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Last change
on this file since 297 was
169,
checked in by mulligan, 11 years ago
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Latest test C file: fast roundup to closest power of two.
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File size:
269 bytes
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| Rev | Line | |
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| [169] | 1 | /* For 16 bit unsigned integers. */ |
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| 2 | unsigned int round_up(unsigned int v) |
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| 3 | { |
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| 4 | v--; |
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| 5 | v |= v >> 1; |
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| 6 | v |= v >> 2; |
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| 7 | v |= v >> 4; |
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| 8 | v |= v >> 8; |
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| 9 | v++; |
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| 10 | return v; |
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| 11 | } |
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| 12 | |
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| 13 | int main() |
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| 14 | { |
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| 15 | unsigned int f; |
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| 16 | f = round_up(125); |
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| 17 | if(f == 128) |
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| 18 | return 5; |
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| 19 | else |
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| 20 | return 7; |
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| 21 | } |
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