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Optimize LiteralAndZeroFillExpander.resetLiteral() [don't merge] #11

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Optimize LiteralAndZeroFillExpander.resetLiteral() [don't merge] #11

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6a99277
Optimize LiteralAndZeroFillExpander.resetLiteral()
leventov Nov 28, 2016
54d0e90
Clearer bit operations
leventov Dec 9, 2016
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15 changes: 10 additions & 5 deletions src/main/java/it/uniroma3/mat/extendedset/intset/ConciseSetUtils.java
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Original file line number Diff line number Diff line change
Expand Up @@ -447,12 +447,17 @@ private void resetZeroSequence(int offset, int word, boolean fromBeginning)

private void resetLiteral(int offset, int word, boolean fromBeginning)
{
len = 0;
for (int i = 0; i < MAX_LITERAL_LENGTH; i++) {
if ((word & (1 << i)) != 0) {
buffer[len++] = offset + i;
}
int len = 0;
word &= ALL_ONES_WITHOUT_MSB;
int[] buffer = this.buffer;
while (word != 0) {
int trailingZeros = Integer.numberOfTrailingZeros(word);
offset += trailingZeros;
buffer[len++] = offset;
word >>= trailingZeros;
word--; // clear the lowest bit
}
this.len = len;
current = fromBeginning ? 0 : len;
}

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