[Bug tree-optimization/83269] [8 Regression] Wrong constant folding

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83269

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

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

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
With -O2 this started to FAIL in between r124153 and r124228 and FAILs up to
current trunk.
With -O1, it reappeared with r247495.

Slightly adjusted:

int
main ()
{
#if __SIZEOF_INT__ == 4 && __SIZEOF_LONG_LONG__ > 4 && __CHAR_BIT__ == 8
  volatile unsigned char a = 1;
  long long b = 0x80000000L;
  int c = -((int)(-b) - (-0x7fffffff * a));
  if (c != 1)
    __builtin_abort ();
#endif
  return 0;
}