fast_double_parser Namespace Reference

Classes
struct	value128

Functions
really_inline uint64_t	Emulate64x64to128 (uint64_t &r_hi, const uint64_t x, const uint64_t y)
really_inline value128	full_multiplication (uint64_t value1, uint64_t value2)
int	leading_zeroes (uint64_t input_num)
static bool	is_integer (char c)
really_inline double	compute_float_64 (int64_t power, uint64_t i, bool negative, bool *success)
static const char *	parse_float_strtod (const char *ptr, double *outDouble)
WARN_UNUSED const really_inline char *	parse_number (const char *p, double *outDouble)

Function Documentation

compute_float_64()

really_inline double fast_double_parser::compute_float_64	(	int64_t	power,
		uint64_t	i,
		bool	negative,
		bool *	success
	)

When mapping numbers from decimal to binary, we go from w * 10^q to m * 2^p but we have 10^q = 5^q * 2^q, so effectively we are trying to match w * 2^q * 5^q to m * 2^p. Thus the powers of two are not a concern since they can be represented exactly using the binary notation, only the powers of five affect the binary significand.

Emulate64x64to128()

really_inline uint64_t fast_double_parser::Emulate64x64to128	(	uint64_t &	r_hi,
		const uint64_t	x,
		const uint64_t	y
	)

full_multiplication()

really_inline value128 fast_double_parser::full_multiplication	(	uint64_t	value1,
		uint64_t	value2
	)

is_integer()

static bool fast_double_parser::is_integer ( char  c )

inlinestatic

leading_zeroes()

int fast_double_parser::leading_zeroes ( uint64_t  input_num )

inline

parse_float_strtod()

static const char* fast_double_parser::parse_float_strtod ( const char *  ptr, double *  outDouble  )

static

parse_number()

WARN_UNUSED const really_inline char* fast_double_parser::parse_number	(	const char *	p,
		double *	outDouble
	)