> But the current code converts (and X 3) into a bit extraction > since ((i = exact_log2 (UINTVAL (XEXP (x, 1)) + 1)) >= 0) is true > when UINTVAL (XEXP (x, 1)) == 3. Should we do it or not?
By adding the test for nonzero bits, you'd potentially be doing the conversion more often (which is the point of this patch, after all) and it's therefore necessary to be sure you're not doing it *too* often.
