?gemm_pack_get_size, gemm_*_pack_get

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

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ID 766686

Date 10/31/2024

Version

Public

Visible to Intel only — GUID: GUID-8F12581B-B0ED-49F5-8061-B84AD89F39C4

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?gemm_pack_get_size, gemm_*_pack_get_size

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

Syntax

dest = sgemm_pack_get_size (identifier, m, n, k)

dest = dgemm_pack_get_size (identifier, m, n, k)

dest = gemm_s8u8s32_pack_get_size (identifier, m, n, k)

dest = gemm_s16s16s32_pack_get_size (identifier, m, n, k)

Include Files

mkl.fi

Description

The ?gemm_pack_get_size and gemm_*_pack_get_size routines belong to a set of related routines that enable the use of an internal packed storage. Call the ?gemm_pack_get_size and 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	CHARACTER*1.	Specifies which matrix is to be packed: If identifier = `'A'` or `'a'`, the size returned is the size required to store matrix `A` in an internal format. If identifier = `'B'` or `'b'`, the size returned is the size required to store matrix `B` in an internal format.
m	INTEGER.	Specifies the number of rows of matrix op(`A`) and of the matrix `C`. The value of m must be at least zero.
n	INTEGER.	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	INTEGER.	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	INTEGER.	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:

sgemm_pack_get_size: examples\blas\source\sgemm_computex.f

dgemm_pack_get_size: examples\blas\source\dgemm_computex.f

gemm_s8u8s32_pack_get_size: examples\blas\source\gemm_s8u8s32_computex.f

gemm_s16s16s32_pack_get_size: examples\blas\source\gemm_s16s16s32_computex.f

Parent topic: BLAS-like Extensions

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