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    • Schuyler Eldridge's avatar
      Add SparseVec · e3bcc90d
      Schuyler Eldridge authored
      
      
      Add a new utility, SparseVec.  This exposes a normal Vec-like dynamic
      access API.  However, the dynamic access is implemented one of three ways:
      
        1. Using a binary decoder
        2. Using a one-hot decoder
        3. Using when statements
      
      This is added to better support a design pattern ("vec--decoder pattern")
      where a large, sparse vector is used to describe a decoder.  This pattern,
      if unchecked and used in a parametric generator, can cause the vector to
      grow extremely large and cause backend tools to complain.
      
      Specifically, Cadence tooling is known to set limits on the addressable
      range of a "memory" and will error if these are exceeded.  This
      vec--decoder pattern can easily exceed this if designers are not careful.
      
      Signed-off-by: default avatarSchuyler Eldridge <schuyler.eldridge@sifive.com>
      e3bcc90d
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