percent codes for analyses (was: Feb 8 2007 minutes)

Martin O'Leary wrote:
> 
> * Add percentage codes for analysis that can be used to uniquely name a
> file generated by an analysis.
> It a file is not uniquely name, it will be overwritten if there are
> multiple analysis opening, closing and writing to the file.

Let's be sure that SV is going to go along with this; there are
only 26 percent codes, and most of them are already used.  We
don't want SV to assign a different meaning.

What does this code look like?  If I put "results_%a" to I get
files like "results_dc" "results_ac" ...

Or are the names more like the temporary filenames generated
by the C function "tmpnam"?

On one hand, it would be nice to know that dc results are in
"results_dc"; on the other, I don't want the results of the
second dc analysis in a single netlist to overwrite those
of the first dc analysis.

Some simulators have names for the analysis, eg "dc1" in this:
dc1 dc start=0 stop=5
Will the percent code use this name?  On one hand, this would
give good control to the user; on the other hand, it may be
inappropriate to dictate this for the simulator in an HDL
manual.

-Geoffrey


Codes used in Verilog 1364-2005:
b,c,d,e,f,g,h, ,l,m, ,o, ,s,t,u,v, ,z

C uses i,n,p,x in some implementations, though %i looks
to the same as %d; %x is "unsigned hex" in C, whereas
%h is "hex" in Verilog.  Also, %u is "unsigned decimal"
in C, but "unformatted 2-value" in Verilog.  (%p is for
a pointer. %n is strange: printf outputs nothing but
instead stores back into the corresponding argument the
number of characters printed so far.)

I don't see any new ones in 1800-2005.  AMS uses %r.

That leaves: a,j,k,q,w,y  %a sure would be nice for
analysis ...

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