typedef signed short exponent_t;
struct fltSemantics;
+ class APSInt;
class StringRef;
/* When bits of a floating point number are truncated, this enum is
public:
/* We support the following floating point semantics. */
+ static const fltSemantics IEEEhalf;
static const fltSemantics IEEEsingle;
static const fltSemantics IEEEdouble;
static const fltSemantics IEEEquad;
fcZero
};
+ enum uninitializedTag {
+ uninitialized
+ };
+
// Constructors.
- APFloat(const fltSemantics &, const StringRef &);
+ APFloat(const fltSemantics &); // Default construct to 0.0
+ APFloat(const fltSemantics &, StringRef);
APFloat(const fltSemantics &, integerPart);
- APFloat(const fltSemantics &, fltCategory, bool negative, unsigned type=0);
+ APFloat(const fltSemantics &, fltCategory, bool negative);
+ APFloat(const fltSemantics &, uninitializedTag);
explicit APFloat(double d);
explicit APFloat(float f);
explicit APFloat(const APInt &, bool isIEEE = false);
static APFloat getInf(const fltSemantics &Sem, bool Negative = false) {
return APFloat(Sem, fcInfinity, Negative);
}
+
/// getNaN - Factory for QNaN values.
///
/// \param Negative - True iff the NaN generated should be negative.
/// default. The value is truncated as necessary.
static APFloat getNaN(const fltSemantics &Sem, bool Negative = false,
unsigned type = 0) {
- return APFloat(Sem, fcNaN, Negative, type);
+ if (type) {
+ APInt fill(64, type);
+ return getQNaN(Sem, Negative, &fill);
+ } else {
+ return getQNaN(Sem, Negative, 0);
+ }
+ }
+
+ /// getQNan - Factory for QNaN values.
+ static APFloat getQNaN(const fltSemantics &Sem,
+ bool Negative = false,
+ const APInt *payload = 0) {
+ return makeNaN(Sem, false, Negative, payload);
}
+ /// getSNan - Factory for SNaN values.
+ static APFloat getSNaN(const fltSemantics &Sem,
+ bool Negative = false,
+ const APInt *payload = 0) {
+ return makeNaN(Sem, true, Negative, payload);
+ }
+
+ /// getLargest - Returns the largest finite number in the given
+ /// semantics.
+ ///
+ /// \param Negative - True iff the number should be negative
+ static APFloat getLargest(const fltSemantics &Sem, bool Negative = false);
+
+ /// getSmallest - Returns the smallest (by magnitude) finite number
+ /// in the given semantics. Might be denormalized, which implies a
+ /// relative loss of precision.
+ ///
+ /// \param Negative - True iff the number should be negative
+ static APFloat getSmallest(const fltSemantics &Sem, bool Negative = false);
+
+ /// getSmallestNormalized - Returns the smallest (by magnitude)
+ /// normalized finite number in the given semantics.
+ ///
+ /// \param Negative - True iff the number should be negative
+ static APFloat getSmallestNormalized(const fltSemantics &Sem,
+ bool Negative = false);
+
+ /// getAllOnesValue - Returns a float which is bitcasted from
+ /// an all one value int.
+ ///
+ /// \param BitWidth - Select float type
+ /// \param isIEEE - If 128 bit number, select between PPC and IEEE
+ static APFloat getAllOnesValue(unsigned BitWidth, bool isIEEE = false);
+
/// Profile - Used to insert APFloat objects, or objects that contain
/// APFloat objects, into FoldingSets.
void Profile(FoldingSetNodeID& NID) const;
/* C fmod, or llvm frem. */
opStatus mod(const APFloat &, roundingMode);
opStatus fusedMultiplyAdd(const APFloat &, const APFloat &, roundingMode);
+ opStatus roundToIntegral(roundingMode);
/* Sign operations. */
void changeSign();
opStatus convert(const fltSemantics &, roundingMode, bool *);
opStatus convertToInteger(integerPart *, unsigned int, bool,
roundingMode, bool *) const;
+ opStatus convertToInteger(APSInt&, roundingMode, bool *) const;
opStatus convertFromAPInt(const APInt &,
bool, roundingMode);
opStatus convertFromSignExtendedInteger(const integerPart *, unsigned int,
bool, roundingMode);
opStatus convertFromZeroExtendedInteger(const integerPart *, unsigned int,
bool, roundingMode);
- opStatus convertFromString(const StringRef&, roundingMode);
+ opStatus convertFromString(StringRef, roundingMode);
APInt bitcastToAPInt() const;
double convertToDouble() const;
float convertToFloat() const;
const fltSemantics &getSemantics() const { return *semantics; }
bool isZero() const { return category == fcZero; }
bool isNonZero() const { return category != fcZero; }
+ bool isNormal() const { return category == fcNormal; }
bool isNaN() const { return category == fcNaN; }
bool isInfinity() const { return category == fcInfinity; }
bool isNegative() const { return sign; }
APFloat& operator=(const APFloat &);
- /* Return an arbitrary integer value usable for hashing. */
- uint32_t getHashValue() const;
+ /// \brief Overload to compute a hash code for an APFloat value.
