RE: [sv-bc] part-select terminology

This is now Mantis 2169 and I have attached the proposal.
 
Shalom


________________________________

	From: owner-sv-bc@server.eda.org
[mailto:owner-sv-bc@server.eda.org] On Behalf Of Bresticker, Shalom
	Sent: Wednesday, October 31, 2007 11:16 AM
	To: sv-bc@server.eda.org
	Subject: [sv-bc] part-select terminology
	
	

	Hi, 

	At the last meeting, we talked a little about the terminology of
part-selects in the LRM. I looked at this a little. It turns out that
the situation is more easily fixed than I feared.

	There are two types of part-selects: 

	[m:n], where m and n must be constants. This is defined as a
'constant part-select' in 11.5.1, but that term with that meaning is
only used in a few places in the LRM.

	[m:+n],[m-:n], where n must be constant, and m need not be. This
is consistently called an 'indexed part-select'. 

	In most places, only the term 'part-select' is used, because in
most places, both forms can be used. 

	I'll write a proposal which changes the [m:n] form to be a
'fixed part-select', because I think it needs a name. This frees the
term 'constant part-select' to be either form, where both m and n are
constants. A fixed part-select is always constant. An indexed
part-select may be so or not. This makes the term 'constant part-select'
be parallel to 'constant bit-select' and 'constant select'.

	I don't want to use the term 'variable part-select' to refer to
an indexed part-select where m is not a constant, because that term
refers to the part-select of a variable.

	Shalom Bresticker 
	Intel Jerusalem LAD DA 
	+972 2 589-6852 
	+972 54 721-1033 

	
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