A newer version of this document is available. Customers should click here to go to the newest version.
Visible to Intel only — GUID: GUID-8B1C334B-C1FE-4AFB-AFE9-9B60FA50923A
Visible to Intel only — GUID: GUID-8B1C334B-C1FE-4AFB-AFE9-9B60FA50923A
fdim
Computes the element-wise positive difference between vector a elements and vector b elements.
Description
The fdim(a,b) function returns a vector containing the differences of the corresponding elements of the first and second vector arguments if the first element is larger, and +0 otherwise.
Argument 1 |
Argument 2 |
Result |
Error Code |
|---|---|---|---|
any |
QNAN |
QNAN |
|
any |
SNAN |
QNAN |
|
QNAN |
any |
QNAN |
|
SNAN |
any |
QNAN |
The fdim(a,b) function does not generate any errors.
API
Syntax
Buffer API
namespace oneapi::mkl::vm {
sycl::event fdim(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);
}namespace oneapi::mkl::vm {
sycl::event fdim(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);
}USM API
namespace oneapi::mkl::vm {
sycl::event fdim(sycl::queue & exec_queue,
std::int64_t n,
T const * a,
T const * b,
T * y,
std::vector<sycl::event> const & depends = {},
oneapi::mkl::vm::mode mode = oneapi::mkl::vm::mode::not_defined);
}namespace oneapi::mkl::vm {
sycl::event fdim(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<sycl::event> const & depends = {},
oneapi::mkl::vm::mode mode = oneapi::mkl::vm::mode::not_defined);
}fdim supports the following precisions and devices:
T |
Devices supported |
|---|---|
float |
CPU and GPU |
double |
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 for a. See Data Types for a description of the oneMKL slice type.
- b
-
The buffer containing the 2nd input vector.
- sb
-
Slice selector for b. See Data Types for a description of the oneMKL slice type.
- sy
-
Slice selector for y. See Data Types for a description of the oneMKL slice type.
- 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 is mode::not_defined.
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 for a. See Data Types for a description of the oneMKL slice type.
- b
-
Pointer to the 2nd input vector.
- sb
-
Slice selector for b. See Data Types for a description of the oneMKL slice type.
- sy
-
Slice selector for y. 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 is mode::not_defined.
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 fdim can be found in the oneMKL installation directory, under:
share/doc/mkl/examples/sycl/vml/source/vfdim.cpp