Re: Regarding retrieving source from modules

[boldt@xxxxxxxxxx]

Jim wrote:
>I know in the PC world, anyway, if I optimize something, I can loose some
>debug info.  That is, if it optimizes 3 lines of code into one line of
ASM,
>in this case MI I guess, then when debugging things don't step along as
>they should.
>
>So, does the RPG compiler optimize the executable?  Or is that either not
>possible, or an additional step I need to perform?  If the RPG compiler
>doesn't optimize my code, then it is a non issue and I can go ahead and
>compile with *ALL (since there is practically no size increase over
*LIST).

The optimization is done  by the common back-end used by
all AS/400 compilers.  The optimizer is quite aggressive
and can make a difference in compute-bound applications,
especially those written in C.

RPG semantics, however, limit the amount of optimization
that  are possible.  This normally isn't that big a deal
anyways since most RPG apps are I/O-bound,  not compute-
bound.   Since the most  aggressive optimizations  don't
apply to most RPG programs,  debugging is  not too badly
affected by the optimizations.

Cheers!  Hans

Hans Boldt, ILE RPG Development, IBM Toronto Lab, boldt@ca.ibm.com


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