1.2. Single Precision Mathematical Functions
This section describes single precision mathematical functions.
Functions
- __device__ float acosf ( float x )
- Calculate the arc cosine of the input argument.
- __device__ float acoshf ( float x )
- Calculate the nonnegative arc hyperbolic cosine of the input argument.
- __device__ float asinf ( float x )
- Calculate the arc sine of the input argument.
- __device__ float asinhf ( float x )
- Calculate the arc hyperbolic sine of the input argument.
- __device__ float atan2f ( float x, float y )
- Calculate the arc tangent of the ratio of first and second input arguments.
- __device__ float atanf ( float x )
- Calculate the arc tangent of the input argument.
- __device__ float atanhf ( float x )
- Calculate the arc hyperbolic tangent of the input argument.
- __device__ float cbrtf ( float x )
- Calculate the cube root of the input argument.
- __device__ float ceilf ( float x )
- Calculate ceiling of the input argument.
- __device__ float copysignf ( float x, float y )
- Create value with given magnitude, copying sign of second value.
- __device__ float cosf ( float x )
- Calculate the cosine of the input argument.
- __device__ float coshf ( float x )
- Calculate the hyperbolic cosine of the input argument.
- __device__ float cospif ( float x )
- Calculate the cosine of the input argument .
- __device__ float erfcf ( float x )
- Calculate the complementary error function of the input argument.
- __device__ float erfcinvf ( float y )
- Calculate the inverse complementary error function of the input argument.
- __device__ float erfcxf ( float x )
- Calculate the scaled complementary error function of the input argument.
- __device__ float erff ( float x )
- Calculate the error function of the input argument.
- __device__ float erfinvf ( float y )
- Calculate the inverse error function of the input argument.
- __device__ float exp10f ( float x )
- Calculate the base 10 exponential of the input argument.
- __device__ float exp2f ( float x )
- Calculate the base 2 exponential of the input argument.
- __device__ float expf ( float x )
- Calculate the base exponential of the input argument.
- __device__ float expm1f ( float x )
- Calculate the base exponential of the input argument, minus 1.
- __device__ float fabsf ( float x )
- Calculate the absolute value of its argument.
- __device__ float fdimf ( float x, float y )
- Compute the positive difference between x and y.
- __device__ float fdividef ( float x, float y )
- Divide two floating point values.
- __device__ float floorf ( float x )
- Calculate the largest integer less than or equal to x.
- __device__ float fmaf ( float x, float y, float z )
- Compute as a single operation.
- __device__ float fmaxf ( float x, float y )
- Determine the maximum numeric value of the arguments.
- __device__ float fminf ( float x, float y )
- Determine the minimum numeric value of the arguments.
- __device__ float fmodf ( float x, float y )
- Calculate the floating-point remainder of x / y.
- __device__ float frexpf ( float x, int* nptr )
- Extract mantissa and exponent of a floating-point value.
- __device__ float hypotf ( float x, float y )
- Calculate the square root of the sum of squares of two arguments.
- __device__ int ilogbf ( float x )
- Compute the unbiased integer exponent of the argument.
- __device__ int isfinite ( float a )
- Determine whether argument is finite.
- __device__ int isinf ( float a )
- Determine whether argument is infinite.
- __device__ int isnan ( float a )
- Determine whether argument is a NaN.
- __device__ float j0f ( float x )
- Calculate the value of the Bessel function of the first kind of order 0 for the input argument.
- __device__ float j1f ( float x )
- Calculate the value of the Bessel function of the first kind of order 1 for the input argument.
- __device__ float jnf ( int n, float x )
- Calculate the value of the Bessel function of the first kind of order n for the input argument.
- __device__ float ldexpf ( float x, int exp )
- Calculate the value of .
- __device__ float lgammaf ( float x )
- Calculate the natural logarithm of the absolute value of the gamma function of the input argument.
- __device__ long long int llrintf ( float x )
- Round input to nearest integer value.
- __device__ long long int llroundf ( float x )
- Round to nearest integer value.
- __device__ float log10f ( float x )
- Calculate the base 10 logarithm of the input argument.
