[Bug target/64200] New: ICE: in decide_alg, at config/i386/i386.c:24510 with -mmemcpy-strategy=libcall:-1:align -minline-stringops-dynamically

["zsojka at seznam dot cz" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64200

            Bug ID: 64200
           Summary: ICE: in decide_alg, at config/i386/i386.c:24510 with
                    -mmemcpy-strategy=libcall:-1:align
                    -minline-stringops-dynamically
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz

Created attachment 34202
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34202&action=edit
reduced testcase

Compiler output:
$ gcc -mmemcpy-strategy=libcall:-1:align -minline-stringops-dynamically
testcase.c testcase.c: In function 'foo':
testcase.c:14:5: internal compiler error: in decide_alg, at
config/i386/i386.c:24510
   d = __builtin_va_arg(ap, typeof (d));
     ^
0xf110d2 decide_alg
        /mnt/svn/gcc-trunk/gcc/config/i386/i386.c:24510
0xf59cff ix86_expand_set_or_movmem(rtx_def*, rtx_def*, rtx_def*, rtx_def*,
rtx_def*, rtx_def*, rtx_def*, rtx_def*, rtx_def*, rtx_def*, bool)
        /mnt/svn/gcc-trunk/gcc/config/i386/i386.c:24763
0x106cefe gen_movmemdi(rtx_def*, rtx_def*, rtx_def*, rtx_def*, rtx_def*,
rtx_def*, rtx_def*, rtx_def*, rtx_def*)
        /mnt/svn/gcc-trunk/gcc/config/i386/i386.md:15893
0xb19eb2 insn_gen_fn::operator()(rtx_def*, rtx_def*, rtx_def*, rtx_def*,
rtx_def*, rtx_def*, rtx_def*, rtx_def*, rtx_def*) const
        /mnt/svn/gcc-trunk/gcc/recog.h:310
0xb19eb2 maybe_gen_insn(insn_code, unsigned int, expand_operand*)
        /mnt/svn/gcc-trunk/gcc/optabs.c:8395
0xb1a4c8 maybe_expand_insn(insn_code, unsigned int, expand_operand*)
        /mnt/svn/gcc-trunk/gcc/optabs.c:8407
0x8d8b9e emit_block_move_via_movmem
        /mnt/svn/gcc-trunk/gcc/expr.c:1330
0x8d8b9e emit_block_move_hints(rtx_def*, rtx_def*, rtx_def*, block_op_methods,
unsigned int, long, unsigned long, unsigned long, unsigned long)
        /mnt/svn/gcc-trunk/gcc/expr.c:1148
0x7974d1 expand_builtin_memcpy_args
        /mnt/svn/gcc-trunk/gcc/builtins.c:3241
0x7a6f1c expand_builtin(tree_node*, rtx_def*, rtx_def*, machine_mode, int)
        /mnt/svn/gcc-trunk/gcc/builtins.c:6286
0x8d4716 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
        /mnt/svn/gcc-trunk/gcc/expr.c:10471
0x7caf89 expand_expr
        /mnt/svn/gcc-trunk/gcc/expr.h:299
0x7caf89 expand_call_stmt
        /mnt/svn/gcc-trunk/gcc/cfgexpand.c:2347
0x7cb6bf expand_gimple_stmt_1
        /mnt/svn/gcc-trunk/gcc/cfgexpand.c:3293
0x7cb6bf expand_gimple_stmt
        /mnt/svn/gcc-trunk/gcc/cfgexpand.c:3447
0x7d0c53 expand_gimple_basic_block
        /mnt/svn/gcc-trunk/gcc/cfgexpand.c:5280
0x7d3146 execute
        /mnt/svn/gcc-trunk/gcc/cfgexpand.c:5889
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested revisions:
r218413 - ICE (after PR64108 fix)
4_9 r218177 - ICE