Tangent functions.
gentype atan(gentype y_over_x)
gentype atan2(gentype y,
gentype x)
gentype atanh(gentype)
gentype atanpi(gentype x)
gentype atan2pi(gentype y,
gentype x)
Description
atan
is the arc tangent function.
atan2
is the arc tangent of y
/ x
.
atanh
is the hyperbolic arc tangent function.
atanpi
computes atan
(x
) / π.
atan2pi
computes atan2
(y
, x
) / π.
Notes
General information about builtin math functions: The builtin math functions are categorized into the following:

A list of builtin functions that have scalar or vector argument versions, and,

A list of builtin functions that only take scalar float arguments.
The vector versions of the math functions operate componentwise. The description is percomponent.
The builtin 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 builtin 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
, generic type name gentype
may indicate half
and half{234816}
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.