https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115921
--- Comment #1 from Siarhei Volkau <lis8215 at gmail dot com> ---
Also take in account examples like this:
uint32_t high_const_and_compare(uint32_t x)
{
if ( (x & 0x70000000) == 0x30000000)
return do_some();
return do_other();
}
It might be profitable to use right shift first there to lower constants.
Now, even if you do manual optimization, GCC throws it away.
