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Last change
on this file was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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initial commit
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File size:
696 bytes
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| [6a3a178] | 1 | /*
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| 2 | * This is a AssemblyScript port of the original Java version, which was written by
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| 3 | * Gil Tene as described in
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| 4 | * https://github.com/HdrHistogram/HdrHistogram
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| 5 | * and released to the public domain, as explained at
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| 6 | * http://creativecommons.org/publicdomain/zero/1.0/
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| 7 | */
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| 8 |
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| 9 | export const bitCount = (n: u64): u8 => {
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| 10 | let bits: u8 = 0;
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| 11 | while (n !== 0) {
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| 12 | const input: u32 = <u32>(n & (<u64>u32.MAX_VALUE));
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| 13 | bits += bitCount32(input);
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| 14 | n /= 0x100000000;
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| 15 | }
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| 16 | return bits;
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| 17 | };
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| 18 |
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| 19 | function bitCount32(input: u32): u8 {
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| 20 | let n = input;
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| 21 | n = n - ((n >> 1) & 0x55555555);
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| 22 | n = (n & 0x33333333) + ((n >> 2) & 0x33333333);
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| 23 | return <u8>((((n + (n >> 4)) & 0xf0f0f0f) * 0x1010101) >> 24);
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| 24 | }
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