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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/96194] 10.1.1: ICE in assign_temp, at function.c:984
 during RTL pass: expand
Date: Tue, 14 Jul 2020 10:53:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96194

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2020-07-14

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Reduced testcase:

typedef decltype (sizeof 0) size_t;
void *operator new (size_t, void *b) { return b; }
struct A { ~A (); };
struct B : A { float e[64]; };

void *
foo (void *x, bool y)
{
  void *p =3D y ? x : nullptr;
  return new (p) B ();
}

(the nullptr is from:
static inline void *
os_malloc_aligned(size_t size, size_t alignment)
{
   void *ptr;
   alignment =3D (alignment + sizeof(void*) - 1) & ~(sizeof(void*) - 1);
   if(posix_memalign(&ptr, alignment, size) !=3D 0)
      return NULL;
   return ptr;
}
) and jump threading makes return new (nullptr) B (); out of this.

typedef decltype (sizeof 0) size_t;
void *operator new (size_t, void *b) { return b; }
struct A { ~A (); };
struct B : A { float e[64]; };

void *
foo ()
{
  return new (nullptr) B ();
}

ICEs too.=