[Bug tree-optimization/118206] [15 regression] libdeflate miscompiled by ifcombine since r15-6360-g6d5df5133c5dd8

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118206

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

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

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Simplified testcase:
__attribute__((noipa)) int
foo (const void *x)
{
  unsigned short b;
  __builtin_memcpy (&b, x, sizeof (short));
  b = __builtin_bswap16 (b);
  if ((b % 31) != 0)
    return 1;
  if (((b >> 8) & 15) != 8)
    return 1;
  if ((b >> 12) > 7)
    return 1;
  return 0;
}

int
main ()
{
  unsigned char a[8] = { 0x78, 0x9c };
  if (sizeof (short) == 2 && foo (a) != 0)
    __builtin_abort ();
}