#8096: Speed up parent creation for multiplication of square matrices
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Reporter: boothby | Owner: boothby
Type: enhancement | Status: needs_info
Priority: minor | Milestone:
Component: linear algebra | Keywords:
Work_issues: various doc test errors | Upstream: N/A
Reviewer: | Author: boothby, robertwb
Merged: | Dependencies:
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Comment(by SimonKing):
Replying to [comment:31 malb]:
> correct link:
http://martinralbrecht.files.wordpress.com/2011/03/20110330_-_m4ri_-_nancy1.pdf
Thank you!
> What does "two marks per byte" mean?
Sorry, where's my head? For field size 64, only one mark per byte is used,
and it is [xxxxxx00][xxxxxx00].
Meataxe packs as many field elements into a single byte as possible.
Hence, if you work over GF(5) then a triple of field elements will be
packed into one byte. That is since 5^3^ is smaller than 256, but 5^4^ is
bigger.
So, really quite simplistic. No bit slicing or anything fancy.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8096#comment:33>
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