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On 2012/9/16 2:05 PM, Rory Hewitt wrote:
1. Is there any difference between what is generated at a low-level (W-code
or whatever) for "A = A + B" and "A += B"? I assume not, and that the
difference is merely in the RPG, but I don't know whether the compiler can
make any optimization based on the second example.
The compiler doesn't make any optimizations other than only evaluating A
once.
There's a possible optimization that the compiler could make, but
doesn't: it currently builds the value A + B and then assigns it to A,
but ideally, it would simply append B to the end of A.
The reason that it doesn't is a resource/priority issue. Adding += for
strings as it was implemented was relatively low-cost, but making it do
a true append for strings would be quite costly in terms of resource.
So, currently, the main benefit (and it's not a small benefit) of the
short-form assignment operators is maintainability and readability of code.
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