[Bug tree-optimization/119707] wrong code with _BitInt() mask and shift at -O1

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119707

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2025-04-10

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
-O2 -fno-inline is miscompiled too, or
unsigned _BitInt(256) g;

__attribute__((noipa)) unsigned long
foo (_BitInt(129) k)
{
  unsigned _BitInt(255) a = -1;
  unsigned _BitInt(256) m = g - (k & a);
  unsigned __int128 e = m >> 128;
  unsigned long long r = e >> 64;
  return r;
}

int
main ()
{
  unsigned long long x = foo (-1);
  if (x != 0x8000000000000000ULL)
    __builtin_abort ();
}
at any opt level other than -O0.