Quick compiler: restore optimizations
This CL re-enables optizations on the Quick compile path.
Notes:
o Although all optimization are enabled, several are now useless
because of llvm and bitcode constraints:
- Large method de-optimization (i.e. - skipping expensive dataflow
analysis) can't be done because we have to do the analysis to
produce a CFG that makes the bitcode verifier happy.
- Small method pattern matching isn't applicable w/ bitcode (though
I can probably do something similar in the Quick backend, but
looking for bitcode instead of dex patterns).
- Branch fusing doesn't translate to bitcode.
- Bitcode generation has de-optimized code layout. We'll try to
repair the damage in a subsequent CL.
o There is an ugly workaround related to the way we're loading and
unloading the compiler .so containing llvm. [See comment in compiler.cc]
o We're still running single-threaded - need to add the magic to allow
multi-threaded use of llvm.
o With the CL, the phone boots, all target tests pass and all cts VM
tests pass (except those being dealt with via a verifier change).
o Compile time is pretty bad - when flashing it's best to follow
with an adb sync to avoid on-device compilation of system apps.
Change-Id: I1c98f9e64aefbcbd24b957c71544c28450eb2023
8 files changed