mkl_jit_create

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

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ID 766686

Date 3/31/2023

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mkl_jit_create_?gemm

Create a GEMM kernel that computes a scalar-matrix-matrix product and adds the result to a scalar-matrix product.

Syntax

status = mkl_jit_create_sgemm(jitter, transa, transb, m, n, k, alpha, lda, ldb, beta, ldc)

status = mkl_jit_create_dgemm(jitter, transa, transb, m, n, k, alpha, lda, ldb, beta, ldc)

status = mkl_jit_create_cgemm(jitter, transa, transb, m, n, k, alpha, lda, ldb, beta, ldc)

status = mkl_jit_create_zgemm(jitter, transa, transb, m, n, k, alpha, lda, ldb, beta, ldc)

Include Files

mkl_blas.f90

Description

The mkl_jit_create_?gemm functions belong to a set of related routines that enable use of just-in-time code generation.

The mkl_jit_create_?gemm functions create a handle to a just-in-time code generator (a jitter) and generate a GEMM kernel that computes a scalar-matrix-matrix product and adds the result to a scalar-matrix product, with general matrices. The operation of the generated GEMM kernel is defined as follows:

C := alpha*op(A)*op(B) + beta*C

Where:

op(X) is either op(X) = X or op(X) = X^T or op(X) = X^H
alpha and beta are scalars
A, B, and C 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

NOTE:

Generating a new kernel with mkl_jit_create_?gemm involves moderate runtime overhead. To benefit from JIT code generation, use this feature when you need to call the generated kernel many times (for example, several hundred calls).

NOTE:

The JIT API requires Fortran 90 and the ISO_C_BINDING module.

Input Parameters

transa

CHARACTER*1.

Specifies the form of op(A) used in the generated matrix multiplication:

if transa = 'N', then op(A) = A
if transa = 'T', then op(A) = A^T
if transa = 'C', then op(A) = A^H

transb

CHARACTER*1.

Specifies the form of op(B) used in the generated matrix multiplication:

if transb = 'N', then op(B) = B
if transb = 'T', then op(B) = B^T
if transb = 'C', then op(B) = B^H

m

INTEGER.

Specifies the number of rows of the 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 the matrix op(B) and of the matrix C. The value of n must be at least zero.

k

INTEGER.

Specifies the number of columns of the matrix op(A) and the number of rows of the matrix op(B). The value of k must be at least zero.

alpha

REAL for mkl_jit_create_sgemm

DOUBLE PRECISION for mkl_jit_create_dgemm.

COMPLEX for mkl_jit_create_cgemm

DOUBLE COMPLEX for mkl_jit_create_zgemm

Specifies the scalar alpha.

lda

INTEGER.

Specifies the leading dimension of a.

If transa = 'N'lda must be at least max(1,m).
If transa = 'T' or transa = 'C', lda must be at least max(1,k).

ldb

INTEGER.

Specifies the leading dimension of b:

If transb = 'N'ldb must be at least max(1,k).
If transb = 'T' or transb = 'C', ldb must be at least max(1,n).

beta

REAL for mkl_jit_create_sgemm

DOUBLE PRECISION for mkl_jit_create_dgemm.

COMPLEX for mkl_jit_create_cgemm

DOUBLE COMPLEX for mkl_jit_create_zgemm

Specifies the scalar beta.

ldc

INTEGER.

Specifies the leading dimension of c which must be at least max(1,m).

Output Parameters

jitter

TYPE(C_PTR). C pointer to a handle to the newly created code generator.

Return Values

status

INTEGER

Returns one of the following:

MKL_JIT_ERROR if the handle cannot be created (no memory)

—or—
MKL_JIT_SUCCESS if the jitter has been created and the GEMM kernel was successfully created

—or—
MKL_NO_JIT if the jitter has been created, but a JIT GEMM kernel was not created because JIT is not beneficial for the given input parameters. The function pointer returned by mkl_jit_get_?gemm_ptr will call standard (non-JIT) GEMM.

Parent topic: BLAS-like Extensions

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mkl_jit_create_?gemm