gentype
log
(
| gentype ) |
gentype
log2
(
| gentype ) |
gentype
log10
(
| gentype ) |
gentype
log1p
(
| gentype x) |
gentype
logb
(
| gentype x) |
gentype
half_log
(
| gentype x) |
gentype
half_log2
(
| gentype x) |
gentype
half_log10
(
| gentype x) |
gentype
native_log
(
| gentype x) |
gentype
native_log2
(
| gentype x) |
gentype
native_log10
(
| gentype x) |
log
computes natural logarithm.
log2
computes a base 2 logarithm.
log10
computes a base 10 logarithm.
log1p
computes loge(1.0 + x
).
logb
computes the exponent of x
, which is
the integral part of logr |x
|.
half_log
computes natural logarithm.
half_log2
computes a base 2 logarithm.
half_log10
computes a base 10 logarithm.
native_log
computes natural logarithm over an implementation-defined
range. The maximum error is implementation-defined.
native_log2
computes a base 2 logarithm over an
implementation-defined range. The maximum error is implementation-defined.
native_log10
computes a base 10 logarithm over an
implementation-defined range. The maximum error is implementation-defined.
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, 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.
Functions with the half_
prefix are implemented with a minimum
of 10-bits of accuracy i.e. an ULP value less than or equal to 8192 ulp.
Functions with the native__
prefix may map to one or more
native device instructions and will typically have better performance compared to the
corresponding functions (without the native__
prefix). The accuracy
(and in some cases the input range(s)) of these functions is implementation-defined.