-//===-- Support/MathExtras.h - Useful math functions -------------*- C++ -*--=//
+//===-- llvm/Support/MathExtras.h - Useful math functions -------*- C++ -*-===//
+//
+// 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 SUPPORT_MATH_EXTRAS_H
-#define SUPPORT_MATH_EXTRAS_H
+#ifndef LLVM_SUPPORT_MATHEXTRAS_H
+#define LLVM_SUPPORT_MATHEXTRAS_H
-#include <Support/DataTypes.h>
+#include "llvm/Support/DataTypes.h"
+
+namespace llvm {
+
+#if defined(log2)
+# undef log2
+#endif
inline unsigned log2(uint64_t C) {
unsigned getPow;
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(C);
+ getPow = log2(static_cast<uint64_t>(C));
return true;
}
return false;
}
+// 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