2014_MeetingOctober2 < P1076

P1076 Web>Vhdl2019MeetingMinutes>2014_MeetingOctober2 (2020-02-17, JimLewis) (raw view)EditAttach
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---+!! P1076 October 2, 2014 Meeting Minutes
---++!! Attendees:
   * Main.PeterFlake * Main.CliffordWalinsky * Main.MartinThompson * Main.JimLewis * Main.StevenDovich * Main.RyanHinton * Main.DavidBishop
---++!! Agenda:

%TOC%

---++ Action Item Review

*Meeting Discussion*
   * Done: Peter: Subtypes and Functions - add issues from previous meeting to proposals- in progress
   * Jim: Package based implementation of mod (record with modulus and integer value) - in progress
   * Martin: Integers and Logic Operators - in progress
   * Jim: Add warning to ?? on meta value
   * Trace back information from warning in package (such as numeric_std) to line number in entity that caused it. 
      * VHPI has this information.
      * 'instance_name does not work since it goes through the library rather than the call stack
      * Define stack trace to be a string produced by VHPI full name
      * Could be a standard DPI library to call VHPI applications.
   * Jim: Prepare ranking sheet
   * Martin: BigNum Proposal 
      * A BigNum library type based on integer_vector (or other array type) cannot be used in for loops or indcies of arrays, where as a built in type potentially could.
      * Addressing a large RAM or disk drive in simulation.
      * What type of uses are BigNums used for: Are indexing and looping important?
      * How do you express a literal for a BigNum? As a string value or as an Universal Integer?
      * Python integer type is BigNum and uses regular integer values
      * Java has a BigNum package and uses string values or arrays of bytes
      * see: [[http://en.wikipedia.org/wiki/Arbitrary-precision_arithmetic][Wikipedia Arbitrary Precision Arithmetic]]
      * BigNum libraries are typically dynamically sized.
      * Integer_vector would not allow for dynamic sizing
      * Want to be able to either constrain an object or not - with a range constraint
      * In simulation a BigNum can be unconstrained
      * BigNum'high and 'low will error or return a value if the object is unconstrained
      * Will need something like ieee.math_real to help translate between BigNum
      * Should conversions between BigNum and Integer be implicit or explicit (type conversion like integer and real)? 
         * Implicit conversions may cause issues with package overloading
   * Arbitrary width real: see [[2012_MeetingNovember8][Nov 8 2012 meeting]] 
      * Arbitrary width reals? Not built into any language.
      * IEEE 754-2006 allows for arbitrary width float
      * Currently real is a double and this is ok.
   * Tabled - Multi dimensional Array restructuring: Array &lt;--&gt; Matrix Transformations [[2012_MeetingJuly19]] [[MeetingDecember15]] 
      * Matlab has built-in reshape functions
      * In VHDL - explicit vs implicit defined operator
      * David Bishop: Requiring an implicit operator could delay implementations
      * Can this be handled by anonymous types on interfaces or generics on a package?
      * Language facility for creating implicit operators?
   * Ryan - Slicing Multidimensional Arrays (FT15) maybe related to above [[2012_MeetingMay24]]
   * Jim - Mark bugzillas for which we have a proposal with that status
   * Jim - Table driven modeling via protected types [[2012_MeetingMay10]]
   * Steven: P1735 submitted to RevCom. VHDL work ready to start
---++ Ranking Criteria
   * Rank based on need 
      * Item needs to be fixed
      * Useful for an application
   * Rank based on complexity 
      * How hard to implement
   * Noted several items in Collected Requirements as Must Do
   * AI: Jim: Create ranking sheet.
---++ Review and Approve Meeting Minutes:
   * Motion: Steven 2nd: Cliff
---++ Next Meeting: Thursday [[2014_MeetingOctober16][October 16, 2014]] 8 am Pacific
---+++ Previous Meeting: Thursday [[2014_MeetingSeptember 25][September 25, 2014]]
Topic revision: r3 - 2020-02-17 - 15:36:14 - JimLewis
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