On 10/20/2016 07:05 AM, Richard Henderson wrote: > On 10/19/2016 08:01 PM, Marek Vasut wrote: >>> > You might like 0xfffffffc better, but that does require that you count >>> > f's appropriately for the type. That's why I like -4: it's obvious >>> (or >>> > should be) that it masks to a multiple of 4, and type promotion >>> extends >>> > bits to the left as needed for the type of the other AND argument. >> But then you can also use ~3 , right ? > > Yes. > >> In which case, you'd avoid doing >> bitwise operations with negative numbers, which is nice. > > Eh. Since ~3 == -4, ~3 is a negative number. So it's a false argument. > > (C triviallities aside, such as the fact that there are no negative > constants, only positive constants to which unary negation may be applied.) > > The reason I like -4 is that it aligns to 4, spelled the same way.
OK -- Best regards, Marek Vasut
