ungbr_scratchpad

Intel® oneAPI Math Kernel Library (oneMKL) - Data Parallel C++ Developer Reference

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ID 772045

Date 12/16/2022

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ungbr_scratchpad_size

Computes size of scratchpad memory required for ungbr (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 ungbr (buffer or USM version) function must be able to hold.

API

Syntax

namespace oneapi::mkl::lapack {
  template<typename T>
  std::int64_t ungbr_scratchpad_size(sycl::queue &queue,
  mkl::generate gen,
  std::int64_t m,
  std::int64_t n,
  std::int64_t k,
  std::int64_t lda)
}

Input Parameters

queue

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

gen

Must be generate::q or generate::p.

If gen= generate::q, the routine generates the matrix Q.

If gen= generate::p, the routine generates the matrix P^T.

m

The number of rows in the matrix Q or P^T to be returned (0 ≤ m).

If gen= generate::q, m ≥ n ≥ min(m, k).

If gen= generate::p, n ≥ m ≥ min(n, k).

n

The number of rows in the matrix Q or P^T to be returned (0 ≤ n). See m for constraints.

k

If gen= generate::q, the number of columns in the original m-by-k matrix reduced by gebrd (USM Version).

If gen= generate::p, the number of rows in the original k-by-n matrix reduced by gebrd (USM Version).

lda

The leading dimension of a.

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 ungbr (buffer or USM version) function must be able to hold.

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