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Re: denormals/subnormals are heading for extinction
- To: crosby at qwes dot math dot cmu dot edu, dewar at gnat dot com
- Subject: Re: denormals/subnormals are heading for extinction
- From: dewar at gnat dot com
- Date: Thu, 16 Aug 2001 16:27:43 -0400 (EDT)
- Cc: gcc at gcc dot gnu dot org, trt at cs dot duke dot edu
<<I would like to add that even if denormals are usually encounted
infrequently enough that any ineffeciencies with them are minor, there is
still a big cost. Implementation complexity. Having to add and waste the
transistors to deal with them in the first place.
>>
Well modern chips have millions of transistors to waste these days, so
that is a weak argument at this stage.
<<If the gains and costs of denormals are neglegible, leave them out.
They're a headache you don't want to design for.
>>
But the gains are by no means negligible. Remember that this subject has
been duked out with substantial opposition from the hardware folks, and
the IEEE standard (remember IEEE is a group with substantial hardware
input) decided that denormals are worthwhile for good reasons. The fact
that Scott believes otherwise, without good documentation, is not very
convincing.