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From: torek@elf.ee.lbl.gov (Chris Torek)
Newsgroups: comp.arch
Subject: how big are the queues on the SPARC floating point units?
Message-ID: <11022@dog.ee.lbl.gov>
Date: 16 Mar 91 13:49:50 GMT
Followup-To: comp.arch
Organization: Lawrence Berkeley Laboratory, Berkeley
Lines: 12
X-Local-Date: Sat, 16 Mar 91 05:49:51 PST

The SPARC documentation describes the FP queue as `one or more 64 bit
[values]' and also says that there will be at least one entry per
`parallel functional unit'.  It puts no architectural limit on the
queue length.  I need to be able to save these queues across context
switches and signals, however, so I to know how much space to
allocate.  The larger this is, the more expensive signal handling
becomes (although I can, and will, alleviate the problem somewhat for
processes that are not doing FP work; but I still need to allocate
space for this).
-- 
In-Real-Life: Chris Torek, Lawrence Berkeley Lab CSE/EE (+1 415 486 5427)
Berkeley, CA		Domain:	torek@ee.lbl.gov