/// return true.
bool getExactInverse(APFloat *inv) const;
+ /// \brief Returns the exponent of the internal representation of the APFloat.
+ ///
+ /// Because the radix of APFloat is 2, this is equivalent to floor(log2(x)).
+ friend APFloat logb(const APFloat &Arg) {
+ if (Arg.isZero() || Arg.isNaN())
+ return Arg;
+
+ if (Arg.isInfinity())
+ return APFloat::getInf(Arg.getSemantics());
+
+ APFloat Result(Arg.getSemantics(), std::abs(Arg.exponent));
+ if (Arg.exponent < 0)
+ Result.changeSign();
+ return Result;
+ }
+
private:
/// \name Simple Queries
/// This additional declaration is required in order to compile LLVM with IBM
/// xlC compiler.
hash_code hash_value(const APFloat &Arg);
+
} // namespace llvm
#endif // LLVM_ADT_APFLOAT_H