[Bug ipa/64068] [5 Regression] ICE: in remove_unreachable_nodes, at ipa.c:546

[dimhen at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64068

--- Comment #2 from Dmitry G. Dyachenko <dimhen at gmail dot com> ---
another testcase

$ /usr/local/gcc_current/bin/g++ -fpreprocessed -c -O2 x.ii
x.ii:46:19: internal compiler error: in remove_unreachable_nodes, at ipa.c:546
 void fn4() { B(); }
                   ^
0xb14713 symbol_table::remove_unreachable_nodes(bool, _IO_FILE*)
    /home/dimhen/src/gcc_current/gcc/ipa.c:546
0x189e60c ipa_inline
    /home/dimhen/src/gcc_current/gcc/ipa-inline.c:2193
0x189e60c execute
    /home/dimhen/src/gcc_current/gcc/ipa-inline.c:2558
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.

$ cat x.ii
typedef int PROV_ENUMALGS_EX, PCCRYPT_OID_INFO;
class A {
  int m_fn2();
  virtual bool m_fn1(PCCRYPT_OID_INFO);
};
int fn1();
void fn2();
int A::m_fn2() { m_fn1(0); }

bool fn3() {
  for (;;) {
    if (fn1()) {
      if (fn1() != 259)
        fn2();
      break;
    }
    return 1;
  }
  return 0;
}

class B {
public:
  B() { fn3(); }
};
class C : A {
  bool m_fn1(PCCRYPT_OID_INFO) { m_fn3(); }
  int isSupportedByProvider_algId;
  PROV_ENUMALGS_EX isSupportedByProvider_outEnumAlgs;
  PROV_ENUMALGS_EX isSupportedByProvider_enumAlgs;
  bool m_fn3() {
    while (1) {
      if (fn1()) {
        if (fn1() != 259)
          fn2();
        break;
      }
      if (isSupportedByProvider_algId)
        isSupportedByProvider_outEnumAlgs = isSupportedByProvider_enumAlgs;
      return 1;
    }
    return 0;
  }
};

void fn4() { B(); }