ormtr_scratchpad_size

Computes size of scratchpad memory required for ormtr (USM Version) function. This routine belongs to the oneapi::mkl::lapacknamespace.

Syntax

template<typename T>
std::int64_t ormtr_scratchpad_size(cl::sycl::queue &queue, mkl::side side, mkl::uplo uplo, mkl::transpose trans, std::int64_t m, std::int64_t n, std::int64_t lda, std::int64_t ldc)

Description

Computes the number of elements of type T the scratchpad memory to be passed to the ormtr (buffer or USM version) function should be able to hold.

Input Parameters

In the descriptions below, r denotes the order of Q:

r = m

if side = side::left

r = n

if side = side::right

queue

Device queue where calculations by the ormtr (buffer or USM version) function will be performed.

side

Must be either side::left or side::right.

If side = side::left, Q or QT is applied to C from the left.

If side = side::right, Q or QT is applied to C from the right.

uplo

Must be either uplo::upper or uplo::lower. Uses the same uplo as supplied to sytrd (USM Version).

trans

Must be either transpose::nontrans or transpose::trans.

If trans = transpose::nontrans, the routine multiplies C by Q.

If trans = transpose::trans, the routine multiplies C by QT.

m

The number of rows in the matrix C(m 0).

n

The number of columns in the matrix C(n 0).

lda

The leading dimension of a(max(1, r) lda).

ldc

The leading dimension of c(max(1, n) ldc).

Exceptions

mkl::lapack::exception

This exception is thrown when an incorrect argument value is supplied. You can determine the position of the incorrect argument by the info() method of the exception object.

Return Values

The number of elements of type T the scratchpad memory to be passed to the ormtr (buffer or USM version) function should be able to hold.