- __device__ float log1pf ( float x )
- Calculate the value of .
- __device__ float log2f ( float x )
- Calculate the base 2 logarithm of the input argument.
- __device__ float logbf ( float x )
- Calculate the floating point representation of the exponent of the input argument.
- __device__ float logf ( float x )
- Calculate the natural logarithm of the input argument.
- __device__ long int lrintf ( float x )
- Round input to nearest integer value.
- __device__ long int lroundf ( float x )
- Round to nearest integer value.
- __device__ float modff ( float x, float* iptr )
- Break down the input argument into fractional and integral parts.
- __device__ float nanf ( const char* tagp )
- Returns "Not a Number" value.
- __device__ float nearbyintf ( float x )
- Round the input argument to the nearest integer.
- __device__ float nextafterf ( float x, float y )
- Return next representable single-precision floating-point value afer argument.
- __device__ float normcdff ( float y )
- Calculate the standard normal cumulative distribution function.
- __device__ float normcdfinvf ( float y )
- Calculate the inverse of the standard normal cumulative distribution function.
- __device__ float powf ( float x, float y )
- Calculate the value of first argument to the power of second argument.
- __device__ float rcbrtf ( float x )
- Calculate reciprocal cube root function.
- __device__ float remainderf ( float x, float y )
- Compute single-precision floating-point remainder.
- __device__ float remquof ( float x, float y, int* quo )
- Compute single-precision floating-point remainder and part of quotient.
- __device__ float rintf ( float x )
- Round input to nearest integer value in floating-point.
- __device__ float roundf ( float x )
- Round to nearest integer value in floating-point.
- __device__ float rsqrtf ( float x )
- Calculate the reciprocal of the square root of the input argument.
- __device__ float scalblnf ( float x, long int n )
- Scale floating-point input by integer power of two.
- __device__ float scalbnf ( float x, int n )
- Scale floating-point input by integer power of two.
- __device__ int signbit ( float a )
- Return the sign bit of the input.
- __device__ void sincosf ( float x, float* sptr, float* cptr )
- Calculate the sine and cosine of the first input argument.
- __device__ void sincospif ( float x, float* sptr, float* cptr )
- Calculate the sine and cosine of the first input argument .
- __device__ float sinf ( float x )
- Calculate the sine of the input argument.
- __device__ float sinhf ( float x )
- Calculate the hyperbolic sine of the input argument.
- __device__ float sinpif ( float x )
- Calculate the sine of the input argument .
- __device__ float sqrtf ( float x )
- Calculate the square root of the input argument.
- __device__ float tanf ( float x )
- Calculate the tangent of the input argument.
- __device__ float tanhf ( float x )
- Calculate the hyperbolic tangent of the input argument.
- __device__ float tgammaf ( float x )
- Calculate the gamma function of the input argument.
- __device__ float truncf ( float x )
- Truncate input argument to the integral part.
- __device__ float y0f ( float x )
- Calculate the value of the Bessel function of the second kind of order 0 for the input argument.
- __device__ float y1f ( float x )
- Calculate the value of the Bessel function of the second kind of order 1 for the input argument.
- __device__ float ynf ( int n, float x )
- Calculate the value of the Bessel function of the second kind of order n for the input argument.
Functions
- __device__ float acosf ( float x )
-
Calculate the arc cosine of the input argument.
Returns
Result will be in radians, in the interval [0, ] for x inside [-1, +1].
- acosf(1) returns +0.
- acosf(x) returns NaN for x outside [-1, +1].
Description
Calculate the principal value of the arc cosine of the input argument x.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float acoshf ( float x )
-
Calculate the nonnegative arc hyperbolic cosine of the input argument.
Returns
Result will be in the interval [0, ].
- acoshf(1) returns 0.
- acoshf(x) returns NaN for x in the interval [ , 1).
Description
Calculate the nonnegative arc hyperbolic cosine of the input argument x.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float asinf ( float x )
-
Calculate the arc sine of the input argument.
Returns
Result will be in radians, in the interval [- , + ] for x inside [-1, +1].
- asinf(0) returns +0.
