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Cross module optimization

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This is a first version of cross module optimization (CMO).

The basic idea for CMO is to use the existing library evolution compiler features, but in an automated way. A new SIL module pass "annotates" functions and types with @inlinable and @usableFromInline. This results in functions being serialized into the swiftmodule file and thus available for optimizations in client modules.
The annotation is done with a worklist-algorithm, starting from public functions and continuing with entities which are used from already selected functions. A heuristic performs a preselection on which functions to consider - currently just generic functions are selected.

The serializer then writes annotated functions (including function bodies) into the swiftmodule file of the compiled module. Client modules are able to de-serialize such functions from their imported modules and use them for optimiations, like generic specialization.

The optimization is gated by a new compiler option -cross-module-optimization (also available in the swift driver).
By default this option is off. Without turning the option on, this change is (almost) a NFC.

rdar://problem/22591518
This commit is contained in:
Erik Eckstein
2019-11-21 14:04:53 +01:00
parent 0b6e3bf6f6
commit a5397b434c
15 changed files with 739 additions and 4 deletions
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1
lib/Frontend/CompilerInvocation.cpp
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@@ -871,6 +871,7 @@ static bool ParseSILArgs(SILOptions &Opts, ArgList &Args,
Opts.EnableARCOptimizations &= !Args.hasArg(OPT_disable_arc_opts);
Opts.EnableOSSAOptimizations &= !Args.hasArg(OPT_disable_ossa_opts);
Opts.DisableSILPerfOptimizations |= Args.hasArg(OPT_disable_sil_perf_optzns);
Opts.CrossModuleOptimization |= Args.hasArg(OPT_CrossModuleOptimization);
Opts.VerifyAll |= Args.hasArg(OPT_sil_verify_all);
Opts.DebugSerialization |= Args.hasArg(OPT_sil_debug_serialization);
Opts.EmitVerboseSIL |= Args.hasArg(OPT_emit_verbose_sil);