RE: "MI" of ILE programs

["Hans Boldt" <hboldt@xxxxxxxxxxxx>]

Wiesmayr Rudolf <Rudolf.Wiesmayr@mag.linz.at> wrote:
>OK. But I want to have any chance to examine my bottleneck routine.
>There are cases where a short look at the generated code should make clear
>if there is a chance for a better algorithm. When I see a single instruction
>(and I heard of very powerful instructions doing a lot of things deep down in
>the machine) instead of a long sequence I'd not try to reformulate the HLL
>code and go concerning the next possibility...

I know exactly what you mean.  But, these days, optimizing back-ends
are good - damn good in fact.  What it means is that when using high
optimization, the final machine code bears little resemblance to the
original source code.  It may not be possible to determine exactly
what sequence of machine instructions corresponds to a particular
HLL statement.

Cheers!  Hans

Hans Boldt, ILE RPG Development, IBM Toronto Lab, hboldt@vnet.ibm.com

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