Nearest Integer Functions

The Intel Math library supports the following nearest integer functions:

CEIL

Description: The ceil function returns the smallest integral value not less than x as a floating-point number. This function may be inlined with the Itanium® compiler.

Calling interface:
double ceil(double x);
long double ceill(long double x);
float ceilf(float x);

FLOOR

Description: The floor function returns the largest integral value not greater than x as a floating-point value. This function may be inlined with the Itanium® compiler.

Calling interface:
double floor(double x);
long double floorl(long double x);
float floorf(float x);

LLRINT

Description: The llrint function returns the rounded integer value (according to the current rounding direction) as a long long int.

errno: ERANGE, for values too large

Calling interface:
long long int llrint(double x);
long long int llrintl(long double x);
long long int llrintf(float x);

LLROUND

Description: The llround function returns the rounded integer value as a long long int.

errno: ERANGE, for values too large

Calling interface:
long long int llround(double x);
long long int llroundl(long double x);
long long int llroundf(float x);

LRINT

Description: The lrint function returns the rounded integer value (according to the current rounding direction) as a long int.

Calling interface:
long int lrint(double x);
long int lrintl(long double x);
long int lrintf(float x);

LROUND

Description: The lround function returns the rounded integer value as a long int. Halfway cases are rounded away from zero.

errno: ERANGE, for values too large

Calling interface:
long int lround(double x);
long int lroundl(long double x);
long int lroundf(float x);

MODF

Description: The modf function returns the value of the signed fractional part of x and stores the integral part at x *iptr as a floating-point number.

Calling interface:
double modf(double x, double *iptr);
long double modfl(long double x, long double *iptr);
float modff(float x, float *iptr);

NEARBYINT

Description: The nearbyint function returns the rounded integral value as a floating-point number, using the current rounding direction.

Calling interface:
double nearbyint(double x);
long double nearbyintl(long double x);
float nearbyintf(float x);

RINT

Description: The rint function returns the rounded integral value as a floating-point number, using the current rounding direction.

Calling interface:
double rint(double x);
long double rintl(long double x);
float rintf(float x);

ROUND

Description: The round function returns the nearest integral value as a floating-point number. Halfway cases are rounded away from zero.

Calling interface:
double round(double x);
long double roundl(long double x);
float roundf(float x);

TRUNC

Description: The trunc function returns the truncated integral value as a floating-point number.

Calling interface:
double trunc(double x);
long double truncl(long double x);
float truncf(float x);