine.c:1267
0x400000000153c06f rest_of_handle_combine
        ../../gcc/combine.c:14278
0x400000000153c06f execute
        ../../gcc/combine.c:14321