Adam Macdonald
a8d8b9b9ab
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38 lines
762 B
C++
38 lines
762 B
C++
#pragma once
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#include <cstdint>
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namespace kuiper
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{
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// https://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2
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inline std::uint64_t next_pow2(std::uint64_t value) {
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value--;
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value |= value >> 1;
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value |= value >> 2;
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value |= value >> 4;
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value |= value >> 8;
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value |= value >> 16;
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value |= value >> 32;
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value++;
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value += (value == 0); // Case for if value == 0 (returns 0 as the next power of 2, which 0 is not)
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return value;
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}
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inline std::uint32_t next_pow2(std::uint32_t value) {
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value--;
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value |= value >> 1;
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value |= value >> 2;
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value |= value >> 4;
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value |= value >> 8;
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value |= value >> 16;
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value++;
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value += (value == 0);
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return value;
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}
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} // namespace kuiper
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