https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123364
Bug ID: 123364
Summary: ICE: in emit_swap_insn, at reg-stack.cc with fsincos
inline asm
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: ---
It is only reproducible with the optimization flag.
Reproducer: https://godbolt.org/z/616nbohMq
```c
__attribute__((noipa)) void bug(float b) {
float a;
__asm__ volatile("fsincos" : "+t"(b), "=u"(a) : "0"(b));
__asm__ volatile("fsca" ::: "st");
}
```
Traceback:
```
internal compiler error: in emit_swap_insn, at reg-stack.cc:850
23 | }
| ^
0x5da1dc8 internal_error(char const*, ...)
/workspace/install/gcc/src/gcc/gcc/diagnostic-global-context.cc:517
0x5d3f858 fancy_abort(char const*, int, char const*)
/workspace/install/gcc/src/gcc/gcc/diagnostic.cc:1749
0x2582c2d emit_swap_insn
/workspace/install/gcc/src/gcc/gcc/reg-stack.cc:850
0x25844ee move_for_stack_reg
/workspace/install/gcc/src/gcc/gcc/reg-stack.cc:1145
0x2586bba subst_stack_regs_pat
/workspace/install/gcc/src/gcc/gcc/reg-stack.cc:1620
0x258b8eb subst_stack_regs
/workspace/install/gcc/src/gcc/gcc/reg-stack.cc:2505
0x258e073 convert_regs_1
/workspace/install/gcc/src/gcc/gcc/reg-stack.cc:3141
0x258e827 convert_regs_2
/workspace/install/gcc/src/gcc/gcc/reg-stack.cc:3277
0x258e95c convert_regs
/workspace/install/gcc/src/gcc/gcc/reg-stack.cc:3313
0x258f37b reg_to_stack
/workspace/install/gcc/src/gcc/gcc/reg-stack.cc:3441
0x258f4db rest_of_handle_stack_regs
/workspace/install/gcc/src/gcc/gcc/reg-stack.cc:3497
0x258f5b0 execute
/workspace/install/gcc/src/gcc/gcc/reg-stack.cc:3529
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.
```
