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fast io, number conversions, etc.
- To: firstname.lastname@example.org
- Subject: fast io, number conversions, etc.
- From: bright@ENH.NIST.GOV
- Date: 04 Nov 1992 15:49:40 -0500
Any pointers to, or new code for these sorts of things?
1. Fast file I/O. especially for arrays or long vectors. Perhaps block
moves (a la Pascal?).
2. Conversion of numbers (such as a VAX FORTRAN real*4) read into MCL from
a file as bytes with (read-byte). (VAX FORTRAN has the rather scuzzy but
useful capability to equivalence a byte array to a real number, which is
expressly forbidden with (make-array ... :displaced-to ...). It's the
replacement for this type of think that I'm looking for - take 4 bytes and
munge them into a floating point number.)
3. A collection of useful declarations that speed up commonly used
operations on arrays of numbers, eg: (slow code with no declarations),
(fast code with spiffy declarations), comments on speedup. An example of
what I have in mind would be adding two integer arrays (such as images) to
get a third, element by element -- this typically uses lots of overhead in
calculating the indices.
Any help is appreciated.
David S. Bright email@example.com
Microanalysis Research Group
National Institute of Standards & Technology (NBS)
Gaithersburg, MD 20899