[TCLCORE] modifying generic/tclExecute.c

[<Miguel S. <mi...@ut...>]

I am testing a few optimisations of TclExecuteByteCode, with
initially promising results.

It consists mainly of
(a) avoiding calls outside of TclExecuteByteCode and reducing the
    amount of recursive calls
(b) using (if available) the gcc "Labels as Values" extension,
    making a single indirect jump to the new opcode instead of a jump 
    back to "for (;;)" and then switch (an indirect jump as compiled by
    gcc) 
(c) a few other smaller things 

Point (a) implies inlining some code which is in other files
(tclVar.c, tclBasic.c, maybe tclCompile.c). I have been "copying and
pasting" in my preliminary tests, but realise that this is not very
good - difficult maintenance, even if well documented. For instance,
any change in the Var type may have severe implications in the
executor, the decoupling is lost ...

A solution might be to put some of that code in macros in a common
header file. I kind of liked the idea of touching a single file
(actually, a single function!); this option would imply modifying also
the other files ... and maybe making life difficult for their
maintainers/updaters. I'd rather not ...

I appreciate any suggestions you might have on this point.

Thanks

Miguel Sofer

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