- asinf(x) returns NaN for x outside [-1, +1].
Description
Calculate the principal value of the arc sine of the input argument x.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float asinhf ( float x )
-
Calculate the arc hyperbolic sine of the input argument.
Returns
- asinhf(0) returns 1.
Description
Calculate the arc hyperbolic sine of the input argument x.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float atan2f ( float x, float y )
-
Calculate the arc tangent of the ratio of first and second input arguments.
Returns
Result will be in radians, in the interval [- , + ].
- atan2f(0, 1) returns +0.
Description
Calculate the principal value of the arc tangent of the ratio of first and second input arguments x / y. The quadrant of the result is determined by the signs of inputs x and y.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float atanf ( float x )
-
Calculate the arc tangent of the input argument.
Returns
Result will be in radians, in the interval [- , + ].
- atanf(0) returns +0.
Description
Calculate the principal value of the arc tangent of the input argument x.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float atanhf ( float x )
-
Calculate the arc hyperbolic tangent of the input argument.
Returns
- atanhf( ) returns .
- atanhf( ) returns .
- atanhf(x) returns NaN for x outside interval [-1, 1].
Description
Calculate the arc hyperbolic tangent of the input argument x.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float cbrtf ( float x )
-
Calculate the cube root of the input argument.
Returns
Returns .
- cbrtf( ) returns .
- cbrtf( ) returns .
Description
Calculate the cube root of x, .
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float ceilf ( float x )
-
Calculate ceiling of the input argument.
Returns
Returns expressed as a floating-point number.
- ceilf( ) returns .
- ceilf( ) returns .
Description
Compute the smallest integer value not less than x.
- __device__ float copysignf ( float x, float y )
-
Create value with given magnitude, copying sign of second value.
Returns
Returns a value with the magnitude of x and the sign of y.
Description
Create a floating-point value with the magnitude x and the sign of y.
- __device__ float cosf ( float x )
-
Calculate the cosine of the input argument.
Returns
- cosf(0) returns 1.
- cosf( ) returns NaN.
Description
Calculate the cosine of the input argument x (measured in radians).
Note:-
For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
-
This function is affected by the --use_fast_math compiler flag. See the CUDA C Programming Guide, Appendix C, Table C-3 for a complete list of functions affected.
- __device__ float coshf ( float x )
-
Calculate the hyperbolic cosine of the input argument.
Returns
- coshf(0) returns 1.
- coshf( ) returns NaN.
Description
Calculate the hyperbolic cosine of the input argument x.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float cospif ( float x )
-
Calculate the cosine of the input argument .
Returns
- cospif( ) returns 1.
- cospif( ) returns NaN.
Description
Calculate the cosine of x (measured in radians), where x is the input argument.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float erfcf ( float x )
-
Calculate the complementary error function of the input argument.
Returns
- erfcf( ) returns 2.
- erfcf( ) returns +0.
Description
Calculate the complementary error function of the input argument x, 1 - erf(x).
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float erfcinvf ( float y )
-
Calculate the inverse complementary error function of the input argument.
Returns
- erfcinvf(0) returns .
- erfcinvf(2) returns .
Description
Calculate the inverse complementary error function of the input argument y, for y in the interval [0, 2]. The inverse complementary error function find the value x that satisfies the equation y = erfc(x), for , and .
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float erfcxf ( float x )
-
Calculate the scaled complementary error function of the input argument.
Returns
- erfcxf( ) returns
- erfcxf( ) returns +0
- erfcxf(x) returns if the correctly calculated value is outside the single floating point range.
Description
Calculate the scaled complementary error function of the input argument x, .
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float erff ( float x )
-
Calculate the error function of the input argument.
Returns
- erff( ) returns .
- erff( ) returns .
Description
Calculate the value of the error function for the input argument x, .
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float erfinvf ( float y )
-
Calculate the inverse error function of the input argument.
Returns
- erfinvf(1) returns .
- erfinvf(-1) returns .
Description
Calculate the inverse error function of the input argument y, for y in the interval [-1, 1]. The inverse error function finds the value x that satisfies the equation y = erf(x), for , and .
