Weird output with __builtin_popcount()

#1

for the number = 1 099 511 627 776 ,output of __builtin_popcount should be 1, but it is 0 here

binary of 1 099 511 627 776 =
0b10000000000000000000000000000000000000000

using n&n-1 works fine, for this number.

Why such unexpected output?

#2

hello @arvinder
buitin popcount works for interger datatype only.
the input ur are giving is greater than the range of int thats why it is giving this weird output.

#3

Thanks, later i used __builtin_popcountll(), it worked well