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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3800 91177308-0d34-0410-b5e6-96231b3b80d8
30 lines
647 B
C++
30 lines
647 B
C++
//===-- Support/MathExtras.h - Useful math functions -------------*- C++ -*--=//
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//
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// This file contains some functions that are useful for math stuff.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SUPPORT_MATH_EXTRAS_H
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#define SUPPORT_MATH_EXTRAS_H
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#include <Support/DataTypes.h>
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inline unsigned log2(uint64_t C) {
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unsigned getPow;
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for (getPow = 0; C > 1; ++getPow)
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C >>= 1;
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return getPow;
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}
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inline bool isPowerOf2(int64_t C, unsigned &getPow) {
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if (C < 0) C = -C;
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if (C > 0 && C == (C & ~(C - 1))) {
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getPow = log2((uint64_t)C);
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return true;
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}
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return false;
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}
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#endif
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