Performs element by element multiplication of vector a and vector b.
Buffer API:
void mul(queue& exec_queue, int64_t n, buffer<T,1>& a, buffer<T,1>& b, buffer<T,1>& y, uint64_t mode = mode::not_defined, error_handler<T> errhandler = {} );
USM API:
event mul(queue& exec_queue, int64_t n, T* a, T* b, T* y, vector_class<event>* depends, uint64_t mode = mode::not_defined, error_handler<T> errhandler = {} );
mul supports the following precisions and devices:
T | Devices supported |
---|---|
float | Host, CPU, and GPU |
double | Host, CPU, and GPU |
std::complex<float> | Host, CPU, and GPU |
std::complex<double> | Host, CPU, and GPU |
The mul(a, b) function performs element by element multiplication of vector a and vector b.
Argument 1 | Argument 2 | Result | Error Code |
---|---|---|---|
+0 | +0 | +0 | |
+0 | -0 | -0 | |
-0 | +0 | -0 | |
-0 | -0 | +0 | |
+0 | +∞ | QNAN | |
+0 | -∞ | QNAN | |
-0 | +∞ | QNAN | |
-0 | -∞ | QNAN | |
+∞ | +0 | QNAN | |
+∞ | -0 | QNAN | |
-∞ | +0 | QNAN | |
-∞ | -0 | QNAN | |
+∞ | +∞ | +∞ | |
+∞ | -∞ | -∞ | |
-∞ | +∞ | -∞ | |
-∞ | -∞ | +∞ | |
SNAN | any value | QNAN | |
any value | SNAN | QNAN | |
QNAN | non-SNAN | QNAN | |
non-SNAN | QNAN | QNAN |
Specifications for special values of the complex functions are defined according to the following formula
mul(x1+i*y1,x2+i*y2) = (x1*x2-y1*y2) + i*(x1*y2+y1*x2)
Overflow in a complex function occurs (supported in the HA/LA accuracy modes only) when all RE(x), RE(y), IM(x), IM(y) arguments are finite numbers, but the real or imaginary part of the computed result is so large that it does not fit the target precision. In this case, the function returns ∞ in that part of the result, and sets the VM Error Status to status::overflow (overriding any possible status::accuracy_warning status).
Buffer API:
The queue where the routine should be executed.
Specifies the number of elements to be calculated.
The buffer a containing 1st input vector of size n.
The buffer b containing 2nd input vector of size n.
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 is mode::not_defined.
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:
The queue where the routine should be executed.
Specifies the number of elements to be calculated.
Pointer a to the 1st input vector of size n.
Pointer b to the 2nd input vector of size n.
Vector of dependent events (to wait for input data to be ready).
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.
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.
Buffer API:
The buffer y containing the output vector of size n.
USM API:
Pointer y to the output vector of size n.
Function end event.
An example of how to use mulcan be found in the Intel® oneMKL installation directory, under:
examples/sycl/vml/vmul.cpp