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<TITLE>PetscSSEIsEnabled</TITLE>
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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</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-3.14.5 v3.14.5 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 <A HREF="../Sys/PetscBool.html#PetscBool">PetscBool</A> petsc_sse_local_is_untested = <A HREF="../Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A>;
static <A HREF="../Sys/PetscBool.html#PetscBool">PetscBool</A> petsc_sse_enabled_local = <A HREF="../Sys/PETSC_FALSE.html#PETSC_FALSE">PETSC_FALSE</A>;
static <A HREF="../Sys/PetscBool.html#PetscBool">PetscBool</A> petsc_sse_global_is_untested = <A HREF="../Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A>;
static <A HREF="../Sys/PetscBool.html#PetscBool">PetscBool</A> petsc_sse_enabled_global = <A HREF="../Sys/PETSC_FALSE.html#PETSC_FALSE">PETSC_FALSE</A>;
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../Sys/PetscSSEIsEnabled.html#PetscSSEIsEnabled">PetscSSEIsEnabled</A>(<A HREF="../Sys/MPI_Comm.html#MPI_Comm">MPI_Comm</A> comm,<A HREF="../Sys/PetscBool.html#PetscBool">PetscBool</A> *lflag,<A HREF="../Sys/PetscBool.html#PetscBool">PetscBool</A> *gflag)
</PRE>
Collective
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>comm </B></TD><TD>- the MPI Communicator
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>lflag </B></TD><TD>- Local Flag: <A HREF="../Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A> if enabled in this process
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>gflag </B></TD><TD>- Global Flag: <A HREF="../Sys/PETSC_TRUE.html#PETSC_TRUE">PETSC_TRUE</A> if enabled for all processes in comm
</TD></TR></TABLE>
<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>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-disable_sse </B></TD><TD>- Disable use of hand tuned Intel SSE implementations
</TD></TR></TABLE>
<P>
<P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>developer<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/sys/utils/sseenabled.c.html#PetscSSEIsEnabled">src/sys/utils/sseenabled.c</A>
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