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float exp10f ( float x )
-
Calculate the base 10 exponential of the input argument.
Returns
Returns .
Description
Calculate the base 10 exponential of the input argument x.
Note:-
For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
-
This function is affected by the --use_fast_math compiler flag. See the CUDA C Programming Guide, Appendix C, Table C-3 for a complete list of functions affected.
-
- __device__ float exp2f ( float x )
-
Calculate the base 2 exponential of the input argument.
Returns
Returns .
Description
Calculate the base 2 exponential of the input argument x.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float expf ( float x )
-
Calculate the base exponential of the input argument.
Returns
Returns .
Description
Calculate the base exponential of the input argument x, .
Note:-
For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
-
This function is affected by the --use_fast_math compiler flag. See the CUDA C Programming Guide, Appendix C, Table C-3 for a complete list of functions affected.
-
- __device__ float expm1f ( float x )
-
Calculate the base exponential of the input argument, minus 1.
Returns
Returns .
Description
Calculate the base exponential of the input argument x, minus 1.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float fabsf ( float x )
-
Calculate the absolute value of its argument.
Returns
Returns the absolute value of its argument.
- fabs( ) returns .
- fabs( ) returns 0.
Description
Calculate the absolute value of the input argument x.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float fdimf ( float x, float y )
-
Compute the positive difference between x and y.
Returns
Returns the positive difference between x and y.
- fdimf(x, y) returns x - y if x > y.
- fdimf(x, y) returns +0 if xy.
Description
Compute the positive difference between x and y. The positive difference is x - y when x > y and +0 otherwise.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float fdividef ( float x, float y )
-
Divide two floating point values.
Returns
Returns x / y.
Description
Compute x divided by y. If --use_fast_math is specified, use __fdividef() for higher performance, otherwise use normal division.
Note:-
For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
-
This function is affected by the --use_fast_math compiler flag. See the CUDA C Programming Guide, Appendix C, Table C-3 for a complete list of functions affected.
-
- __device__ float floorf ( float x )
-
Calculate the largest integer less than or equal to x.
Returns
Returns expressed as a floating-point number.
- floorf( ) returns .
- floorf( ) returns .
Description
Calculate the largest integer value which is less than or equal to x.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float fmaf ( float x, float y, float z )
-
Compute as a single operation.
Returns
Returns the rounded value of as a single operation.
- fmaf( , , z) returns NaN.
- fmaf( , , z) returns NaN.
- fmaf(x, y, ) returns NaN if is an exact .
- fmaf(x, y, ) returns NaN if is an exact .
Description
Compute the value of as a single ternary operation. After computing the value to infinite precision, the value is rounded once.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float fmaxf ( float x, float y )
-
Determine the maximum numeric value of the arguments.
Returns
Returns the maximum numeric values of the arguments x and y.
- If both arguments are NaN, returns NaN.
- If one argument is NaN, returns the numeric argument.
Description
Determines the maximum numeric value of the arguments x and y. Treats NaN arguments as missing data. If one argument is a NaN and the other is legitimate numeric value, the numeric value is chosen.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float fminf ( float x, float y )
-
Determine the minimum numeric value of the arguments.
Returns
Returns the minimum numeric values of the arguments x and y.
- If both arguments are NaN, returns NaN.
- If one argument is NaN, returns the numeric argument.
Description
Determines the minimum numeric value of the arguments x and y. Treats NaN arguments as missing data. If one argument is a NaN and the other is legitimate numeric value, the numeric value is chosen.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float fmodf ( float x, float y )
-
Calculate the floating-point remainder of x / y.
Returns
- Returns the floating point remainder of x / y.
- fmodf( , y) returns if y is not zero.
- fmodf(x, y) returns NaN and raised an invalid floating point exception if x is or y is zero.
- fmodf(x, y) returns zero if y is zero or the result would overflow.
- fmodf(x, ) returns x if x is finite.
- fmodf(x, 0) returns NaN.
Description
Calculate the floating-point remainder of x / y. The absolute value of the computed value is always less than y's absolute value and will have the same sign as x.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float frexpf ( float x, int* nptr )
-
Extract mantissa and exponent of a floating-point value.
