* [SILOpt] Allow pre-specializations for _Trivial of known size
rdar://119224542
This allows pre-specializations to be generated and applied for trivial types of a shared size.
NOTE: I changed all places that the CastOptimizer is created to just pass in
nullptr for now so this is NFC.
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Right now the interface of the CastOptimizer is muddled and confused. Sometimes
it is returning a value that should be used by the caller, other times it is
returning an instruction that is meant to be reprocessed by the caller.
This series of patches is attempting to clean this up by switching to the
following model:
1. If we are optimizing a cast of a value, we return a SILValue. If the cast
fails, we return an empty SILValue().
2. If we are optimizing a cast of an address, we return a boolean value to show
success/failure and require the user to use the SILBuilderContext to get the
cast if they need to.
With this change and some other changes that I am committing in parallel, the
stdlib and all of the overlays send all proper pass manager notifications.
rdar://42301529
To do so this commit does a few different things:
1. I changed SILOptFunctionBuilder to notify the pass manager's logging
functionality when new functions are added to the module and to notify analyses
as well. NOTE: This on purpose does not put the new function on the pass manager
worklist since we do not want to by mistake introduce a large amount of
re-optimizations. Such a thing should be explicit.
2. I eliminated SILModuleTransform::notifyAddFunction. This just performed the
operations from 1. Now that SILOptFunctionBuilder performs this operation for
us, it is not needed.
3. I changed SILFunctionTransform::notifyAddFunction to just add the function to
the passmanager worklist. It does not need to notify the pass manager's logging
or analyses that a new function was added to the module since
SILOptFunctionBuilder now performs that operation. Given its reduced
functionality, I changed the name to addFunctionToPassManagerWorklist(...). The
name is a little long/verbose, but this is a feature since one should think
before getting the pass manager to rerun transforms on a function. Also, giving
it a longer name calls out the operation in the code visually, giving this
operation more prominance when reading code. NOTE: I did the rename using
Xcode's refactoring functionality!
rdar://42301529
I am going to add the code in a bit that does the notifications. I tried to pass
down the builder instead of the pass manager. I also tried not to change the
formatting.
rdar://42301529