+ ///
+ /// Note that the use of hash codes for floating point values is in general
+ /// frought with peril. Equality is hard to define for these values. For
+ /// example, should negative and positive zero hash to different codes? Are
+ /// they equal or not? This hash value implementation specifically
+ /// emphasizes producing different codes for different inputs in order to
+ /// be used in canonicalization and memoization. As such, equality is
+ /// bitwiseIsEqual, and 0 != -0.
+ friend hash_code hash_value(const APFloat &Arg);
+
+ /// Converts this value into a decimal string.
+ ///
+ /// \param FormatPrecision The maximum number of digits of
+ /// precision to output. If there are fewer digits available,
+ /// zero padding will not be used unless the value is
+ /// integral and small enough to be expressed in
+ /// FormatPrecision digits. 0 means to use the natural
+ /// precision of the number.
+ /// \param FormatMaxPadding The maximum number of zeros to
+ /// consider inserting before falling back to scientific
+ /// notation. 0 means to always use scientific notation.
+ ///
+ /// Number Precision MaxPadding Result
+ /// ------ --------- ---------- ------
+ /// 1.01E+4 5 2 10100
+ /// 1.01E+4 4 2 1.01E+4
+ /// 1.01E+4 5 1 1.01E+4
+ /// 1.01E-2 5 2 0.0101
+ /// 1.01E-2 4 2 0.0101
+ /// 1.01E-2 4 1 1.01E-2
+ void toString(SmallVectorImpl<char> &Str,
+ unsigned FormatPrecision = 0,
+ unsigned FormatMaxPadding = 3) const;
+
+ /// getExactInverse - If this value has an exact multiplicative inverse,
+ /// store it in inv and return true.
+ bool getExactInverse(APFloat *inv) const;
private:
opStatus modSpecials(const APFloat &);
/* Miscellany. */
- void makeNaN(unsigned = 0);
+ static APFloat makeNaN(const fltSemantics &Sem, bool SNaN, bool Negative,
+ const APInt *fill);
+ void makeNaN(bool SNaN = false, bool Neg = false, const APInt *fill = 0);
opStatus normalize(roundingMode, lostFraction);
opStatus addOrSubtract(const APFloat &, roundingMode, bool subtract);
cmpResult compareAbsoluteValue(const APFloat &) const;
roundingMode, bool *) const;
opStatus convertFromUnsignedParts(const integerPart *, unsigned int,
roundingMode);
- opStatus convertFromHexadecimalString(const StringRef&, roundingMode);
- opStatus convertFromDecimalString (const StringRef&, roundingMode);
+ opStatus convertFromHexadecimalString(StringRef, roundingMode);
+ opStatus convertFromDecimalString(StringRef, roundingMode);
char *convertNormalToHexString(char *, unsigned int, bool,
roundingMode) const;
opStatus roundSignificandWithExponent(const integerPart *, unsigned int,
int, roundingMode);
+ APInt convertHalfAPFloatToAPInt() const;
APInt convertFloatAPFloatToAPInt() const;
APInt convertDoubleAPFloatToAPInt() const;
APInt convertQuadrupleAPFloatToAPInt() const;
APInt convertF80LongDoubleAPFloatToAPInt() const;
APInt convertPPCDoubleDoubleAPFloatToAPInt() const;
void initFromAPInt(const APInt& api, bool isIEEE = false);
+ void initFromHalfAPInt(const APInt& api);
void initFromFloatAPInt(const APInt& api);
void initFromDoubleAPInt(const APInt& api);
void initFromQuadrupleAPInt(const APInt &api);
projects / oota-llvm.git / blobdiff