Returns
Returns the fractional component m.
- frexp(0, nptr) returns 0 for the fractional component and zero for the integer component.
- frexp( , nptr) returns and stores zero in the location pointed to by nptr.
- frexp( , nptr) returns and stores an unspecified value in the location to which nptr points.
- frexp(NaN, y) returns a NaN and stores an unspecified value in the location to which nptr points.
Description
Decomposes the floating-point value x into a component m for the normalized fraction element and another term n for the exponent. The absolute value of m will be greater than or equal to 0.5 and less than 1.0 or it will be equal to 0; . The integer exponent n will be stored in the location to which nptr points.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float hypotf ( float x, float y )
-
Calculate the square root of the sum of squares of two arguments.
Returns
Returns the length of the hypotenuse . If the correct value would overflow, returns . If the correct value would underflow, returns 0.
Description
Calculates the length of the hypotenuse of a right triangle whose two sides have lengths x and y without undue overflow or underflow.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ int ilogbf ( float x )
-
Compute the unbiased integer exponent of the argument.
Returns
- If successful, returns the unbiased exponent of the argument.
- ilogbf(0) returns INT_MIN.
- ilogbf(NaN) returns NaN.
- ilogbf(x) returns INT_MAX if x is or the correct value is greater than INT_MAX.
- ilogbf(x) return INT_MIN if the correct value is less than INT_MIN.
Description
Calculates the unbiased integer exponent of the input argument x.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ int isfinite ( float a )
-
Determine whether argument is finite.
Returns
Returns a nonzero value if and only if a is a finite value.
Description
Determine whether the floating-point value a is a finite value (zero, subnormal, or normal and not infinity or NaN).
- __device__ int isinf ( float a )
-
Determine whether argument is infinite.
Returns
Returns a nonzero value if and only if a is a infinite value.
Description
Determine whether the floating-point value a is an infinite value (positive or negative).
- __device__ int isnan ( float a )
-
Determine whether argument is a NaN.
Returns
Returns a nonzero value if and only if a is a NaN value.
Description
Determine whether the floating-point value a is a NaN.
- __device__ float j0f ( float x )
-
Calculate the value of the Bessel function of the first kind of order 0 for the input argument.
Returns
Returns the value of the Bessel function of the first kind of order 0.
- j0f( ) returns +0.
- j0f(NaN) returns NaN.
Description
Calculate the value of the Bessel function of the first kind of order 0 for the input argument x, .
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float j1f ( float x )
-
Calculate the value of the Bessel function of the first kind of order 1 for the input argument.
Returns
Returns the value of the Bessel function of the first kind of order 1.
- j1f( ) returns .
- j1f( ) returns +0.
- j1f(NaN) returns NaN.
Description
Calculate the value of the Bessel function of the first kind of order 1 for the input argument x, .
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float jnf ( int n, float x )
-
Calculate the value of the Bessel function of the first kind of order n for the input argument.
Returns
Returns the value of the Bessel function of the first kind of order n.
- jnf(n, NaN) returns NaN.
- jnf(n, x) returns NaN for n < 0.
- jnf(n, ) returns +0.
Description
Calculate the value of the Bessel function of the first kind of order n for the input argument x, .
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float ldexpf ( float x, int exp )
-
Calculate the value of .
Returns
- ldexpf(x) returns if the correctly calculated value is outside the single floating point range.
Description
Calculate the value of of the input arguments x and exp.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float lgammaf ( float x )
-
Calculate the natural logarithm of the absolute value of the gamma function of the input argument.
Returns
- lgammaf(1) returns +0.
- lgammaf(2) returns +0.
- lgammaf(x) returns if the correctly calculated value is outside the single floating point range.
- lgammaf(x) returns if x 0.
- lgammaf( ) returns .
- lgammaf( ) returns .
Description
Calculate the natural logarithm of the absolute value of the gamma function of the input argument x, namely the value of .
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ long long int llrintf ( float x )
-
Round input to nearest integer value.
Returns
Returns rounded integer value.
