specialize on polymorphic arguments.
This can be enabled with: -sil-devirt-threshold 500.
It currently improves RC4 (when enabled) by 20%, but will be much more
important after Michael's load elimination with alias analysis lands.
This implementation is suitable for experimentation. Superficial code
reviews are also welcome. Although be warned that the design is overly
complex and I plan to rewrite it. I initially abandoned the idea of
incrementally specializing one function at a time, thinking that we
need to analyze full chains. However, I since realized after talking
to Nadav that the incremental approach can be made to work. A lot of
book-keeping will go away with that change.
TODO:
- Resolve protocol argument types. Currently we assume they can be
reinitialized at applies, but I don't think they can unless they are
@inouts. This is an issue with the existing local devirtualizer
that prevents it working across calls.
- Properly mangle the specialized methods. Find existing
specializations by demangling rather than maintaining a map.
- Rewrite the logic for specializing chains for simplicity.
- Enable by default.
Swift SVN r13642
Part of the migration to the new driver. With this commit, the only
failures in the test suite using the new frontend are features we don't
intend to port over. Hooray!
Swift SVN r13198
SILSerializeAll and EmitVerboseSIL are /not/ being moved because they are
options controlling the output, not about SILGen and SIL passes.
No functionality change.
Swift SVN r13197
Plumbing this through to the inliner necessitated the creation of a
SILOptions class (like FrontendOptions and IRGenOptions). I'll move
more things into this soon.
One change: for compatibility with the new driver, the option must be
specified as "-sil-inline-threshold 50" instead of "-sil-inline-threshold=50".
(We're really trying to be consistent about joined-equals vs. separate
in the new frontend.)
Swift SVN r13193
