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a7d03b466a
Patch contributed by Bill Wendling. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15055 91177308-0d34-0410-b5e6-96231b3b80d8
53 lines
1.2 KiB
C++
53 lines
1.2 KiB
C++
//===-- Support/MathExtras.h - Useful math functions ------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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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_MATHEXTRAS_H
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#define SUPPORT_MATHEXTRAS_H
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#include "Support/DataTypes.h"
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namespace llvm {
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#if defined(log2)
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# undef log2
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#endif
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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(static_cast<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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// Platform-independent wrappers for the C99 isnan() function.
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int IsNAN (float f);
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int IsNAN (double d);
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// Platform-independent wrappers for the C99 isinf() function.
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int IsInf (float f);
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int IsInf (double d);
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} // End llvm namespace
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#endif
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