cblas_?gemm_pack_get_size, cblas_gemm_*_pack_get

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 7/13/2023

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cblas_?gemm_pack_get_size, cblas_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)

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 := alpha*op(A)*op(B) + beta*C for bfloat16, half, single and double precision or

C := alpha*(op(A)+ A_offset)*(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_offset,B, B_offset,C, and C_offset are matrices
op(A) is an m-by-k matrix,
op(B) is a k-by-n matrix,
C is an m-by-n matrix.
A_offset is an m-by-k matrix.
B_offset is an k-by-n matrix.
C_offset is an m-by-n matrix.

Input Parameters

Parameter	Type	Description
identifier	CBLAS_IDENTIFIER	Specifies which matrix is to be packed: If identifier = CblasAMatrix, the size returned is the size required to store matrix `A` in an internal format. If identifier = 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).

Example

See the following examples in the MKL installation directory to understand the use of these routines:

cblas_hgemm_pack_get_size: examples\cblas\source\cblas_hgemm_computex.c

cblas_sgemm_pack_get_size: examples\cblas\source\cblas_sgemm_computex.c

cblas_dgemm_pack_get_size: examples\cblas\source\cblas_dgemm_computex.c

cblas_gemm_s8u8s32_pack_get_size: examples\cblas\source\cblas_gemm_s8u8s32_computex.c

cblas_gemm_s16u16s32_pack_get_size: examples\cblas\source\cblas_gemm_s16s16s32_computex.c

cblas_gemm_bf16bf16f32_pack_get_size: examples\cblas\source\cblas_gemm_bf16bf16f32_computex.c

Parent topic: BLAS-like Extensions

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