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<TITLE>PetscSSEIsEnabled</TITLE>
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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</b></div>
<div id="bugreport" align=right><a href="mailto:petsc-maint@mcs.anl.gov?subject=Typo or Error in Documentation &body=Please describe the typo or error in the documentation: petsc-3.7.5 v3.7.5 docs/manualpages/Sys/PetscSSEIsEnabled.html "><small>Report Typos and Errors</small></a></div>
<A NAME="PetscSSEIsEnabled"><H1>PetscSSEIsEnabled</H1></A>
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.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#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)
</PRE>
Collective on <A HREF="../Sys/MPI_Comm.html#MPI_Comm">MPI_Comm</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<DT><B>comm </B> -the MPI Communicator
<br>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<DT><B>lflag </B> -Local Flag: <A HREF="../Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A> if enabled in this process
<br>
<DT><B>gflag </B> -Global Flag: <A HREF="../Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A> if enabled for all processes in comm
<br>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
NULL can be specified for lflag or gflag if either of these values are not desired.
<P>
<H3><FONT COLOR="#CC3333">Options Database Keys</FONT></H3>
<DT><B>-disable_sse </B> -Disable use of hand tuned Intel SSE implementations
<br>
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>developer
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/sys/utils/sseenabled.c.html#PetscSSEIsEnabled">src/sys/utils/sseenabled.c</A>
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