Visible to Intel only — GUID: GUID-032F3F14-0681-42F1-BD97-E81AAEDFF312
Visible to Intel only — GUID: GUID-032F3F14-0681-42F1-BD97-E81AAEDFF312
?axpy_batch
Computes a group of vector-scalar products added to a vector.
Syntax
call saxpy_batch(n_array, alpha_array, x_array, incx_array, y_array, incy_array, group_count, group_size_array)
call daxpy_batch(n_array, alpha_array, x_array, incx_array, y_array, incy_array, group_count, group_size_array)
call caxpy_batch(n_array, alpha_array, x_array, incx_array, y_array, incy_array, group_count, group_size_array)
call zaxpy_batch(n_array, alpha_array, x_array, incx_array, y_array, incy_array, group_count, group_size_array)
Description
The ?axpy_batch routines perform a series of scalar-vector product added to a vector. They are similar to the ?axpy routine counterparts, but the ?axpy_batch routines perform vector operations with a group of vectors. The groups contain vectors with the same parameters.
The operation is defined as
idx = 0 for i = 0 … group_count – 1 n, alpha, incx, incy and group_size at position i in n_array, alpha_array, incx_array, incy_array and group_size_array for j = 0 … group_size – 1 x and y are vectors of size n at position idx in x_array and y_array y := alpha * x + y idx := idx + 1 end for end for
The number of entries in x_array, and y_array is total_batch_count = the sum of all of the group_size entries.
Input Parameters
- n_array
-
INTEGER. Array of size group_count. For the group i, ni = n_array[i] is the number of elements in vectors x and y.
- alpha_array
-
REAL for saxpy_batch
DOUBLE PRECISION for daxpy_batch
COMPLEX for caxpy_batch
DOUBLE COMPLEX for zaxpy_batch
Array of size group_count. For the group i, alphai = alpha_array[i] is the scalar alpha.
- x_array
-
INTEGER*8 for Intel® 64 architecture
INTEGER*4 for IA-32 architecture
Array of size total_batch_count of pointers used to store x vectors. The array allocated for the x vectors of the group i must be of size at least (1 + (ni – 1)*abs(incxi)).
- incx_array
-
INTEGER. Array of size group_count. For the group i, incxi = incx_array[i] is the stride of vector x.
- y_array
-
INTEGER*8 for Intel® 64 architecture
INTEGER*4 for IA-32 architecture
Array of size total_batch_count of pointers used to store y vectors. The array allocated for the y vectors of the group i must be of size at least (1 + (ni – 1)*abs(incyi)).
- incy_array
-
INTEGER. Array of size group_count. For the group i, incyi = incy_array[i] is the stride of vector y.
- group_count
-
INTEGER. Number of groups. Must be at least 0.
- group_size_array
-
INTEGER. Array of size group_count. The element group_size_array[i] is the number of vector in the group i. Each element in group_size_array must be at least 0.
Output Parameters
- y_array
-
Array of pointers holding the total_batch_count updated vector y.