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Document DESC%CNV method and MOLD arguments to CDASB and PREC%BUILD

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Salvatore Filippone
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<TITLE>psb_sum -- Global sum</TITLE>
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<TITLE>psb_bcast -- Broadcast data</TITLE>
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<H2><A NAME="SECTION000810000000000000000">
psb_sum -- Global sum</A>
<H2><A NAME="SECTION00089000000000000000">
psb_bcast -- Broadcast data</A>
</H2>
<P>
<PRE>
call psb_sum(icontxt, dat, root)
call psb_bcast(icontxt, dat, root)
</PRE>
<P>
This subroutine implements a sum reduction operation based on the
This subroutine implements a broadcast operation based on the
underlying communication library.
<DL>
<DT><STRONG>Type:</STRONG></DT>
@@ -83,7 +80,7 @@ Intent: <B>in</B>.
Specified as: an integer variable.
</DD>
<DT><STRONG>dat</STRONG></DT>
<DD>The local contribution to the global sum.
<DD>On the root process, the data to be broadcast.
<BR>
Scope: <B>global</B>.
<BR>
@@ -92,14 +89,11 @@ Type: <B>required</B>.
Intent: <B>inout</B>.
<BR>
Specified as: an integer, real or complex variable, which may be a
scalar, or a rank 1 or 2 array. Type, kind, rank and size must agree on all processes.
scalar, or a rank 1 or 2 array, or a character or logical variable,
which may be a scalar or rank 1 array. Type, kind, rank and size must agree on all processes.
</DD>
<DT><STRONG>root</STRONG></DT>
<DD>Process to hold the final sum, or <IMG
WIDTH="24" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
SRC="img78.png"
ALT="$-1$"> to make it available
on all processes.
<DD>Root process holding data to be broadcast.
<BR>
Scope: <B>global</B>.
<BR>
@@ -108,12 +102,12 @@ Type: <B>optional</B>.
Intent: <B>in</B>.
<BR>
Specified as: an integer value <!-- MATH
$-1<= root <= np-1$
$0<= root <= np-1$
-->
<IMG
WIDTH="165" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
SRC="img132.png"
ALT="$-1&lt;= root &lt;= np-1$">, default -1. </DD>
<SPAN CLASS="MATH"><IMG
WIDTH="153" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
SRC="img131.png"
ALT="$0&lt;= root &lt;= np-1$"></SPAN>, default 0 </DD>
</DL>
<P>
@@ -122,7 +116,7 @@ Specified as: an integer value <!-- MATH
<DD>
</DD>
<DT><STRONG>dat</STRONG></DT>
<DD>On destination process(es), the result of the sum operation.
<DD>On processes other than root, the data to be broadcast.
<BR>
Scope: <B>global</B>.
<BR>
@@ -131,49 +125,12 @@ Type: <B>required</B>.
Intent: <B>inout</B>.
<BR>
Specified as: an integer, real or complex variable, which may be a
scalar, or a rank 1 or 2 array.
<BR>
Type, kind, rank and size must agree on all processes.
scalar, or a rank 1 or 2 array, or a character or logical scalar. Type, kind, rank and size must agree on all processes.
</DD>
</DL>
<P>
<FONT SIZE="+1"><B>Notes</B></FONT>
<OL>
<LI>The <code>dat</code> argument is both input and output, and its
value may be changed even on processes different from the final
result destination.
</LI>
<LI>The <code>dat</code> argument may also be a long integer scalar.
</LI>
</OL>
<P>
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