petsc-3.6.2 2015-10-02
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# PetscSSEIsEnabled

Determines if Intel Streaming SIMD Extensions (SSE) to the x86 instruction set can be used. Some operating systems do not allow the use of these instructions despite hardware availability.

### Synopsis

    #include "petscsys.h"
    static PetscBool petsc_sse_local_is_untested  = PETSC_TRUE;
    static PetscBool petsc_sse_enabled_local      = PETSC_FALSE;
    static PetscBool petsc_sse_global_is_untested = PETSC_TRUE;
    static PetscBool petsc_sse_enabled_global     = PETSC_FALSE;
    PetscErrorCode  PetscSSEIsEnabled(MPI_Comm comm,PetscBool  *lflag,PetscBool  *gflag)

Collective on MPI_Comm

### Input Parameter

comm -the MPI Communicator

### Output Parameters

lflag -Local Flag: PETSC_TRUE if enabled in this process
gflag -Global Flag: PETSC_TRUE if enabled for all processes in comm

### Notes

NULL can be specified for lflag or gflag if either of these values are not desired.

### Options Database Keys

-disable_sse -Disable use of hand tuned Intel SSE implementations

Level:developer
Location: src/sys/utils/sseenabled.c
Index of all Sys routines
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Index of all manual pages