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Fix compile time set cardinality (#7558)

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This commit is contained in:
Oscar Nihlgård 2018-04-10 10:38:16 +02:00 • committed by Andreas Rumpf
commit 427490a845
3 changed files with 34 additions and 11 deletions
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25
compiler/bitsets.nim
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@ -28,6 +28,7 @@ proc bitSetExcl*(x: var TBitSet, elem: BiggestInt)
proc bitSetIn*(x: TBitSet, e: BiggestInt): bool
proc bitSetEquals*(x, y: TBitSet): bool
proc bitSetContains*(x, y: TBitSet): bool
proc bitSetCard*(x: TBitSet): BiggestInt
# implementation
proc bitSetIn(x: TBitSet, e: BiggestInt): bool =
@ -69,3 +70,27 @@ proc bitSetContains(x, y: TBitSet): bool =
if (x[i] and not y[i]) != int8(0):
return false
result = true
# Number of set bits for all values of int8
const populationCount: array[low(int8)..high(int8), int8] = [
1.int8, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8,
0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7
]
proc bitSetCard(x: TBitSet): BiggestInt =
for it in x:
result.inc populationCount[it]