diff options
| -rw-r--r-- | capset.go | 5 |
1 files changed, 5 insertions, 0 deletions
@@ -144,11 +144,16 @@ func (d *Deck) hasSetWithLast(tableau []Card) bool { } i := len(tableau) - 1 for j := 0; j < i; j++ { + // Both same and diff are trying to get 11 for each attribute to indicate a + // match. same := ^(tableau[i].attrs ^ tableau[j].attrs) diff := tableau[i].attrs ^ tableau[j].attrs for k := j + 1; k < i; k++ { + // same and diff become fully computed. 11 indicates match. sameFinal := same & ^(tableau[i].attrs ^ tableau[k].attrs) diffFinal := diff ^ tableau[k].attrs + // Shift and AND so that we have a single bit to indicate success. This is + // necessary for the OR to function appropriately. sameSingle := sameFinal & (sameFinal >> 1) diffSingle := diffFinal & (diffFinal >> 1) if (sameSingle|diffSingle)&d.isSetBitMask == d.isSetBitMask { |