[Bug c/79733] New: ICE in int_mode_for_mode, at stor-layout.c:406

["gerhard dot steinmetz dot fortran at t-online dot de" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79733

            Bug ID: 79733
           Summary: ICE in int_mode_for_mode, at stor-layout.c:406
           Product: gcc
           Version: 7.0.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gerhard.steinmetz.fortran@t-online.de
  Target Milestone: ---

With testfile ./gcc.target/i386/avx512f-kortestw-2.c,
down to version 4.9, at -Os|1|2|3 and with one of
   -mavx512f
   -mavx512pf
   -mavx512er
   -mavx512cd
   -mavx512vl
   -mavx512bw
   -mavx512dq
   -mavx512ifma
   -mavx512vbmi


$ gcc-7-20170226 -O2 -mavx512f -c avx512f-kortestw-1.c
In file included from
.../gcc/x86_64-pc-linux-gnu/7.0.1/include/immintrin.h:45:0,
                 from avx512f-kortestw-1.c:5:
.../gcc/x86_64-pc-linux-gnu/7.0.1/include/avx512fintrin.h: In function
'avx512f_test':
.../gcc/x86_64-pc-linux-gnu/7.0.1/include/avx512fintrin.h:10095:10: internal
compiler error: in int_mode_for_mode, at stor-layout.c:406
   return (__mmask16) __builtin_ia32_kortestchi ((__mmask16) __A,
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
       (__mmask16) __B);
       ~~~~~~~~~~~~~~~~
0xbe8a9f int_mode_for_mode(machine_mode)
        ../../gcc/stor-layout.c:406
0x8bccae emit_move_via_integer
        ../../gcc/expr.c:3289
0x8c9a7a emit_move_insn_1(rtx_def*, rtx_def*)
        ../../gcc/expr.c:3670
0x8c9dd4 emit_move_insn(rtx_def*, rtx_def*)
        ../../gcc/expr.c:3738
0x8ad0f2 copy_to_reg(rtx_def*)
        ../../gcc/explow.c:585
0xf6d4d1 ix86_expand_builtin
        ../../gcc/config/i386/i386.c:37800
0x793606 expand_builtin(tree_node*, rtx_def*, rtx_def*, machine_mode, int)
        ../../gcc/builtins.c:6362
0x8c5a14 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
        ../../gcc/expr.c:10810
0x8d1be6 store_expr_with_bounds(tree_node*, rtx_def*, int, bool, bool,
tree_node*)
        ../../gcc/expr.c:5552
0x8d37d0 expand_assignment(tree_node*, tree_node*, bool)
        ../../gcc/expr.c:5321
0x7b7cfa expand_call_stmt
        ../../gcc/cfgexpand.c:2656
0x7b7cfa expand_gimple_stmt_1
        ../../gcc/cfgexpand.c:3571
0x7b7cfa expand_gimple_stmt
        ../../gcc/cfgexpand.c:3737
0x7b998e expand_gimple_basic_block
        ../../gcc/cfgexpand.c:5744
0x7bfa56 execute
        ../../gcc/cfgexpand.c:6357