[LLVMdev] Tail calls (TCO) in PNaCL | PNaCl Bitcode reference manual

[JF Bastien]

> That'd be ideal, yes.  When the client runs llc, is it going to run it
> at a fixed or client determined optimization level or one specified by
> metadata that follows the code?

You mean for PNaCl? The developer can run LLVM's optimizations on his
machine and generate a pexe. The pexe and manifest are then served to
users, and this manifest specifies which optimization level to use to
translate the pexe to a nexe on user's devices.

You can therefore choose between SelectionDAG and FastISel (fast code or
fast translation) on the user's device without giving up all performance
because the non-target-specific optimizations have been executed already.

This is something that we've benchmarked fairly closely and plan to
improve.
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