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From: "dimitar.yordanov at sap dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/104880] New: regression ICE in
 expand_expr_addr_expr_1, at expr.c:8231
Date: Fri, 11 Mar 2022 11:31:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104880

            Bug ID: 104880
           Summary: regression ICE in expand_expr_addr_expr_1, at
                    expr.c:8231
           Product: gcc
           Version: 11.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dimitar.yordanov at sap dot com
  Target Milestone: ---

Hi,

I hit an ICE with the following reduced example:

cat > foo.cc << EOF

class c {
  long b;
};
class B {
public:
  typedef void *d;
};
class aa {
public:
  aa(B::d, char *);
};
class e : public B {
public:
  e();
};
__uint128_t f;
struct g {
  struct h : c {
    h(__uint128_t &i) : c(reinterpret_cast<c &>(i)) {}
    __uint128_t ad();
  };
};
class n : g {
public:
  n(int);
  void j() {
    __uint128_t a;
    h k(a);
    __atomic_compare_exchange_n(&f, &a, k.ad(), true, 3, 0);
  }
};
int l;
class m : e {
  void ar() {
    n b(l);
    b.j();
  }
  virtual c bd() { aa(d(&m::ar), ""); }
};
void o() { new m; }

EOF

g++ -mcx16 -O2 -c foo.cc

during RTL pass: expand
foo.cc: In member function =E2=80=98void m::ar()=E2=80=99:
foo.cc:29:32: internal compiler error: in expand_expr_addr_expr_1, at
expr.c:8231
   29 |     __atomic_compare_exchange_n(&f, &a, k.ad(), true, 3, 0);

Regression appeared first with:

https://gcc.gnu.org/git/?p=3Dgcc.git;a=3Dcommit;h=3Deb72dc663e9070b281be83a=
80f6f838a3a878822

Best regards
Dimitar=