Re: Interested about number crunching in Ada

[development-2006-8ecbb5cc8aREMOVETHIS@ANDTHATm-e-leypold.de (Markus E.L. 2)]

'anon AT anon DOT org (anon)' wrote:

> As for GNAT converting Ada to C.  Try looking at a number of papers 
> of the net on GNAT Ada and also how to write a Frontend compiler for 
> gnu's gcc c compiler.  Also, for a direct proof take a look at the C coded 
> procedure called 'gigi' in file "trans.c" in GCC-4.x Ada source packages.  
> The 'gigi" procedure is called from the procedure "Call_Back_End" in 
> file "Back_End.adb". Gnat uses it converts the C (ada tree) tree and 
> generates the assembly code and finally the object code. This is the 
> structure of all GCC type compilers that use GCC as a backend.  And 
> there are a number of papers at GNU on this.


Does the expression "intermediate representation" or "intermediate
code" convey any meaning to you?

>>- F2A is not a Fortran preprocessor for using Ada as the back end; you use it
>>once and forget the Fortran code, and continue developing the Ada source.
>>At the end, you have one step. Sorry...
>
> I guess you have never tried to increase a codes performance. To prove 
> each step you must start with the original code every time.  In the F2A 
> that is, the FORTRAN code.  And sometime to increase a codes 
> performance you may need to alter the FORTRAN code which has some 
> documentation and then test it, first. Because for functionally 
> both the FORTRAN and Ada codes must yield the correct results.  
> Both in performance and output.

What ist so difficult about "forget"? Forget as in "throw away" ...

- M