This is important in case the inline restarts the pass pipeline.
In a sub-sequent invocation of the inlined it should receive a cleaned-up function so that it can make better estimations for further inlining.
As a compensation, reduce the caller-block limit of the inliner.
And add an overall block limit which is also taken into account for always-inline functions.
Hoist alloc_stack instructions of 'generic' or resilient type to the entry
block. At the same time also perform a very simple stack coloring analysis.
This does not use a true liveness-analysis yet but rather employs some simple
conservative checks to see whether the live ranges of two alloc_stacks might
interfere.
AllocStackHoisting is an IRGen SIL pass. This allows for using IRGen's type
lowering information. Furthermore, hoisting and merging the alloc_stack
instructions this late does not interfere with SIL optimizations because the
resulting SIL never gets serialized.
This pipeline is run as part of IRGen and has access to the IRGenModule.
Passes that run as part of this pipeline can query for the IRGenModule.
We will use it for the AllocStackHoisting pass. It wants to know if a type is of
non-fixed size.
To break the cyclic dependency between IRGen -> SILOptimizer -> IRGen that would
arise from the SILPassManager having to know about the createIRGENPASS()
function IRGen passes instead of exposing this function dynamically have to add
themselves to the pass manager.
This enables one to dump the various passpipelines in a yaml format. Other
pretty print formats can be added in the future as well if desired. Its intended
usage is to provide a source of pass pipeline information for external python
bug-reducing tools. By integrating this as a compiler-tool, we are guaranteed to
never have to update any of these tools in the face of passpipeline changes.
This commit adds the functionality, but does not change SILPassManager to use
it. The reason why I am doing this is so I can implement sil-opt pass bisecting
functionality in python using a tool that dumps the current pass pipelines
out. This will ensure that even in the face of changes to the pass pipelines,
everything should just work.
