https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123365
Bug ID: 123365
Summary: ICE: in emit_move_insn, at expr.cc with inline asm
array-to-register constraint
Product: gcc
Version: 15.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: 522024330006 at smail dot nju.edu.cn
Target Milestone: ---
Reproducer: https://godbolt.org/z/cjPncTK7a
The crash occurs during the RTL Expansion phase. The compiler is attempting to
satisfy a register constraint ("r") for a Compound Literal Array (long
long[]){0}, which leads to the conflict between the required register mode and
the actual memory mode.
```c
int main() {
__asm__ volatile ("" : "+r"((long long[]){0}) : "r"((long long[]){0}));
}
```
Traceback:
```
internal compiler error: in emit_move_insn, at expr.cc:4636
15 | __asm__ volatile ("" : "+r"((long long[]){0}) : "r"((long
long[]){0})); // Induce REG_EQUAL note with mismatched mode
| ^~~~~~~
0x569ce3c internal_error(char const*, ...)
/workspace/install/gcc/src/gcc/gcc/diagnostic-global-context.cc:517
0x563a4de fancy_abort(char const*, int, char const*)
/workspace/install/gcc/src/gcc/gcc/diagnostic.cc:1749
0x15929bb emit_move_insn(rtx_def*, rtx_def*)
/workspace/install/gcc/src/gcc/gcc/expr.cc:4636
0x1542988 force_reg(machine_mode, rtx_def*)
/workspace/install/gcc/src/gcc/gcc/explow.cc:693
0x1290a93 expand_asm_stmt
/workspace/install/gcc/src/gcc/gcc/cfgexpand.cc:3733
0x1293b16 expand_gimple_stmt_1
/workspace/install/gcc/src/gcc/gcc/cfgexpand.cc:4215
0x1294734 expand_gimple_stmt
/workspace/install/gcc/src/gcc/gcc/cfgexpand.cc:4365
0x12a3b0e expand_gimple_basic_block
/workspace/install/gcc/src/gcc/gcc/cfgexpand.cc:6483
0x12a8415 execute
/workspace/install/gcc/src/gcc/gcc/cfgexpand.cc:7232
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
```
