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       isless - Compare of x < y.

       int isless(float x, float y);

       intn isless(floatn x, floatn y);

       int isless(double x, double y);

       longn isless(doublen x, doublen y);

       int isless (half x, half y)   // if
       half extension enabled
       shortn isless (halfn x, halfn y)   //
       if half extension enabled


       Returns the component-wise compare of x < y.


       If an implementation extends this specification to support IEEE-754
       flags or exceptions, then all built-in relational functions shall
       proceed without raising the invalid floating-point exception when one
       or more of the operands are NaNs.

       The built-in relational functions are extended with cl_khr_fp16(3clc)
       to include appropriate versions of functions that take half, and
       half{2|3|4|8|16} as arguments and return values.

       The function returns a 0 if the specified relation is false and a 1 if
       the specified relation is true for scalar argument types. These
       functions shall return a 0 if the specified relation is false and a - 1
       (i.e. all bits set) if the specified relation is true for vector
       argument types.

       The relational functions isequal, isgreater, isgreaterequal, isless,
       islessequal, and islessgreater always return 0 if either argument is
       not a number (NaN).  isnotequal returns 1 if one or both arguments are
       not a number (NaN) and the argument type is a scalar and returns -1 if
       one or both arguments are not a number (NaN) and the argument type is a


       OpenCL Specification[1]




       The Khronos Group


       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.


        1. OpenCL Specification
           page 264, section 6.12.6 - Relational Functions

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