[Bug tree-optimization/97386] [8/9/10/11 Regression] wrong code with __builtin_bswap16() of rotated 64bit value

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97386

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |8.5
             Status|UNCONFIRMED                 |ASSIGNED
                 CC|                            |jakub at gcc dot gnu.org
   Last reconfirmed|                            |2020-10-12
     Ever confirmed|0                           |1
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gnu.org

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with my r8-3824-ga0e4174cd80f8a17026d6c13af2802dc8a0146ad
unsigned int c;

unsigned char
foo (void)
{
  return __builtin_bswap16 ((unsigned long long) (0xccccLLU << c | 0xccccLLU >>
((-c) & 63)));
}

int
main (void)
{
  unsigned char x = foo ();
  if (__CHAR_BIT__ == 8 && x != 0xcc)
    __builtin_abort ();
  return 0;
}