[Bug target/100106] New: [10/11 Regression] ICE in gen_movdi, at config/arm/arm.md:6187 since r10-2840-g70cdb21e

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100106

            Bug ID: 100106
           Summary: [10/11 Regression] ICE in gen_movdi, at
                    config/arm/arm.md:6187 since r10-2840-g70cdb21e
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: acoplan at gcc dot gnu.org
  Target Milestone: ---

The following fails:

$ cat test.c
union a {
  float _Complex b;
  long long c;
};

void g(union a);

void e() {
  union a f = {1.0f};
  g(f);
}
$ gcc/xgcc -B gcc test.c -c -O
during RTL pass: expand
test.c: In function ‘e’:
test.c:9:11: internal compiler error: in gen_movdi, at config/arm/arm.md:6187
    9 |   union a f = {1.0f};
      |           ^
0x1de9e64 gen_movdi(rtx_def*, rtx_def*)
        /home/alecop01/toolchain/src/gcc/gcc/config/arm/arm.md:6187
0xdb9086 rtx_insn* insn_gen_fn::operator()<rtx_def*, rtx_def*>(rtx_def*,
rtx_def*) const
        /home/alecop01/toolchain/src/gcc/gcc/recog.h:407
0xd8ff58 emit_move_insn_1(rtx_def*, rtx_def*)
        /home/alecop01/toolchain/src/gcc/gcc/expr.c:3766
0xd909ca emit_move_insn(rtx_def*, rtx_def*)
        /home/alecop01/toolchain/src/gcc/gcc/expr.c:3936
0xd69cbb store_bit_field_1
        /home/alecop01/toolchain/src/gcc/gcc/expmed.c:804
0xd6b8bb store_bit_field(rtx_def*, poly_int<1u, unsigned long>, poly_int<1u,
unsigned long>, poly_int<1u, unsigned long>, poly_int<1u, unsigned long>,
machine_mode, rtx_def*, bool)
        /home/alecop01/toolchain/src/gcc/gcc/expmed.c:1183
0xd9eaef store_field
        /home/alecop01/toolchain/src/gcc/gcc/expr.c:7353
0xd95ddf expand_assignment(tree_node*, tree_node*, bool)
        /home/alecop01/toolchain/src/gcc/gcc/expr.c:5482
0xbf2c4e expand_gimple_stmt_1
        /home/alecop01/toolchain/src/gcc/gcc/cfgexpand.c:3910
0xbf303d expand_gimple_stmt
        /home/alecop01/toolchain/src/gcc/gcc/cfgexpand.c:4008
0xbfbaa3 expand_gimple_basic_block
        /home/alecop01/toolchain/src/gcc/gcc/cfgexpand.c:6045
0xbfd954 execute
        /home/alecop01/toolchain/src/gcc/gcc/cfgexpand.c:6729
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

Started with r10-2840-g70cdb21e579191fe9f0f1d45e328908e59c0179e.