[Bug target/112336] New: ICE in gen_reg_rtx emit-rtl.cc:1208 while compiling "unsigned _BitInt(1) Foo;" with -fsanitize=address

["fkastl at suse dot cz" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112336

            Bug ID: 112336
           Summary: ICE in gen_reg_rtx emit-rtl.cc:1208 while compiling
                    "unsigned _BitInt(1) Foo;" with -fsanitize=address
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: fkastl at suse dot cz
  Target Milestone: ---
              Host: x86_64-linux
            Target: x86_64-linux

Compiling a file with a single line (a reduced ext-int.c from llvm testsuite):

--- ice.c ---
unsigned _BitInt(1) GlobSize1;
---

with -fsanitize=address:

gcc -fsanitize=address ice.c

results in an ICE:

ice.c:1:1: internal compiler error: in gen_reg_rtx, at emit-rtl.cc:1208
    1 | unsigned _BitInt(1) GlobSize1;
      | ^~~~~~~~
0x77249b gen_reg_rtx(machine_mode)
        ../../src/gcc/emit-rtl.cc:1208
0xe94b89 maybe_legitimize_operand
        ../../src/gcc/optabs.cc:8044
0xe94b89 maybe_legitimize_operands(insn_code, unsigned int, unsigned int,
expand_operand*)
        ../../src/gcc/optabs.cc:8199
0xe90ee9 maybe_gen_insn(insn_code, unsigned int, expand_operand*)
        ../../src/gcc/optabs.cc:8218
0xe99c0c expand_binop_directly
        ../../src/gcc/optabs.cc:1457
0xe97b29 expand_binop(machine_mode, optab_tag, rtx_def*, rtx_def*, rtx_def*,
int, optab_methods)
        ../../src/gcc/optabs.cc:1544
0xbde1c0 expand_and(machine_mode, rtx_def*, rtx_def*, rtx_def*)
        ../../src/gcc/expmed.cc:5483
0xbf8544 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
        ../../src/gcc/expr.cc:11005
0xc01fce expand_expr(tree_node*, rtx_def*, machine_mode, expand_modifier)
        ../../src/gcc/expr.h:310
0xc01fce expand_expr_addr_expr_1
        ../../src/gcc/expr.cc:8728
0xc02639 expand_expr_addr_expr
        ../../src/gcc/expr.cc:8849
0xbf7894 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
        ../../src/gcc/expr.cc:12163
0x1370de3 expand_expr(tree_node*, rtx_def*, machine_mode, expand_modifier)
        ../../src/gcc/expr.h:310
0x1370de3 output_constant
        ../../src/gcc/varasm.cc:5261
0x136fee8 output_constructor_regular_field
        ../../src/gcc/varasm.cc:5612
0x136fee8 output_constructor
        ../../src/gcc/varasm.cc:5878
0x136fee8 output_constructor_regular_field
        ../../src/gcc/varasm.cc:5612
0x136fee8 output_constructor
        ../../src/gcc/varasm.cc:5878
0x1371df5 assemble_variable_contents
        ../../src/gcc/varasm.cc:2231
0x1376f8d assemble_variable(tree_node*, int, int, int)
        ../../src/gcc/varasm.cc:2410