?gemm_pack_get_size , gemm_*_pack_get

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 10/15/2026

Version

Public

?gemm_pack_get_size , gemm_*_pack_get_size

Returns the number of bytes required to store the packed matrix.

Syntax

size_t cblas_hgemm_pack_get_size(const CBLAS_IDENTIFIER identifier, const MKL_INT m,
                                 const MKL_INT n, const MKL_INT k)

size_t cblas_sgemm_pack_get_size(const CBLAS_IDENTIFIER identifier, const MKL_INT m,
                                 const MKL_INT n, const MKL_INT k)

size_t cblas_dgemm_pack_get_size(const CBLAS_IDENTIFIER identifier, const MKL_INT m,
                                 const MKL_INT n, const MKL_INT k)

size_t cblas_gemm_s8u8s32_pack_get_size(const CBLAS_IDENTIFIER identifier, const MKL_INT m,
                                        const MKL_INT n, const MKL_INT k)

size_t cblas_gemm_s16s16s32_pack_get_size(const CBLAS_IDENTIFIER identifier, const MKL_INT m,
                                          const MKL_INT n, const MKL_INT k)

size_t cblas_gemm_bf16bf16f32_pack_get_size(const CBLAS_IDENTIFIER identifier, const MKL_INT m,
                                            const MKL_INT n, const MKL_INT k)

size_t cblas_gemm_f16f16f32_pack_get_size(const CBLAS_IDENTIFIER identifier, const MKL_INT m,
                                          const MKL_INT n, const MKL_INT k)

size_t cblas_gemm_e5m2e5m2f32_pack_get_size(const CBLAS_IDENTIFIER identifier, const MKL_INT m,
                                            const MKL_INT n, const MKL_INT k)

size_t cblas_gemm_e4m3e4m3f32_pack_get_size(const CBLAS_IDENTIFIER identifier, const MKL_INT m,
                                            const MKL_INT n, const MKL_INT k)

Include Files

mkl.h

Description

The cblas_?gemm_pack_get_size and cblas_gemm_*_pack_get_size routines belong to a set of related routines that enable the use of an internal packed storage. Call the cblas_?gemm_pack_get_size and cblas_gemm_*_pack_get_size routines first to query the size of storage required for a packed matrix structure to be used in subsequent calls.

Ultimately, the packed matrix structure is used to compute \(C \leftarrow \alpha \cdot op(A)\cdot op(B) + \beta\cdot C\) for bfloat16, half, single and double precision or \(C \leftarrow \alpha (op(A)+ A_offset)\cdot(op(B)+ B_offset) + \beta*C + C_offset\) for integer type.

where: \(op(X)\) is one of the operations \(op(X) = X\) or \(op(X) = X^{T}\), \(\alpha\) and \(\beta\) are scalars, \(A\), \(A_{\text{offset}}\) , \(B\) , \(B_{\text{offset}}\) , \(C\) , and \(C_{\text{offset}}\) are matrices. \(op(A)\) is an \(m\) -by- \(k\) matrix, \(op(B)\) is a \(k\) -by- \(n\) matrix and \(C\) is an \(m\) -by- \(n\) matrix. A_{text{offset}} is an \(m\) -by- \(k\) matrix. \(B_{\text{offset}}\) is an \(k\) -by- \(n\) matrix. \(C_{\text{offset}}\) is an \(m\) -by- \(n\) matrix.

Input Parameters

Parameter	Type	Description
`identifier`	`CBLAS_IDENTIFIER`	Specifies which matrix is to be packed: If `identifier` = `'A'` or `'a'` CblasAMatrix , the size returned is the size required to store matrix `A` in an internal format. If `identifier` = `'B'` or `'b'` CblasBMatrix , the size returned is the size required to store matrix `B` in an internal format.
`m`	`MKL_INT`	Specifies the number of rows of matrix op( `A` ) and of the matrix `C` . The value of `m` must be at least zero.
`n`	`MKL_INT`	Specifies the number of columns of matrix op( `B` ) and the number of columns of matrix `C` . The value of `n` must be at least zero.
`k`	`MKL_INT`	Specifies the number of columns of matrix op( `A` ) and the number of rows of matrix op( `B` ). The value of `k` must be at least zero.

Return Values

Parameter	Type	Description
`size`	`size_t`	Returns the size (in bytes) required to store the matrix when packed into the internal format of Intel® oneAPI Math Kernel Library (oneMKL) .

NOTE:

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