[Bug rtl-optimization/98082] New: [11 Regression] ICE in set_rtl, at cfgexpand.c:178 since r11-3257-g225a08220e444371

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98082

            Bug ID: 98082
           Summary: [11 Regression] ICE in set_rtl, at cfgexpand.c:178
                    since r11-3257-g225a08220e444371
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: ebotcazou at gcc dot gnu.org
  Target Milestone: ---

The following fails:

$ cat x.cpp
class GoodIter {
public:
  GoodIter();
  GoodIter(GoodIter &);
};
GoodIter operator-(int, GoodIter) { return GoodIter(); }
GoodIter operator+(int, GoodIter) { return GoodIter(); }

$ g++ -fipa-icf x.cpp -c -std=c++20
during RTL pass: expand
x.cpp: In function ‘GoodIter operator+(int, GoodIter)’:
x.cpp:7:10: internal compiler error: in set_rtl, at cfgexpand.c:178
    7 | GoodIter operator+(int, GoodIter) { return GoodIter(); }
      |          ^~~~~~~~
0x71000d set_rtl
        /home/marxin/Programming/gcc/gcc/cfgexpand.c:178
0xbc613e set_parm_rtl(tree_node*, rtx_def*)
        /home/marxin/Programming/gcc/gcc/cfgexpand.c:1400
0xd51671 assign_parms
        /home/marxin/Programming/gcc/gcc/function.c:3760
0xd53ec7 expand_function_start(tree_node*)
        /home/marxin/Programming/gcc/gcc/function.c:5135
0xbd3f5b execute
        /home/marxin/Programming/gcc/gcc/cfgexpand.c:6612
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