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RE: DPD vs. BID hardware
John Crawford wrote on Fr 23.06.2006 16:50:
No, Michel, everyone does not agree that DPD is more hardware-friendly
than BID.
We, as an independent Software vendor, came to
the conclusion after one year investigation on
the issue, that DPD Is more Intel and AMD HW
friendly format than BID for the reasons I
posted previously.
- Nobu
I got a couple of off line comments on my statement.
I therefore wish to answer the questions here.
The subject of our discussion is an industry
standard. The standardization is successful,
when the industry implement the standard broadly.
There exist DPD implementations, which are available.
We have verified the existing DPD implementations,
and confirmed the value of DPD format, quality and
performance of the existing implementation for broad
applications.
The situation for BID is, that there exists no
implementation which is available. We have done the
feasibility study for the BID claims, and we so far
cannot verify the claims. There are many issues, but:
1) lack of 128 bit register in Intel and AMD CPUs.
2) nature of the binary encoding format
- toilsome rounding at particular decimal
positions
- inefficient extraction of particular decimal
positions
- etc
are the major reasons, why we assume that BID is not
suitable for decimal applications.
The absence of evidence should be in this case
interpreted as an evidence of absence - that BID
claims failed.
Now considering the above facts, DPD is ready to be
standardized, while we first should request the
proponent of BID to present some evidence in form
of implementation before we can standardize BID.
But I also agree to the position, that BID claims
can be fulfilled some day, therefore BID can be
standardized today as one of non data exchange
formats.
- Nobu