#13376: Optional SPKG for SmallJac
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Reporter: pavpanchekha | Owner: tbd
Type: enhancement | Status:
needs_work
Priority: major | Milestone:
Component: optional packages | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers: R. Andrew
Ohana
Authors: Pavel Panchekha, Drew Sutherland | Merged in:
Dependencies: | Stopgaps:
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Comment (by leif):
W.r.t. the inline assembly: It shouldn't be too hard to port it to
non-x86_64 systems (probably by using potentially slow[er] C
implementations -- at the risk of making !SmallJac slower than other
implementations in Sage). (Most of the assembly, i.e., macros and inline
functions using `asm()`, is in `ff_poly-*/src/asm.h`; `cstd.h` also uses
`asm()` in two places, for the mentioned "high bit" and "low bit" inline
functions. For the latter two, one could presumably use GCC's more
portable `__builtin_*` -- at low or no expense -- as well.)
Unfortunately AFAICS the code also implicitly assumes that
`sizeof(unsigned long)==8` (instead of using `uint64_t` where
appropriate), which makes it pretty hard to port it to 32-bit systems (or
other systems on which that assumption is false).
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13376#comment:16>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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