Fastcomp (the new fast compiler core for emscripten,
https://github.com/kripken/emscripten/wiki/LLVM-Backend ) is close to
completion. Recent new features ported from the original compile include
the exceptions whitelist (EXCEPTION_CATCHING_WHITELIST, important for
JSMESS for example) and precise float32 (PRECISE_F32). That almost
completes the list of necessary features, except for 2 things: indirect
branches, and dlopen support. When those are in place, and all the test
suite passes and no issues are filed on fastcomp, we can switch.

So we hope to enable fastcomp by default in the next few months. Please
test it on your codebase (instructions on the wiki page linked to above)
and report issues if you see any, to make the transition easier when we
switch to it. (The original compiler will remain as an option, though.)

- Alon

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