nextafter
Computes the element-wise next representable floating-point value of vector
a
elements in the direction of vector b
elements.Description
The
nextafter(a,b)
function returns a vector containing the next
representable floating-point values following the first vector
argument elements in the direction of the second vector argument’s
corresponding elements.Arguments/Results | Error Code |
---|---|
Input vector argument element is finite and the corresponding result vector element value is infinite | status::overflow |
Result vector element value is subnormal or zero, and different from the corresponding input vector argument element | status::underflow |
Even though underflow or overflow can occur, the returned value is
independent of the current rounding direction mode.
API
Syntax
Buffer API
namespace oneapi::mkl::vm {
sycl::event nextafter(sycl::queue & exec_queue,
std::int64_t n,
sycl::buffer<T> & a,
sycl::buffer<T> & b,
sycl::buffer<T> & y,
oneapi::mkl::vm::mode mode = oneapi::mkl::vm::mode::not_defined,
oneapi::mkl::vm::error_handler<T> errhandler = {});
}
namespace oneapi::mkl::vm {
sycl::event nextafter(sycl::queue & exec_queue,
sycl::buffer<T> & a,
oneapi::mkl::slice sa,
sycl::buffer<T> & b,
oneapi::mkl::slice sb,
sycl::buffer<T> & y,
oneapi::mkl::slice sy,
oneapi::mkl::vm::mode mode = oneapi::mkl::vm::mode::not_defined,
oneapi::mkl::vm::error_handler<T> errhandler = {});
}
USM API
namespace oneapi::mkl::vm {
sycl::event nextafter(sycl::queue & exec_queue,
std::int64_t n,
T const * a,
T const * b,
T * y,
std::vector<cl::sycl::event> const & depends = {},
oneapi::mkl::vm::mode mode = oneapi::mkl::vm::mode::not_defined,
oneapi::mkl::vm::error_handler<T> errhandler = {});
}
namespace oneapi::mkl::vm {
sycl::event nextafter(sycl::queue & exec_queue,
T const * a,
oneapi::mkl::slice sa,
T const * b,
oneapi::mkl::slice sb,
T * y,
oneapi::mkl::slice sy,
std::vector<cl::sycl::event> const & depends = {},
oneapi::mkl::vm::mode mode = oneapi::mkl::vm::mode::not_defined,
oneapi::mkl::vm::error_handler<T> errhandler = {});
}
nextafter
supports the following precisions and devices:T | Devices supported |
---|---|
float | Host, CPU, and GPU |
double | Host, CPU, and GPU |
Input Parameters
Buffer API
- exec_queue
- The queue where the routine should be executed.
- n
- Specifies the number of elements to be calculated.
- a
- The buffer containing the 1st input vector.
- sa
- Slice selector fora. See Data Types for a description of the oneMKL slice type.
- b
- The buffer containing the 2nd input vector.
- sb
- Slice selector forb. See Data Types for a description of the oneMKL slice type.
- sy
- Slice selector fory. See Data Types for a description of the oneMKL slice type.
- mode
- Overrides the global VM mode setting for this function call. See set_mode function for possible values and their description. This is an optional parameter. The default value ismode::not_defined.
- errhandler
- Sets local error handling mode for this function call. See the create_error_handler function for arguments and their descriptions. This is an optional parameter. The local error handler is disabled by default.
USM API
- exec_queue
- The queue where the routine should be executed.
- n
- Specifies the number of elements to be calculated.
- a
- Pointer to the 1st input vector.
- sa
- Slice selector fora. See Data Types for a description of the oneMKL slice type.
- b
- Pointer to the 2nd input vector.
- sb
- Slice selector forb. See Data Types for a description of the oneMKL slice type.
- sy
- Slice selector fory. See Data Types for a description of the oneMKL slice type.
- depends
- Vector of dependent events (to wait for input data to be ready). This is an optional parameter. The default is an empty vector.
- mode
- Overrides the global VM mode setting for this function call. See the set_mode function for possible values and their description. This is an optional parameter. The default value ismode::not_defined.
- errhandler
- Sets local error handling mode for this function call. See the create_error_handler function for arguments and their descriptions. This is an optional parameter. The local error handler is disabled by default.
Output Parameters
Buffer API
- y
- The buffer containing the output vector.
- return value (event)
- Computation end event.
USM API
- y
- Pointer to the output vector.
- return value (event)
- Computation end event.
Examples
An example of how to use
nextafter
can be found in the oneMKL
installation directory, under:examples/dpcpp/vml/source/vnextafter.cpp