Description
Round x to the nearest integer value, with halfway cases rounded towards zero. If the result is outside the range of the return type, the result is undefined.
- __device__ long long int llroundf ( float x )
-
Round to nearest integer value.
Returns
Returns rounded integer value.
Description
Round x to the nearest integer value, with halfway cases rounded away from zero. If the result is outside the range of the return type, the result is undefined.
Note:This function may be slower than alternate rounding methods. See llrintf().
- __device__ float log10f ( float x )
-
Calculate the base 10 logarithm of the input argument.
Returns
- log10f( ) returns .
- log10f(1) returns +0.
- log10f(x) returns NaN for x < 0.
- log10f( ) returns .
Description
Calculate the base 10 logarithm of the input argument x.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float log1pf ( float x )
-
Calculate the value of .
Returns
- log1pf( ) returns .
- log1pf(-1) returns +0.
- log1pf(x) returns NaN for x < -1.
- log1pf( ) returns .
Description
Calculate the value of of the input argument x.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float log2f ( float x )
-
Calculate the base 2 logarithm of the input argument.
Returns
- log2f( ) returns .
- log2f(1) returns +0.
- log2f(x) returns NaN for x < 0.
- log2f( ) returns .
Description
Calculate the base 2 logarithm of the input argument x.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float logbf ( float x )
-
Calculate the floating point representation of the exponent of the input argument.
Returns
- logbf returns
- logbf returns
Description
Calculate the floating point representation of the exponent of the input argument x.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float logf ( float x )
-
Calculate the natural logarithm of the input argument.
Returns
- logf( ) returns .
- logf(1) returns +0.
- logf(x) returns NaN for x < 0.
- logf( ) returns .
Description
Calculate the natural logarithm of the input argument x.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ long int lrintf ( float x )
-
Round input to nearest integer value.
Returns
Returns rounded integer value.
Description
Round x to the nearest integer value, with halfway cases rounded towards zero. If the result is outside the range of the return type, the result is undefined.
- __device__ long int lroundf ( float x )
-
Round to nearest integer value.
Returns
Returns rounded integer value.
Description
Round x to the nearest integer value, with halfway cases rounded away from zero. If the result is outside the range of the return type, the result is undefined.
Note:This function may be slower than alternate rounding methods. See lrintf().
- __device__ float modff ( float x, float* iptr )
-
Break down the input argument into fractional and integral parts.
Returns
- modff( , iptr) returns a result with the same sign as x.
- modff( , iptr) returns and stores in the object pointed to by iptr.
- modff(NaN, iptr) stores a NaN in the object pointed to by iptr and returns a NaN.
Description
Break down the argument x into fractional and integral parts. The integral part is stored in the argument iptr. Fractional and integral parts are given the same sign as the argument x.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float nanf ( const char* tagp )
-
Returns "Not a Number" value.
Returns
- nanf(tagp) returns NaN.
Description
Return a representation of a quiet NaN. Argument tagp selects one of the possible representations.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float nearbyintf ( float x )
-
Round the input argument to the nearest integer.
Returns
- nearbyintf( ) returns .
- nearbyintf( ) returns .
Description
Round argument x to an integer value in single precision floating-point format.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float nextafterf ( float x, float y )
-
Return next representable single-precision floating-point value afer argument.
Returns
- nextafterf( , y) returns .
Description
Calculate the next representable single-precision floating-point value following x in the direction of y. For example, if y is greater than x, nextafterf() returns the smallest representable number greater than x
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float normcdff ( float y )
-
Calculate the standard normal cumulative distribution function.
Returns
- normcdff( ) returns 1
- normcdff( ) returns +0
Description
Calculate the cumulative distribution function of the standard normal distribution for input argument y, .
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float normcdfinvf ( float y )
-
Calculate the inverse of the standard normal cumulative distribution function.
Returns
- normcdfinvf(0) returns .
- normcdfinvf(1) returns .
- normcdfinvf(x) returns NaN if x is not in the interval [0,1].
Description
Calculate the inverse of the standard normal cumulative distribution function for input argument y, . The function is defined for input values in the interval .
