# Relational Built-In Functions

Click an item in the table below for details about that function.

 isequal Compare of `x` == `y`. isnotequal Compare of `x` != `y`. isgreater Compare of `x` > `y`. isgreaterequal Compare of `x` >= `y`. isless Compare of `x` < `y`. islessequal Compare of `x` <= `y`. islessgreater Compare of (`x` < `y`) || (`x` > `y`). isfinite Test for finite value. isinf Test for +ve or -ve infinity. isnan Test for a NaN. isnormal Test for a normal value. isordered Test if arguments are ordered. isunordered Test if arguments are unordered. signbit Test for sign bit. any 1 if MSB in any component of `x` is set; else 0. all 1 if MSB in all components of `x` is set; else 0. bitselect Each bit of result is corresponding bit of `a` if corresponding bit of `c` is 0. select For each component of a vector type, result[`i`] = if MSB of `c`[`i`] is set ? `b`[`i`] : `a`[`i`] For scalar type, result = `c` ? `b` : `a`.

## Description

The relational and equality operators (<, <=, >, >=, !=, ==) can be used with scalar and vector built-in types and produce a scalar or vector signed integer result respectively.

The built-in relational functions can be used with built-in scalar or vector types as arguments and return a scalar or vector integer result. If an implementation extends this specification to support IEEE-754 flags or exceptions, then all built-in Relational 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_fp64 to include appropriate versions of functions that take double, and double{2|3|4|8|16} as arguments and return values. They are also extended with cl_khr_fp16 to include appropriate versions of functions that take half, and half{2|3|4|8|16} as arguments and return values. The relational and equality operators (<, <=, >, >=, !=, ==) can be used with double`n` vector types and shall produce a vector long`n` result.

## Specification

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