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opencl-1.2-man-doc_1.0~svn27110-1_all **NAME**

acos,_acosh,_acospi - Arc cosine functions.
**gentype** **acos(gentype** **);**
**gentype** **acosh(gentype** **);**
**gentype** **acospi(gentype** __x__**);**

**DESCRIPTION**

**acos** is the arc cosine function.
**acosh** is the inverse hyperbolic cosine function.
**acospi** computes **acos** (__x__) / π.

**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