#13352: Running time improvement of the bitset_len method
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Reporter: dcoudert | Owner: jason
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.12
Component: misc | Resolution:
Keywords: | Merged in:
Authors: David Coudert | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by dcoudert):
Hello,
after browsing the web, I came up with this new version. The current
version tests is the cpu has builtin support. If yes, we use builtin
version. Else, we use hakmem methods.
* http://gcc.gnu.org/onlinedocs/gcc/X86-Built_002din-Functions.html
* http://gcc.gnu.org/gcc-4.8/changes.html
* http://www.spinics.net/lists/linux-ext4/msg35827.html
We don't need all the methods for {{{bitset_len}}} but it could be useful
for other usage.
Let me know if it is OK.
--
Ticket URL: <http://trac.sagemath.org/ticket/13352#comment:10>
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