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optimize roundUpToPowerOfTwo #6067

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merged 1 commit into from
Feb 17, 2020
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optimize roundUpToPowerOfTwo #6067

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optimize power2
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@ahorek
ahorek committed Feb 15, 2020
commit 2d8d71ac2ef8f80784337b368d8a5be5d1625c7f
11 changes: 2 additions & 9 deletions core/src/main/java/org/jruby/ext/ffi/Util.java
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Original file line number Diff line number Diff line change
Expand Up @@ -199,14 +199,7 @@ public static ByteOrder parseByteOrder(Ruby runtime, IRubyObject byte_order) {
}

public static int roundUpToPowerOfTwo(int v) {
if (v < 1) return 1;
v--;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;

return v + 1;
if (v <= 1) return 1;
return Integer.MIN_VALUE >>> Integer.numberOfLeadingZeros(v - 1) << 1;
}
}