diff options
Diffstat (limited to 'npc/functions/bitwise.txt')
| -rw-r--r-- | npc/functions/bitwise.txt | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/npc/functions/bitwise.txt b/npc/functions/bitwise.txt index 8cb6a426..a2e57587 100644 --- a/npc/functions/bitwise.txt +++ b/npc/functions/bitwise.txt @@ -44,3 +44,23 @@ function script bitwise_set { return set(getarg(0), (getarg(0) & ~(getarg(1))) | (getarg(3, 0) << getarg(2, 0))); } + + +// bitmask_count(<int>) +// returns the number of bits set in <int> (up to 4096?) +function script bitmask_count { + .@n = getarg(0); // Number evaluated + .@p=0; // Bits set/unset + .@s=0; // Stack and Check + .@m=0; // Memory + + // Loop only as needed + while (.@s < .@n) { + .@s=2**.@m; + if (.@n & .@s) + .@p++; + .@m++; + } + return .@p; +} + |