18 lines
581 B
JavaScript
18 lines
581 B
JavaScript
"use strict";
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function nextPow2(v) {
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return v += v === 0 ? 1 : 0, --v, v |= v >>> 1, v |= v >>> 2, v |= v >>> 4, v |= v >>> 8, v |= v >>> 16, v + 1;
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}
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function isPow2(v) {
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return !(v & v - 1) && !!v;
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}
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function log2(v) {
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let r = (v > 65535 ? 1 : 0) << 4;
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v >>>= r;
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let shift = (v > 255 ? 1 : 0) << 3;
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return v >>>= shift, r |= shift, shift = (v > 15 ? 1 : 0) << 2, v >>>= shift, r |= shift, shift = (v > 3 ? 1 : 0) << 1, v >>>= shift, r |= shift, r | v >> 1;
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}
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exports.isPow2 = isPow2;
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exports.log2 = log2;
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exports.nextPow2 = nextPow2;
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//# sourceMappingURL=pow2.js.map
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