Usage Examples for CNR Support Functions

The following examples illustrate usage of support functions for conditional numerical reproducibility.

Setting Automatically Detected CNR Branch

    PROGRAM MAIN 
    INCLUDE 'mkl.fi'
    INTEGER*4 MY_CBWR_BRANCH
C Find the available MKL_CBWR_BRANCH automatically
    MY_CBWR_BRANCH = MKL_CBWR_GET_AUTO_BRANCH()
C User code without Intel MKL calls
C Piece of the code where CNR of Intel MKL is needed
C The performance of Intel MKL functions might be reduced for CNR mode
    IF (MKL_CBWR_SET (MY_CBWR_BRANCH) .NE. MKL_CBWR_SUCCESS) THEN
        PRINT *, 'Error in setting MKL_CBWR_BRANCH! Aborting…'
        RETURN
    ENDIF
C CNR calls to Intel MKL + any other code
    END

Use of the mkl_cbwr_get Function

    PROGRAM MAIN
    INCLUDE 'mkl.fi'
    INTEGER*4 MY_CBWR_BRANCH
C Piece of the code where CNR of Intel MKL is analyzed
    MY_CBWR_BRANCH = MKL_CBWR_GET(MKL_CBWR_BRANCH)
    IF (MY_CBWR_BRANCH .EQ. MKL_CBWR_AUTO) THEN
C actions in case of automatic mode
    ELSE IF (MY_CBWR_BRANCH .EQ. MKL_CBWR_SSSE3) THEN
C actions for SSSE3 code
    ELSE
C all other cases
    ENDIF
C User code
    END

Optimization Notice
Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice. Notice revision #20110804

Optimization Notice

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804