Collaboration diagram for Basics::BigInt:

Static Public Member Functions
static uint64	accumulateNN (void outBuf, const void buf1, int nWords)
	Add number on to a temporary No null handling Returns carry.

static uint64	addNN (void outBuf, const void buf1, const void *buf2, int nWords)
	Add together 2 numbers w/ same number of digits No null handling Returns carry.

static void	castNumeric (uint64 wordso, int nwdso, Typemod typmodo, uint64 wordsi, int nwdsi, Typemod typmodi)

static void	castNumeric (uint64 wordso, int nwdso, int32 numericattro, uint64 wordsi, int nwdsi, int32 numericattri)

static bool	checkOverflowNN (const void *po, int nwdso, Typemod typmodo)

static bool	checkOverflowNN (const void *po, int nwo, int nwdso, Typemod typmodo)

static bool	checkOverflowNN (const void *po, int nwdso, int32 numericattro)

static bool	checkOverflowNN (const void *po, int nwo, int nwdso, int32 numericattro)

static int	compareNN (const void buf1, const void buf2, int nWords)
	Compare integers, return -1, 0, 1.

static long double	convertPosToFloatNN (const void *bbuf, int bwords)
	Convert Numeric to a float helper function Input should not be negative / null.

static void	copy (void buf, const void src, int nWords)
	cpoy nWords from src to buf

static uint64	divUnsignedN1 (void qbuf, int qw, int round, const void ubuf, int uw, uint64 v)

static void	divUnsignedNN (void qbuf, int qw, int round, uint64 rbuf, int rw, const void ubuf, int uw, const void vbuf, int vw)

static void	fromIntNN (void *buf, int nWords, int64 val)
	Load from 64-bit signed int (does not handle NULL inside)

static void	incrementNN (void *buf, int nWords)
	Increment by 1.

static void	invertSign (void *buf, int nWords)
	Invert the sign of a number, performed in place, using the invert and +1 method, turns out NULLs are OK in this sense.

static bool	isEqualNN (const void buf1, const void buf2, int nWords)
	Check integers for equality. More...

static bool	isNeg (const void *buf, int nWords)
	Check if integer is less than zero.

static bool	isNull (const void *buf, int nWords)
	Check an integer for NULL.

static bool	isZero (const void *buf, int nWords)
	Check an integer for 0. More...

static void	mulUnsignedN1 (void obuf, const void ubuf, int uw, uint64 v)
	Multiply, unsigned only. uw words by 1 word -> uw+1 words Output array must be uw+1 words long; may not overlap inputs.

static void	mulUnsignedNN (void obuf, const void buf1, int nw1, const void *buf2, int nw2)
	Multiply, unsigned only. Output array must be nw1+nw2 long; may not overlap inputs PERF NOTE: Operates like a school boy, could do Karatsuba (or better)

static void	numericDivide (const uint64 pa, int nwdsa, Typemod typmoda, const uint64 pb, int nwdsb, Typemod typmodb, uint64 *outNum, int nwdso, Typemod typmodo)
	Divide Numerics Handles negative / null input.

static void	numericDivide (const uint64 pa, int nwdsa, int32 numericattra, const uint64 pb, int nwdsb, int32 numericattrb, uint64 *outNum, int nwdso, int32 numericattro)

static void	numericMultiply (const uint64 pa, int nwdsa, const uint64 pb, int nwdsb, uint64 *outNum, int nwdso)
	Multiply Numerics , result in outNum Handles negative / null input.

static void	NumericRescaleDown (uint64 wordso, int nwdso, Typemod typmodo, uint64 wordsi, int nwdsi, Typemod typmodi)

static void	NumericRescaleDown (uint64 wordso, int nwdso, int32 numericattro, uint64 wordsi, int nwdsi, int32 numericattri)

static void	NumericRescaleSameScaleSmallerPrec (uint64 wordso, int nwdso, Typemod typmodo, uint64 wordsi, int nwdsi, Typemod typmodi)

static void	NumericRescaleSameScaleSmallerPrec (uint64 wordso, int nwdso, int32 numericattro, uint64 wordsi, int nwdsi, int32 numericattri)

static void	NumericRescaleUp (uint64 wordso, int nwdso, Typemod typmodo, uint64 wordsi, int nwdsi, Typemod typmodi)

static void	NumericRescaleUp (uint64 wordso, int nwdso, int32 numericattro, uint64 wordsi, int nwdsi, int32 numericattri)

static ifloat	numericToFloat (const void *buf, int nwds, ifloat tenthtoscale)
	Convert Numeric to a float Handles negative / null input. More...

