NAME

       lgamma,_lgamma_r - Log gamma functions.

       gentype lgamma(gentype x);

       floatn lgamma_r(floatn x, __global intn *signp);

       floatn lgamma_r(floatn x, __local intn *signp);

       floatn lgamma_r(floatn x, __private intn *signp);

       float lgamma_r(float x, __global int *signp);

       float lgamma_r(float x, __local int *signp);

       float lgamma_r(float x, __private int *signp);

       doublen lgamma_r(doublen x, __global intn *signp);

       doublen lgamma_r(doublen x, __local intn *signp);

       doublen lgamma_r(doublen x, __private intn *signp);

       double lgamma_r(double x, __global int *signp);

       double lgamma_r(double x, __local int *signp);

       double lgamma_r(double x, __private int *signp);

       halfn lgamma_r(halfn x, __global intn *signp);

       halfn lgamma_r(halfn x, __local intn *signp);

       halfn lgamma_r(halfn x, __private intn *signp);

       half lgamma_r(half x, __global int *signp);

       half lgamma_r(half x, __local int *signp);

       half lgamma_r(half x, __private int *signp);

DESCRIPTION

       Returns the natural logarithm of the absolute value of the gamma function. The sign of the
       gamma function is returned in the signp argument of the lgamma_r.

       An application that wants to use half and halfn types will need to include the #pragma
       OPENCL EXTENSION cl_khr_fp16(3clc) : enable directive. If extended with cl_khr_fp16(3clc),
       generic type name gentype also includes half and half{2|3|4|8|16}.

NOTES

       The vector versions of the math functions operate component-wise. The description is
       per-component.

       The built-in math functions are not affected by the prevailing rounding mode in the
       calling environment, and always return the same value as they would if called with the
       round to nearest even rounding mode.

       The built-in math functions take scalar or vector arguments. For any specific use of these
       function, the actual type has to be the same for all arguments and the return type unless
       otherwise specified.

       The generic type name gentype is used to indicate that the function can take float,
       float2, float3, float4, float8, float16, double, double2, double3, double4, double8, or
       double16 as the type for the arguments.

       If extended with cl_khr_fp16(3clc), generic type name gentype may indicate half and
       half{2|3|4|8|16} as arguments and return values.

       The generic type name gentypef is used to indicate that the function can take float,
       float2, float3, float4, float8, or float16 as the type for the arguments.

       The generic type name gentyped is used to indicate that the function can take double,
       double2, double3, double4, double8, or double16 as the type for the arguments.

SPECIFICATION

       OpenCL Specification[1]

SEE ALSO

       mathFunctions(3clc)

AUTHORS

       The Khronos Group

COPYRIGHT

       Copyright © 2007-2011 The Khronos Group Inc.
       Permission is hereby granted, free of charge, to any person obtaining a copy of this
       software and/or associated documentation files (the "Materials"), to deal in the Materials
       without restriction, including without limitation the rights to use, copy, modify, merge,
       publish, distribute, sublicense, and/or sell copies of the Materials, and to permit
       persons to whom the Materials are furnished to do so, subject to the condition that this
       copyright notice and permission notice shall be included in all copies or substantial
       portions of the Materials.

NOTES

        1. OpenCL Specification
           page 244, section 6.12.2 - Math Functions