[Bug rtl-optimization/63259] Detecting byteswap sequence

[sch...@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63259

--- Comment #8 from Andreas Schwab <sch...@linux-m68k.org> ---
(a & 0xFF00) >> 8 with short a = 0x8001 evaluates to 0x80, since all operands
are first promoted to int.