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float powf ( float x, float y )
-
Calculate the value of first argument to the power of second argument.
Returns
- powf( , y) returns for y an integer less than 0.
- powf( , y) returns for y an odd integer greater than 0.
- powf( , y) returns +0 for y > 0 and not and odd integer.
- powf(-1, ) returns 1.
- powf(+1, y) returns 1 for any y, even a NaN.
- powf(x, ) returns 1 for any x, even a NaN.
- powf(x, y) returns a NaN for finite x < 0 and finite non-integer y.
- powf(x, ) returns for .
- powf(x, ) returns +0 for .
- powf(x, ) returns +0 for .
- powf(x, ) returns for .
- powf( , y) returns -0 for y an odd integer less than 0.
- powf( , y) returns +0 for y < 0 and not an odd integer.
- powf( , y) returns for y an odd integer greater than 0.
- powf( , y) returns for y > 0 and not an odd integer.
- powf( , y) returns +0 for y < 0.
- powf( , y) returns for y > 0.
Description
Calculate the value of x to the power of y.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float rcbrtf ( float x )
-
Calculate reciprocal cube root function.
Returns
- rcbrt( ) returns .
- rcbrt( ) returns .
Description
Calculate reciprocal cube root function of x
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float remainderf ( float x, float y )
-
Compute single-precision floating-point remainder.
Returns
- remainderf(x, 0) returns NaN.
- remainderf( , y) returns NaN.
- remainderf(x, ) returns x for finite x.
Description
Compute single-precision floating-point remainder r of dividing x by y for nonzero y. Thus . The value n is the integer value nearest . In the case when , the even n value is chosen.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float remquof ( float x, float y, int* quo )
-
Compute single-precision floating-point remainder and part of quotient.
Returns
Returns the remainder.
- remquof(x, 0, quo) returns NaN.
- remquof( , y, quo) returns NaN.
- remquof(x, , quo) returns x.
Description
Compute a double-precision floating-point remainder in the same way as the remainderf() function. Argument quo returns part of quotient upon division of x by y. Value quo has the same sign as and may not be the exact quotient but agrees with the exact quotient in the low order 3 bits.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float rintf ( float x )
-
Round input to nearest integer value in floating-point.
Returns
Returns rounded integer value.
Description
Round x to the nearest integer value in floating-point format, with halfway cases rounded towards zero.
- __device__ float roundf ( float x )
-
Round to nearest integer value in floating-point.
Returns
Returns rounded integer value.
Description
Round x to the nearest integer value in floating-point format, with halfway cases rounded away from zero.
Note:This function may be slower than alternate rounding methods. See rintf().
- __device__ float rsqrtf ( float x )
-
Calculate the reciprocal of the square root of the input argument.
Returns
Returns .
- rsqrtf( ) returns +0.
- rsqrtf( ) returns .
- rsqrtf(x) returns NaN if x is less than 0.
Description
Calculate the reciprocal of the nonnegative square root of x, .
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float scalblnf ( float x, long int n )
-
Scale floating-point input by integer power of two.
Returns
Returns x * .
- scalblnf( , n) returns .
- scalblnf(x, 0) returns x.
- scalblnf( , n) returns .
Description
Scale x by by efficient manipulation of the floating-point exponent.
- __device__ float scalbnf ( float x, int n )
-
Scale floating-point input by integer power of two.
Returns
Returns x * .
- scalbnf( , n) returns .
- scalbnf(x, 0) returns x.
- scalbnf( , n) returns .
Description
Scale x by by efficient manipulation of the floating-point exponent.
- __device__ int signbit ( float a )
-
Return the sign bit of the input.
Returns
Returns a nonzero value if and only if a is negative. Reports the sign bit of all values including infinities, zeros, and NaNs.
Description
Determine whether the floating-point value a is negative.
- __device__ void sincosf ( float x, float* sptr, float* cptr )
-
Calculate the sine and cosine of the first input argument.
Returns
- none
Description
Calculate the sine and cosine of the first input argument x (measured in radians). The results for sine and cosine are written into the second argument, sptr, and, respectively, third argument, cptr.
