-// $Id$ -*-c++-*-
-//***************************************************************************
-// File:
-// MathExtras.h
+//===-- llvm/Support/MathExtras.h - Useful math functions -------*- C++ -*-===//
//
-// Purpose:
-//
-// History:
-// 8/25/01 - Vikram Adve - Created
-//**************************************************************************/
-
-#ifndef LLVM_SUPPORT_MATH_EXTRAS_H
-#define LLVM_SUPPORT_MATH_EXTRAS_H
-
-#include <sys/types.h>
-
-inline bool IsPowerOf2 (int64_t C, unsigned& getPow);
-
-inline
-bool IsPowerOf2(int64_t C, unsigned& getPow)
-{
- if (C < 0)
- C = -C;
- bool isBool = C > 0 && (C == (C & ~(C - 1)));
- if (isBool)
- for (getPow = 0; C > 1; getPow++)
- C = C >> 1;
-
- return isBool;
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains some functions that are useful for math stuff.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_MATHEXTRAS_H
+#define LLVM_SUPPORT_MATHEXTRAS_H
+
+#include "llvm/Support/DataTypes.h"
+
+namespace llvm {
+
+#if defined(log2)
+# undef log2
+#endif
+
+inline unsigned log2(uint64_t C) {
+ unsigned getPow;
+ for (getPow = 0; C > 1; ++getPow)
+ C >>= 1;
+ return getPow;
+}
+
+inline unsigned log2(unsigned C) {
+ unsigned getPow;
+ for (getPow = 0; C > 1; ++getPow)
+ C >>= 1;
+ return getPow;
+}
+
+inline bool isPowerOf2(int64_t C, unsigned &getPow) {
+ if (C < 0) C = -C;
+ if (C > 0 && C == (C & ~(C - 1))) {
+ getPow = log2(static_cast<uint64_t>(C));
+ return true;
+ }
+
+ return false;
}
-#endif /*LLVM_SUPPORT_MATH_EXTRAS_H*/
+// Platform-independent wrappers for the C99 isnan() function.
+int IsNAN (float f);
+int IsNAN (double d);
+
+// Platform-independent wrappers for the C99 isinf() function.
+int IsInf (float f);
+int IsInf (double d);
+
+} // End llvm namespace
+
+#endif