ormtr_scratchpad

oneMKL - Data Parallel C++ Developer Reference

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ID 772045

Date 3/31/2021

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ormtr_scratchpad_size

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

Description
API

Description

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

API

Syntax

namespace oneapi::mkl::lapack {
  template<typename T>
  std::int64_t ormtr_scratchpad_size(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)
}

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 Q^T is applied to C from the left.

If side = side::right, Q or Q^T 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 Q^T.

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(lda ≥ max(1, r)).

ldc

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

Exceptions

Exception	Description
`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 must be able to hold.

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oneMKL - Data Parallel C++ Developer Reference

ormtr_scratchpad_size

Description

API