See also:
Note:-
For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
-
This function is affected by the --use_fast_math compiler flag. See the CUDA C Programming Guide, Appendix C, Table C-3 for a complete list of functions affected.
- __device__ void sincospif ( float x, float* sptr, float* cptr )
-
Calculate the sine and cosine of the first input argument .
Returns
- none
Description
Calculate the sine and cosine of the first input argument, x (measured in radians), . The results for sine and cosine are written into the second argument, sptr, and, respectively, third argument, cptr.
See also:
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float sinf ( float x )
-
Calculate the sine of the input argument.
Returns
- sinf( ) returns .
- sinf( ) returns NaN.
Description
Calculate the sine of the input argument x (measured in radians).
Note:-
For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
-
This function is affected by the --use_fast_math compiler flag. See the CUDA C Programming Guide, Appendix C, Table C-3 for a complete list of functions affected.
- __device__ float sinhf ( float x )
-
Calculate the hyperbolic sine of the input argument.
Returns
- sinhf( ) returns .
- sinhf( ) returns NaN.
Description
Calculate the hyperbolic sine of the input argument x.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float sinpif ( float x )
-
Calculate the sine of the input argument .
Returns
- sinpif( ) returns .
- sinpif( ) returns NaN.
Description
Calculate the sine of x (measured in radians), where x is the input argument.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float sqrtf ( float x )
-
Calculate the square root of the input argument.
Returns
Returns .
- sqrtf( ) returns .
- sqrtf( ) returns .
- sqrtf(x) returns NaN if x is less than 0.
Description
Calculate the nonnegative square root of x, .
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float tanf ( float x )
-
Calculate the tangent of the input argument.
Returns
- tanf( ) returns .
- tanf( ) returns NaN.
Description
Calculate the tangent of the input argument x (measured in radians).
Note:-
For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
-
This function is affected by the --use_fast_math compiler flag. See the CUDA C Programming Guide, Appendix C, Table C-3 for a complete list of functions affected.
- __device__ float tanhf ( float x )
-
Calculate the hyperbolic tangent of the input argument.
Returns
- tanhf( ) returns .
Description
Calculate the hyperbolic tangent of the input argument x.
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float tgammaf ( float x )
-
Calculate the gamma function of the input argument.
Returns
- tgammaf( ) returns .
- tgammaf(2) returns +0.
- tgammaf(x) returns if the correctly calculated value is outside the single floating point range.
- tgammaf(x) returns NaN if x < 0.
- tgammaf( ) returns NaN.
- tgammaf( ) returns .
Description
Calculate the gamma function of the input argument x, namely the value of .
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float truncf ( float x )
-
Truncate input argument to the integral part.
Returns
Returns truncated integer value.
Description
Round x to the nearest integer value that does not exceed x in magnitude.
- __device__ float y0f ( float x )
-
Calculate the value of the Bessel function of the second kind of order 0 for the input argument.
Returns
Returns the value of the Bessel function of the second kind of order 0.
- y0f(0) returns .
- y0f(x) returns NaN for x < 0.
- y0f( ) returns +0.
- y0f(NaN) returns NaN.
Description
Calculate the value of the Bessel function of the second kind of order 0 for the input argument x, .
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float y1f ( float x )
-
Calculate the value of the Bessel function of the second kind of order 1 for the input argument.
Returns
Returns the value of the Bessel function of the second kind of order 1.
- y1f(0) returns .
- y1f(x) returns NaN for x < 0.
- y1f( ) returns +0.
- y1f(NaN) returns NaN.
Description
Calculate the value of the Bessel function of the second kind of order 1 for the input argument x, .
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.
- __device__ float ynf ( int n, float x )
-
Calculate the value of the Bessel function of the second kind of order n for the input argument.
Returns
Returns the value of the Bessel function of the second kind of order n.
- ynf(n, x) returns NaN for n < 0.
- ynf(n, 0) returns .
- ynf(n, x) returns NaN for x < 0.
- ynf(n, ) returns +0.
- ynf(n, NaN) returns NaN.
Description
Calculate the value of the Bessel function of the second kind of order n for the input argument x, .
Note:For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.