Re: int vs binary questions -- RPG400-L

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cozzi@xxxxxxxxx wrote:

Hans, That's all well and good, but... 1) Why is DDS limited to 2 and 4 byte binaries and seems to use the RPG-like declaration for them (or has that changed?) 2) Why would the timing of int->int copy be slower than Bin->Bin in RPG IV as was reported here earlier today?

1) DDS is NOT limited to 2 and 4 byte binaries. DDS also supports 8 byte binaries.

2) Why did Steve report faster timings on bin->bin copy compared to int->int copy? First, on a simple "EVAL B1=B2;" copy from binary to binary where both variables have the same size, no conversion happens. In W-Code, we do just a LOD and STR. For an assignment "EVAL I1=I2;", it actually is a little bit more complicated. If I1 and I2 are defined as 20I0, there's a LOD and STR which runs at around the same speed as the binary. However, if the source argument is not 20I0, the compiler emits a "convert to 8-byte integer" instruction first, and that tends to slow things down a little bit. The performance difference disappears with optimization, however.

Cheers! Hans

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