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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/99309] [10/11 Regression] Segmentation fault with
 __builtin_constant_p usage at -O2
Date: Mon, 01 Mar 2021 09:44:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99309

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hubicka at gcc dot gnu.org,
                   |                            |jakub at gcc dot gnu.org

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Testcase without headers:

struct T {
  int val;
  explicit constexpr operator int() const { return val; }
  constexpr T(long v):val(v){}
  void operator*=3D(T m) {
    if(__builtin_constant_p(m.val)){
      __builtin_printf ("normal\n");
      return;
    }else if(__builtin_constant_p(val)){
      __builtin_printf ("recursive\n");
      return;
    }else{
      __builtin_printf ("return\n");
      return;
    }
  }
};


int main(){
  T constexpr step=3D610334368;
  T value=3D1;
  for(int _=3D0; _<100; ++_){
    __builtin_printf ("%d %d\n", (int) value, (int) step);
    value*=3Dstep;
    __builtin_printf ("%d %d\n", (int) value, (int) step);
  }
}

Bet yet another IPA/inlining bug, like e.g. PR98834, the __builtin_unreacha=
ble
call is added during inlining:
Introduced new external node (void __builtin_unreachable()/11).=