static bool	rescaleNumeric (void out, int ow, int pout, int sout, void in, int iw, int pin, int sin)
	Rescale a given numeric to a specific prec/scale/nwds The input should have minimal precision to avoid unnecessary overflow; for example, "0" should have precision 0 (as generated by charToNumeric). Accepts signed numerics. Will set its "in" argument to abs(in).

static bool	setFromFloat (void *bbuf, int bwords, Typemod typmod, long double value, bool round)
	Convert floating point multiplied by 10^scale to an integer This truncates if round is false; otherwise the numeric result is rounded. More...

static bool	setFromFloat (void *bbuf, int bwords, int32 numericattr, long double value, bool round)

static void	setNull (void *buf, int nWords)
	Set an integer to NULL.

static void	setNumericBoundsFromType (uint64 numUpperBound, uint64 numLowerBound, int nwdso, Typemod typmod)

static void	setNumericBoundsFromType (uint64 numUpperBound, uint64 numLowerBound, int nwdso, int32 numericattr)

static void	setZero (void *buf, int nWords)
	Set an integer to 0.

static void	shiftLeftNN (void *buf, unsigned nw, unsigned bitsToShift)
	Shift a BigInt to the left (<<) by the given number of bits. The given BigInt must be positive and non-null.

static void	shiftRightNN (void *buf, unsigned nw, unsigned bitsToShift)
	Shift a BigInt to the right (>>) by the given number of bits. The given BigInt must be positive and non-null.

static void	subNN (void outBuf, const void buf1, const void *buf2, int nWords)
	Subtract 2 numbers w/ same number of digits No null handling.

static bool	toIntNN (int64 &out, const void *buf, int nWords)
	Convert to int (return false if there was an overflow)

static int	ucompareNN (const void buf1, const void buf2, int nWords)

static int	usedWordsUnsigned (const void *buf, int nWords)
	Calculate number of words that are actually used to represent the value (amount left after stripping leading 0's)

Detailed Description

Holds integer utilities A few are inlined for performance reasons. Most are in vertica.cpp.

Member Function Documentation

static bool Basics::BigInt::isEqualNN	(	const void *	buf1,
		const void *	buf2,
		int	nWords
	)

static

Check integers for equality.

Note: Optimized for small nWords; scan from end and break out of loop

Referenced by Vertica::VNumeric::equal().

static bool Basics::BigInt::isZero	(	const void *	buf,
		int	nWords
	)

static

Check an integer for 0.

Note: Optimized for small nWords; scan from end and break out of loop

Referenced by Vertica::VNumeric::isZero().

static ifloat Basics::BigInt::numericToFloat	(	const void *	buf,
		int	nwds,
		ifloat	tenthtoscale
	)

static

Convert Numeric to a float Handles negative / null input.

Parameters

tenthtoscale 10^-scale of the Numeric

Referenced by Vertica::VNumeric::toFloat().

bool Basics::BigInt::setFromFloat	(	void *	bbuf,
		int	bwords,
		Typemod	typmod,
		long double	value,
		bool	round
	)

static

Convert floating point multiplied by 10^scale to an integer This truncates if round is false; otherwise the numeric result is rounded.

Returns: false if high bits were lost, true if reasonable fidelity was achieved

Referenced by Vertica::VNumeric::copy().

static int Basics::BigInt::ucompareNN	(	const void *	buf1,
		const void *	buf2,
		int	nWords
	)

inlinestatic

Compare integers, return -1, 0, 1

Referenced by Vertica::VNumeric::compareUnsigned().

Static Public Member Functions

Detailed Description

Member Function Documentation